CN114016372A - Suspension bridge resetting energy-consuming type central buckle and design and use method thereof - Google Patents
Suspension bridge resetting energy-consuming type central buckle and design and use method thereof Download PDFInfo
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- CN114016372A CN114016372A CN202111088586.8A CN202111088586A CN114016372A CN 114016372 A CN114016372 A CN 114016372A CN 202111088586 A CN202111088586 A CN 202111088586A CN 114016372 A CN114016372 A CN 114016372A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The invention provides a suspension bridge resetting energy-consuming type central buckle and a design and use method thereof. The lead-free friction plate comprises an inner core, a ring spring component, a lead damping component, an inner pipe, a friction plate, an outer pipe, a bolt, a sealing ring and a sealing strip. The friction plate is connected with the lead damping part in parallel and then connected with the ring spring in series. The inner core is located the device axis, and inner core left side end is equipped with the hinge hole, and outside the inner core was located to the inner tube cover, the end of inner tube right side was equipped with the hinge hole equally, both ends hinge hole for with external connection. The friction plate is fixed on the inner wall of the outer pipe, the outer pipe is sleeved outside the inner pipe, bolt holes are uniformly reserved at the flange position of the outer pipe, and the bolt holes are used for connecting the two semicircular outer pipes. The energy consumption is simultaneously carried out through the shearing action of the lead damping part and the friction action of the friction plate, and the energy consumption performance is stable; the self-resetting function of the device is realized through the ring spring part, so that the residual displacement of the structure is effectively reduced. The invention completes the fixing and connection of parts by the grooves and the bolts, and is installed in an external hinged and series structure form, thereby facilitating the maintenance of internal components of the device and the replacement of damaged components in the later period and having higher economical efficiency.
Description
Technical Field
The invention relates to the technical field of suspension bridges, in particular to a suspension bridge resetting energy-consuming type central buckle and a design and use method thereof.
Background
And (4) buckling the center: the component of main cable and stiffening beam of department in connecting suspension bridge span is used for improving the structure integral rigidity, reduces the relative displacement of main cable and stiffening beam.
And (4) ring spring: the annular spring is a compression type spring formed by assembling an inner ring and an outer ring of steel rings with conical surfaces, and is mainly characterized in that the inner ring and the outer ring are assembled, so that the annular spring is convenient to disassemble, assemble and replace, only slightly deforms under the action of high load, and has great rigidity. The restoring force can be provided for the structure, the residual displacement of the structure is reduced, and the self-resetting function is realized.
The suspension bridge is a flexible structure, under the action of train, earthquake and wind load, the stiffening beam and the main cable will produce longitudinal and transverse displacement, and when the stiffening beam and the main cable produce relative displacement, the suspension cable will be bent. In order to improve the phenomenon, a central buckle is required to be additionally arranged in the midspan area of the suspension bridge. The currently common central buckle types mainly comprise a rigid central buckle, a flexible central buckle and an energy-consuming central buckle, wherein the rigid central buckle adopts a rigid triangular truss to connect a main cable with a stiffening beam, and the cable beam is relatively fixed in the midspan due to the higher rigidity of the rigid truss; the flexible central buckle adopts a stay cable to connect the main cable with the stiffening beam so as to complete the longitudinal restraint of the cable beam; the energy-consuming type central buckle is usually made of a buckling-restrained brace, and a core component of the energy-consuming type central buckle is made of low-yield-point steel, so that the double functions of restraining, limiting, energy dissipating and shock absorbing can be realized.
Although the rigid central buckle and the flexible central buckle can improve the rigidity of the bridge and inhibit the relative displacement between the stiffening beam and the main cable, the rigid central buckle and the flexible central buckle are easy to damage due to overlarge stress of the rod piece under the action of strong shock, and although the energy-consuming central buckle can solve the problems, the energy-consuming central buckle is single in energy-consuming form, and the energy-consuming capability and the stability are still required to be improved. The central buckles have no self-resetting capability, and the residual displacement of the suspension bridge under various loads cannot be effectively controlled; and the central button form is mostly integral, and after some parts appear damaging, need whole changes, easily causes the waste. Therefore, the central buckle with the composite energy consumption form and the self-resetting function is of great significance.
Disclosure of Invention
The embodiment of the invention provides a suspension bridge resetting energy-consuming type central buckle and a design and use method thereof, and aims to solve the problems that the current central buckle is single in energy-consuming form, limited in energy-consuming capability, lack of self-resetting function, high in replacement difficulty and the like.
In order to achieve the purpose, the invention adopts the following technical scheme.
According to an aspect of the present invention, a suspension bridge energy dissipating reset center buckle comprises: two energy consuming components: friction plate and lead damping component, and a self-resetting functional component: and the friction plate is connected with the lead damping part in parallel and then connected with the ring spring part in series.
Preferably, the suspension bridge energy dissipation type central buckle that resets further includes: inner core (1), inner core (1) are located the device axis, the left side end of inner core (1) is equipped with hinge hole (8) for whole device is connected with external structure, inner core (1) is solid circular rod iron, and inner core (1) sets up outer tube spacing recess (10), the spacing recess of a plurality of plumbous damping part (11) and the spacing recess of a ring spring part (12) from a left side to the right side for place and restrain and correspond the part.
Preferably, suspension bridge energy dissipation type central authorities that reset detain still include inner tube (2), the right side end of inner tube (2) is provided with hinge hole (9) that are used for whole device and external being connected, inner tube (2) are two semi-circular steel pipes, and the inner wall sets up the recess of a certain amount, is the spacing recess of a plurality of plumbous damping part (11), the spacing recess of a ring spring part (12) from a left side to the right side in proper order, and each part groove position and inner core (1) one-to-one.
Preferably, the suspension bridge energy dissipation type central buckle that resets further includes: outer tube (4), friction plate (3) are fixed in outer tube (4) inner wall, outer tube (4) cover is located outside inner tube (2), evenly leaves the bolt hole that is used for connecting two semicircle outer tubes (4) in the edge of a wing position of outer tube (4), and this bolt hole adopts bolt (5) to fix, outer tube (4) be two terminal closed and have the semicircular steel pipe of flange, outer tube (4) are fixed with inner core (1) through outer tube spacing recess (10) of inner core (1).
Preferably, the ring spring part comprises a ring spring (13), ring spring baffles (14) and a limiting ring (15), the ring spring (13) is formed by assembling a plurality of pairs of steel rings with conical surfaces inside and outside the ring spring, the diameter of the inner ring is reduced after the inner ring is compressed, the inner diameter of the inner ring needs to be larger than that of the inner core (1) and a proper gap is reserved, the ring spring (13) penetrates through the inner core (1), the ring spring baffles (14) are made of steel and are of a ring shape, the inner diameter of the inner ring is smaller than that of the inner ring of the ring spring (13), the outer diameter of the inner ring is larger than that of the outer ring of the ring spring (13), the two ring spring baffles (14) are respectively arranged at the left end and the right end of the ring spring (13), the centers of the two ring spring baffles are aligned, and the limiting ring (15) is welded at the rightmost end of the inner core (1).
Preferably, the lead damping part consists of a plurality of lead blocks (16), and the lead blocks (16) are uniformly fixed in the lead damping part limiting groove (11) of the inner core (1) in an adhesive mode.
Preferably, the friction plates (3) are of a plurality of semicircular sections, the friction plates (3) are fixed on the inner wall of the outer pipe (4) in an adhesive mode and are uniformly distributed along the inner wall of the outer pipe, and pre-pressure is adjusted through outer pipe connecting bolts (5).
Preferably, the sealing ring (6) is made of rubber and is sleeved at a proper position on the right side of the inner pipe (2). The sealing ring (6) is attached to the tail ends of the inner pipe and the outer pipe, so that the relative motion of the inner pipe and the outer pipe when the whole device is pulled is met, the internal structure is completely sealed, and the inside of the device is protected to play a role in corrosion resistance.
Preferably, the sealing strip (7) is made of rubber and is adhered to the inner side of the flange of the outer pipe (4), so that the sealing problem caused by the fact that the two semicircular outer pipes are installed through bolts is solved.
According to another aspect of the invention, a design and use method of a suspension bridge reset energy-consuming type center buckle is provided, which comprises the following steps:
prefabricating an inner core (1), an inner pipe (2) and an outer pipe (4), carrying out shot blasting and rolling on the surfaces of hinge holes at the end parts of the inner core and the inner pipe, carrying out surface quenching and surface chemical heat treatment, and prefabricating a connecting piece; prefabricating a ring spring baffle (14) and a limiting ring (15), coating an anti-corrosion and anti-rust coating on the prefabricated part, and prefabricating a lead damping part and a friction plate part by adopting epoxy zinc-rich primer, epoxy mica iron intermediate paint and polyurethane finish paint;
sleeving a left ring spring baffle (14) into a ring spring part limiting groove (12) reserved in an inner core (1), penetrating a ring spring (13) through the inner core (1), applying pre-pressure to the ring spring part to a designed value by adopting a hydraulic machine, sleeving a right ring spring baffle (14) into a corresponding groove (12), and welding a limiting ring (15) at the rightmost end of the inner core (1);
a plurality of lead blocks (16) are adhered in the reserved groove (11) of the inner core, the two semicircular inner pipes (2) are sleeved outside the inner structure, and the ring spring component and the lead damping component are respectively embedded in the groove;
uniformly gluing and fixing the friction plates on the inner walls of the two semicircular outer pipes (4) in a strip form, fixing the sealing strips (7) at the flange positions of the outer pipes, sleeving the outer pipes (4) outside the inner pipe (2) to ensure that gaps left between the inner pipe (2) and the outer pipes (4) are in a vertical state, tightly attaching the right ends of the outer pipes to sealing rings (6) sleeved on the inner pipes, fixing the two outer pipes into a whole through bolts (5), and applying pre-pressure to the friction plates (3);
the whole device is connected with an external structure into a whole through an inner core tail end hinge hole (8) and an inner tube tail end hinge hole (9).
Preferably, the method further comprises the following steps:
(1) step S1, determining the design axial tension F of the center button according to the internal force, displacement and energy consumption requirements of the center button under the action of earthquakeaDesign displacement delta and design energy consumption We；
(2) Step S2, designing energy consumption WeEnergy consumption W of lead damping part divided according to proportion alpha and proportion (1-alpha)lEnergy consumption W of friction platefDetermining the yield bearing capacity F of the lead damping partlSliding friction force F with friction platefAnd further determining the size and number n of lead damperslSize and prepressing force F of friction platepAnd a number nf；
We＝Wl+WfFormula (1)
Wl＝αWe＝4Fl·ΔlFormula (2)
Wf＝(1-α)We＝Ff·ΔlFormula (3)
Fs＞Fl+FfFormula (4)
Fl＝nl·τγ·al·blFormula (5)
Ff＝nf·μs·FpFormula (8)
μsCoefficient of sliding friction
τγYield shear stress
G-shear modulus
A-area of shear
Gamma-shear strain
Δl——Designed displacement
(3) Step S3, designing the combined ring spring according to the set principle;
(4) step S4, according to the distance D between the main beam and the main cable connected with the central buckle componentcDetermining a total design length of dc＝Dc/nc(nc＝1,2,3……)；
(5) Step S5, determining the minimum interval of the limiting groove of the lead damping part according to the principle that the yield load of the lead damper is smaller than the limiting capacity of the limiting groove, and determining the minimum interval of the limiting groove of the lead damping part according to the maximum axial tension FcThe axial force is smaller than the shearing-resistant bearing capacity of the bolts, the diameter and the number of the bolts are determined, and the width of the flange of the outer pipe is determined according to the size of the bolts;
Fg＝fy·lg·agformula (9)
FgShear-resisting bearing capacity of inner core and inner pipe
lgSpacing of the lead damping member limiting grooves
agWidth of lead block
fyShear strength of inner core and inner tube
fybDesign value of shear strength of bolt
dbBolt diameter
nbNumber of bolts
(6) Step S6, determining the design stroke L according to the maximum displacement requirement of the energy-consuming reset central buttondAnd make the design stroke Ld<Reserved gap value Ep；
(7) Step S7, designing axial force F according to the inner core and the inner tubeinDetermining the diameter of the inner core, the diameter of the inner pipe and the wall thickness according to the principle that the lead damping yield force is greater than the sum of the design load of the ring spring; according to the design axial force F of the outer tubeoutDetermining the diameter and the wall thickness of the outer pipe on the principle that the static friction force of the friction plate is greater than the static friction force of the friction plate;
(8) step S8, checking the rationality of the device design by adopting a theoretical method or a numerical analysis method, and adjusting components for the problems existing in the structure by taking the analysis result as reference until the design scheme meets various performance requirements;
(9) and step S9, processing and assembling the device parts according to the design scheme, developing a pseudo-static test and a fatigue performance test according to the requirement, and further checking indexes of the designed central buckle, such as energy consumption capability, bearing capability, self-resetting capability and fatigue performance.
Preferably, the design for unfolding the ring spring according to the setting principle comprises the following steps:
(1) according to the initial pre-pressure F of the ring springdpNot less than maximum static friction force F of friction platesfYield force F of lead damperlPrinciple of sum, determining initial pre-pressure Fdp；
(2) Design of load F from ring springdMaximum static friction force F of friction platesfYield force F of lead damperlThe sum of the axial tension F and the axial tension F is larger than the designed axial tension F of the central buckle under the action of earthquakeaDetermining the design load F of the ring springd；
(3) The design displacement Delta of the central button is smaller than that of the ring springdBy determining the ring spring design displacement delta with a certain safety factord＝a·Δ；
(4) According to design load F of ring springdAnd a design displacement ΔdDetermining the specific size of the ring spring;
(5) and determining the sizes of the ring spring baffle and the limiting ring according to the determined size of the ring spring.
According to the technical scheme provided by the embodiment of the invention, the energy consumption resetting central buckle of the suspension bridge provided by the embodiment of the invention adopts the lead damping part to shear energy consumption and the friction plate between the inner pipe and the outer pipe to rub energy consumption, so that the energy consumption capability of the device can be improved, the self-resetting capability is realized through the ring spring part, and the residual displacement of the structure under the action of dynamic load is reduced. Meanwhile, the device has the advantages of universality, low price, simple part manufacturing, compact internal space and higher utilization rate of required materials. The device has better sealing effect, can avoid the structure from contacting with the outside and can adapt to severe environment. Install through the structural style of outside articulated series connection, and whole device passes through the fixed and connection of recess and bolt completion part, relies on simple instrument can accomplish device dismantlement and equipment work, and the maintenance of the later stage device inner member of being convenient for and the change after the component damage possess good convertibility and higher economic nature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic application diagram of a suspension bridge energy dissipation type center buckle according to an embodiment of the present invention;
fig. 2 is an external schematic view of a suspension bridge energy dissipating type center buckle according to an embodiment of the present invention, wherein (a) is an external front view and (b) is an external top view;
fig. 3 is a schematic diagram of an internal structure of a suspension bridge energy dissipating type center buckle according to an embodiment of the present invention, wherein (a) is a sectional view taken along line a-a, (B) is a sectional view taken along line B-B, (C) is a sectional view taken along line C-C, (D) is a sectional view taken along line D-D, and (E) is a sectional view taken along line E-E;
fig. 4 is a schematic diagram of an inner core of a suspension bridge energy dissipating type center buckle according to an embodiment of the present invention, wherein (a) is a front view of the inner core, and (b) is a top view of the inner core;
fig. 5 is a schematic diagram of an inner tube of a suspension bridge energy dissipation type center buckle according to an embodiment of the present invention, wherein (a) is a front view of the inner tube, and (b) is a top view of the inner tube;
fig. 6 is a schematic diagram of an outer tube of a suspension bridge energy dissipation type center buckle according to an embodiment of the present invention, wherein (a) is a front view of the outer tube, and (b) is a top view of the outer tube;
fig. 7 is a schematic diagram of a lead block shear deformation according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a ring spring according to an embodiment of the present invention;
fig. 9 is a schematic diagram of lead distribution and a schematic diagram of a fixing bolt structure according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a design calculation method of a suspension bridge energy dissipation type central buckle under an axial tension according to an embodiment of the present invention;
the reference numbers in the figures illustrate: 1-inner core, 2-inner tube, 3-friction plate, 4-outer tube, 5-bolt, 6-sealing ring, 7-sealing strip, 8-inner core hinge hole, 9-inner tube hinge hole, 10-outer tube limit groove, 11-lead damping part limit groove, 12-ring spring part limit groove, 13-ring spring, 14-ring spring baffle, 15-limit ring and 16-lead block.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
According to the embodiment of the invention, the relative displacement of the inner pipe and the outer pipe of the structure enables the lead damping part to consume energy in a shearing mode and the friction plate part to consume energy in a friction mode, and the self-resetting function of the ring spring part is combined to obtain the novel suspension bridge resetting energy-consuming type central buckle. In the structure, the lead damping part and the friction plate are connected in parallel and then connected in series with the ring spring part, and the structural form can lead the lead damping part and the friction plate to be coordinated and deformed, so that the energy consumption is jointly realized, and the energy consumption capacity of the structure is enhanced. The ring spring part can provide restoring force for the device, so that the device has a reset function and the influence of residual displacement is reduced. The inner ring spring and the lead damping part of the device are limited by the groove, and the friction plate is fixed on the inner wall of the outer tube in an adhesive mode. The device wholly relies on outer tube flange side bolted connection fixed, adopts partial simple and easy equipment can accomplish to dismantle and reorganize, and the later stage maintenance and the change after the internal member damage are detained to central authorities of being convenient for. In addition, the device has high utilization rate of the inner space, better whole sealing performance of the structure, capability of adapting to severe environment, easy disassembly and replacement of the whole structure, convenient maintenance and repair, and good economical efficiency and adaptability.
The embodiment of the invention provides a suspension bridge resetting energy-consuming type central buckle. The friction plate and the lead damping component are connected in parallel and then connected in series with the ring spring.
An application schematic diagram of the suspension bridge resetting energy-consuming type central buckle of the embodiment of the invention is shown in fig. 1; the external schematic view is shown in FIG. 2, wherein (a) is an external front view and (b) is an external top view; the schematic diagram of the internal structure is shown in FIG. 3, wherein (a) is a sectional view A-A, (B) is a sectional view B-B, (C) is a sectional view C-C, (D) is a sectional view D-D, and (E) is a sectional view E-E.
The energy-consumption type central buckle for resetting the suspension bridge comprises an inner core (1), a ring spring component, a lead damping component, an inner pipe (2), a friction plate (3), an outer pipe (4), a bolt (5), a sealing ring (6) and a sealing strip (7).
Fig. 4 is a schematic diagram of an inner core of the energy dissipating type center buckle of the suspension bridge of the embodiment, wherein: (a) is the front view of the inner core, and (b) is the top view of the inner core. Inner core (1) be located device axis, inner core (1) left side end is equipped with hinge hole (8). The inner core (1) is a solid round steel bar. The inner core (1) is provided with an outer tube limiting groove (10), a plurality of lead damping part limiting grooves (11) and a ring spring part limiting groove (12) from left to right for placing and restraining corresponding parts, and the left end is provided with a hinge hole (8) for connecting the whole device with an external structure.
Fig. 5 is a schematic diagram of an inner tube of the suspension bridge energy dissipation type center buckle according to the embodiment of the present invention, wherein: (a) is a front view of the inner tube, and (b) is a top view of the inner tube. The inner core (1) is located to inner tube (2) cover, and inner tube (2) right side end is equipped with hinge hole (9) equally, and both ends hinge hole is used for external connection. The inner tube (2) is two semicircular steel tubes, the inner wall of the inner tube is provided with a certain number of grooves which are sequentially a plurality of lead damping part limiting grooves (11) and a ring spring part limiting groove (12) from left to right, the groove positions of the parts are in one-to-one correspondence with the inner core, and the right end of the inner tube is provided with a hinge hole (9) for connecting the whole device with the outside.
Fig. 6 is a schematic diagram of an outer tube of the suspension bridge energy dissipation type center buckle according to the embodiment of the present invention, wherein: (a) is a front view of the outer tube, and (b) is a top view of the outer tube. The friction plate (3) is fixed on the inner wall of the outer pipe (4), the outer pipe (4) is sleeved outside the inner pipe (2), and bolt holes are uniformly reserved in the flange positions of the outer pipe (4) and used for connecting the two semicircular outer pipes (4). The outer pipe (4) is a semicircular steel pipe with two closed tail ends and flanges. The outer pipe is fixed with the inner core (1) through an outer pipe limiting groove (10) of the inner core, a certain number of bolt holes are arranged at the flange of the steel pipe (4), and the bolt holes are fastened by bolts (5), so that the sealing and the application of the required pre-pressure of the whole device are guaranteed, and a prerequisite condition is provided for the energy consumption work of the friction plate (3). Adopt multiple recess and bolted connection to carry on spacingly and fixed, improve the convertibility of structure.
The ring spring component comprises a ring spring (13), ring spring baffles (14) and a limiting ring (15), the ring spring (13) is formed by assembling a plurality of pairs of steel rings with conical surfaces inside and outside the ring spring, the diameter of the inner ring can be reduced after the inner ring is compressed, the inner diameter of the inner ring needs to be larger than the diameter of the inner core (1) and a proper gap is reserved, the ring spring (13) penetrates through the inner core (1), the ring spring baffles (14) are made of steel and are of a ring shape, the inner diameter of the inner ring is smaller than the diameter of the inner ring of the ring spring (13), the outer diameter of the inner ring is larger than the diameter of the outer ring of the ring spring (13), the two ring spring baffles (14) are respectively arranged at the left end and the right end of the ring spring (13), the centers of the two ring spring baffles are aligned, and the limiting ring (15) is welded at the rightmost end of the inner core (1).
The lead damping component is composed of a plurality of lead blocks (16), the lead blocks are uniformly fixed in the lead damping component limiting groove (11) of the inner core in an adhesive mode, and the lead damping component is ensured to be positioned in the groove when the inner pipe (2) is installed.
The inner core hinge hole (8) and the inner tube hinge hole (9) are weak parts of the device, the alloy structural steel with better fatigue performance is adopted for processing and manufacturing, a surface strengthening method is adopted at the stress contact surface of the inner core hinge hole (8) and the inner tube hinge hole (9), and the fatigue resistance of the device is improved, for example: the connecting piece is processed by interference fit through surface shot blasting, rolling, quenching and surface chemical heat treatment.
The friction plates (3) are of a plurality of semicircular sections, are fixed on the inner wall of the outer pipe (4) in a high-temperature-resistant structural adhesive bonding mode, are uniformly distributed along the inner wall of the outer pipe, and are pre-pressure adjusted through outer pipe connecting bolts (5).
The sealing ring (6) is made of rubber and is adhered to the tail end of the right side of the outer pipe. The sealing ring (6) is attached to the tail ends of the right sides of the inner pipe and the outer pipe, so that the relative movement of the inner pipe and the outer pipe when the whole device is pulled is met, the internal structure is completely sealed, and the device is protected from corrosion.
The sealing strip (7) is made of rubber and is adhered to the inner side of the flange of the outer pipe (4), so that the sealing performance between the two semicircular outer pipes is enhanced when the bolt is installed.
The working principle of the energy-consumption type reset central buckle of the suspension bridge provided by the embodiment of the invention comprises the following steps: when the structure drives the central button to move in a tensile mode along the axial direction, the inner core (1) and the outer pipe (3) move relative to the inner pipe (2) together. The relative motion of inner tube (2) and inner core (1) makes ring spring (13) be in the pressurized state always, continuously provides the restoring force for the device, makes the plumbous damping part of embedding between inner core (1) and inner tube (2) take place shear deformation simultaneously, and outer tube inner wall and inner tube outer wall take place the friction action with friction plate (3) respectively, and the two consumes energy jointly to play the purpose of dissipating energy.
Fig. 10 is a schematic diagram illustrating a principle of a design calculation method of a suspension bridge reset energy-consuming type central buckle under an axial tension effect according to an embodiment of the present invention, where the specific implementation manner includes the following steps:
selecting proper materials to prefabricate the inner core (1), the inner pipe (2) and the outer pipe (4), carrying out surface shot blasting and rolling on the surfaces of the hinge holes at the end parts of the inner core and the inner pipe, carrying out surface quenching and surface chemical heat treatment, and prefabricating the connecting piece. Prefabricating a ring spring baffle (14) and a limiting ring (15), coating anti-corrosion and anti-rust paint on the prefabricated part, and prefabricating a lead damping part and a friction plate part by adopting epoxy zinc-rich primer, epoxy mica iron intermediate paint and polyurethane finish paint.
Sleeving a left ring spring baffle (14) into a ring spring part limiting groove (12) reserved in an inner core (1), penetrating a ring spring (13) through the inner core (1), applying pre-pressure to the ring spring part to a designed value by adopting a hydraulic machine, sleeving a right ring spring baffle (14) into a corresponding groove (12), and welding a limiting ring (15) at the rightmost end of the inner core (1);
a plurality of lead blocks (16) are stuck in the reserved groove (11) of the inner core. Two semicircular inner pipes (2) are sleeved outside the internal structure, so that the ring spring part and the lead damping part are respectively embedded into the grooves.
The friction plate is uniformly adhered and fixed on the inner walls of the two semicircular outer pipes (4) in a strip form, the sealing strip (7) is fixed at the flange position of the outer pipe, the outer pipe (4) is sleeved outside the inner pipe (2), the gap reserved between the inner pipe (2) and the outer pipe (4) is ensured to be in a vertical state, and the right end of the outer pipe (4) is tightly attached to the sealing ring (6) sleeved on the inner pipe. The two outer pipes are fixed into a whole through bolts (5), and pre-pressure is applied to the friction plate (3) so as to play a role in friction energy consumption.
The whole device is connected with an external structure into a whole through an inner core tail end hinge hole (8) and an inner tube tail end hinge hole (9).
The design calculation method of the energy-consumption type reset central buckle of the suspension bridge under the action of the axial tension comprises the following steps:
(1) step S1, determining the design axial tension F of the center button according to the internal force, displacement and energy consumption requirements of the center button under the action of earthquakeaDesign displacement delta and design energy consumption We。
(2) Step S2, fig. 7 is a schematic diagram of lead block shearing deformation according to an embodiment of the present invention. Will design the energy consumption WeEnergy consumption W of lead damping part divided according to proportion alpha and proportion (1-alpha)lEnergy consumption W of friction platefDetermining the yield bearing capacity F of the lead damping partlSliding friction force F with friction platefAnd further determining the size and number n of lead damperslSize and prepressing force F of friction platepAnd a number nf。
We＝Wl+WfFormula (1)
Wl＝αWe＝4Fl·ΔlFormula (2)
Wf＝(1-α)We＝Ff·ΔlFormula (3)
Fs＞Fl+FfFormula (4)
Fl＝nl·τγ·al·blFormula (5)
Ff＝nf·μs·FpFormula (8)
μsCoefficient of sliding friction
τγYield shear stress
G-shear modulus
A-area of shear
Gamma-shear strain
Δl-design of the displacement
(3) Step S3, fig. 8 is a schematic diagram of a ring spring structure according to an embodiment of the present invention. The ring spring is developed and designed according to the following principles and substeps:
1) according to the initial pre-pressure F of the ring springdpNot less than maximum static friction force F of friction platesfYield force F of lead damperlPrinciple of sum, determining initial pre-pressure Fdp；
2) Design of load F from ring springdMaximum static friction force F of friction platesfYield force F of lead damperlThe sum of the axial tension F and the axial tension F is larger than the designed axial tension F of the central buckle under the action of earthquakeaDetermining the design load F of the ring springd；
3) The design displacement Delta of the central button is smaller than that of the ring springdBy determining the ring spring design displacement delta with a certain safety factord＝a·Δ；
4) According to design load F of ring springdAnd a design displacement ΔdDetermining the specific size of the ring spring;
5) and determining the sizes of the ring spring baffle and the limiting ring according to the determined size of the ring spring.
(4) Step S4, connecting the main beam and the main cable according to the central buckle componentDistance DcDetermining a total design length of dc＝Dc/nc(nc＝1,2,3……)。
(5) Step S5, determining the minimum interval of the limiting groove of the lead damping part according to the principle that the yield load of the lead damper is smaller than the limiting capacity of the limiting groove, and determining the minimum interval of the limiting groove of the lead damping part according to the maximum axial tension FcAnd the axial force is smaller than the shearing-resistant bearing capacity of the bolts, the diameter and the number of the bolts are determined, and the width of the flange of the outer pipe is determined according to the size of the bolts.
Fg＝fy·lg·agFormula (9)
FgShear-resisting bearing capacity of inner core and inner pipe
lgSpacing of the lead damping member limiting grooves
agWidth of lead block
fyShear strength of inner core and inner tube
fybDesign value of shear strength of bolt
dbBolt diameter
nbNumber of bolts
(6) Step S6, determining the design stroke L according to the maximum displacement requirement of the energy-consuming reset central buttondAnd make the design stroke Ld<Reserved gap value Ep。
(7) Step S7, designing axial force F according to the inner core and the inner tubeinDetermining the diameter of the inner core, the diameter of the inner pipe and the wall thickness according to the principle that the sum of the lead damping yield force and the design load of the combined ring spring is greater; design axial force F from outer tubeoutThe diameter and the wall thickness of the friction plate are determined according to the principle that the static friction force of the friction plate is greater than the static friction force of the friction plate.
(8) And step S8, checking the rationality of the device design by adopting a theoretical method or a numerical analysis method, and adjusting the components for the problems existing in the structure by taking the analysis result as reference until the design scheme meets various performance requirements.
(9) And step S9, processing and assembling the device parts according to the design scheme, carrying out a pseudo-static test and a fatigue performance test according to needs, and further checking indexes of the designed central buckle, such as energy consumption capability, bearing capability, self-resetting capability and fatigue performance.
The energy-consuming type central buckle for resetting the suspension bridge can be changed as follows according to actual requirements:
(1) the invention adopts the ring spring part to realize the self-resetting function of the whole device, and the specification of the ring spring can be changed according to different requirements. The arrangement position of the ring spring, except for arranging one end of the inner core, can be provided with a group of ring spring components at two ends of the inner core respectively if necessary.
(2) The realization form of the self-resetting function can be changed, the internal structure can be simply changed except for the ring spring, and the self-resetting function of the device is realized by using members such as a spring, a shape memory alloy, a combined disc spring and the like.
(3) The arrangement number of the lead damping components can be changed according to the implementation requirement, the arrangement form can be uniform, centralized or other along the inner core, lead blocks with different specifications can be adopted, or mild steel or other energy dissipation components can be replaced.
(4) The number of the friction plates between the inner pipe and the outer pipe can be changed, the arrangement form can also adopt circumferential dispersed arrangement or centralized arrangement, and the like, and the inner wall of the outer pipe can be completely glued with the friction plates when necessary. Friction plates made of different materials can be adopted, the number of bolts can be added or reduced, the specification of the bolts can be changed, the pretightening force of the bolts can be adjusted, and friction plates can be fixed by other methods except cementing.
(5) If necessary, the devices can be connected in series, parallel and other forms, so that different energy consumption capacities can be obtained, and the connection mode can adopt the forms of hinging, welding and the like according to specific projects.
(6) The connection between the two ends of the device and the structure can be realized by bolts or other forms according to the actual engineering structure.
(7) The anticorrosion treatment of each part of the device can be performed by adopting anticorrosion paint coating or the like according to the anticorrosion requirement of a specific engineering structure.
(8) The central buckle arrangement form can form a unit type central buckle through a series connection form or a parallel connection form, and the central buckle is determined according to specific engineering requirements.
The suspension bridge reset energy-consuming central buckle has the advantages that:
(1) when the external structure of the reset energy-consumption type central buckle of the suspension bridge in the embodiment of the invention drives the device to be pulled, the inner core and the inner pipe, and the outer pipe and the inner pipe simultaneously perform relative motion, and the lead damping part consumes energy simultaneously through shearing action and friction action of the inner surface and the outer surface of the friction plate. Meanwhile, the number and the specification of the friction plate and the lead damping part can be adjusted through the actually required energy consumption capacity, so that the device has stronger applicability to different dynamic loads.
(2) The prepressing ring spring part is always kept in a pressed state, so that sufficient restoring force is provided for the device, the device is enabled to reset automatically, and the residual deformation of the structure after the earthquake is reduced.
(3) The invention has good internal structure sealing performance, can perform rust prevention and abrasion prevention treatment on a plurality of parts, can adapt to severe bridge engineering environment, and can stably maintain higher energy consumption capability for a long time.
(4) The invention is made of common metal materials, has simple section form, more circular sections, lower manufacturing and processing difficulty and cost and good engineering economic benefit.
(5) The outer pipe is connected by bolts, and the components are easy to disassemble and replace, so that the assembly type production and manufacturing and the later maintenance are facilitated.
(6) The invention can be arranged at the central buckle in a series connection mode, and can replace a damaged device, thereby reducing the replacement difficulty and the economic cost.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The suspension bridge resetting energy-consuming type central buckle is characterized by consisting of a friction plate, two energy-consuming components of lead damping and an annular spring self-resetting component, wherein the friction plate is connected with the lead damping component in parallel and then connected with the annular spring component in series.
2. The suspension bridge energy dissipating center buckle of claim 1, further comprising: inner core (1), inner core (1) are located the device axis, the left side end of inner core (1) is equipped with hinge hole (8) for being connected of whole device and external structure thing, inner core (1) are solid circular steel bar, and inner core (1) sets up outer tube spacing recess (10), the spacing recess of a plurality of plumbous damping part (11) and the spacing recess of a ring spring part (12) from a left side to the right side for place and restrain and correspond the part.
3. The suspension bridge energy dissipation type central buckle that resets of claim 1, characterized in that, the suspension bridge energy dissipation type central buckle that resets still includes inner tube (2), the right side end of inner tube (2) is provided with hinge hole (9) that is used for whole device and external connection, inner tube (2) are two semicircular steel pipes, and the inner wall sets up a certain amount of recess, and be a plurality of plumbous damping part spacing recess (11), a ring spring part spacing recess (12) from a left side to the right side in proper order, each part recess position and inner core (1) one-to-one.
4. The suspension bridge energy dissipating center buckle of claim 1, further comprising: outer tube (4), outer tube (4) cover is located outside inner tube (2), evenly leaves the bolt hole that is used for connecting two semicircle outer tubes (4) in the edge of a wing position of outer tube (4), and this bolt hole adopts bolt (5) to fix, outer tube (4) be two terminal closed and have the semicircular steel pipe of edge of a wing, outer tube (4) are fixed with inner core (1) through outer tube spacing recess (10) of inner core (1).
5. The suspension bridge energy dissipation type central buckle that resets of claim 1, wherein, the ring spring part includes ring spring (13), ring spring baffle (14) and a spacing ring (15), ring spring (13) are assembled by many pairs of steel rings with conical surfaces inside and outside, because the diameter can reduce after the internal ring is compressed, its internal diameter needs to be greater than the diameter of inner core (1) and leave suitable clearance, the clearance size is decided according to the ring spring specification, ring spring (13) passes inner core (1), ring spring baffle (14) are made of steel, for the ring type, the internal diameter is less than the ring diameter in ring spring (13), the external diameter is greater than the outer ring diameter of ring spring (13), two ring spring baffles (14) are respectively placed in ring spring (13) both ends, the center aligns, and weld spacing ring (15) in the rightmost end of inner core (1).
6. The suspension bridge energy-dissipating center buckle according to claim 1, wherein the lead damping member is composed of a plurality of lead blocks (16), and the plurality of lead blocks (16) are uniformly fixed in the lead damping member limiting grooves (11) of the inner core (1) in an adhesive manner.
7. The suspension bridge energy dissipation type central buckle according to claim 1, further comprising friction plates (3), wherein the friction plates (3) have a plurality of semicircular cross sections, the friction plates (3) are fixed on the inner wall of the outer tube (4) in an adhesive manner, and are uniformly distributed along the inner wall of the outer tube, and pre-pressure is adjusted through outer tube connecting bolts (5).
8. The suspension bridge energy dissipating center buckle of claim 1, further comprising: sealing washer (6) and sealing strip (7), sealing washer (6) adopt the rubber material, overlaps it in inner tube (2) right side suitable position, and sealing washer (6) and interior, the terminal laminating of outer tube satisfy the relative motion of inner tube and outer tube when whole device is drawn, and inner structure is sealed completely, and inside the protection device, play anticorrosive effect. The sealing strip (7) is made of rubber and is adhered to the inner side of the flange of the outer pipe (4), so that the sealing problem caused by the fact that the two semicircular outer pipes are installed through bolts is solved.
9. A design and use method of a suspension bridge reset energy-consuming type central buckle is characterized by comprising the following steps:
prefabricating an inner core (1), an inner pipe (2) and an outer pipe (4), performing shot blasting, rolling, quenching and chemical heat treatment on the surfaces of hinge holes at the end parts of the inner core and the inner pipe, prefabricating a connecting piece, prefabricating a ring spring baffle (14) and a limiting ring (15), and performing anticorrosive and anti-corrosion coating, wherein epoxy zinc-rich primer, epoxy mica iron intermediate paint and polyurethane finish paint can be adopted, and a lead damping part and a friction plate part are prefabricated;
sleeving a left ring spring baffle (14) into a ring spring part limiting groove (12) reserved in an inner core (1), penetrating a ring spring (13) through the inner core (1), applying pre-pressure to the ring spring (13) to a designed value by adopting a hydraulic machine, sleeving a right ring spring baffle (14) into a corresponding groove (12), and welding a limiting ring (15) at the rightmost end of the inner core (1);
a plurality of lead blocks (16) are adhered in the reserved groove (11) of the inner core, the two semicircular inner pipes (2) are sleeved outside the inner structure, and the ring spring component and the lead damping component are respectively embedded in the groove;
uniformly gluing and fixing the friction plates on the inner walls of the two semicircular outer pipes (4) in a strip form, fixing the sealing strips (7) at the flange positions of the outer pipes, sleeving the outer pipes (4) outside the inner pipe (2) to ensure that gaps left between the inner pipe (2) and the outer pipes (4) are in a vertical state, tightly attaching the right ends of the outer pipes to sealing rings (6) sleeved on the inner pipes, fixing the two outer pipes into a whole through bolts (5), and applying pre-pressure to the friction plates (3);
the whole device is connected with an external structure into a whole through an inner core tail end hinge hole (8) and an inner tube tail end hinge hole (9).
10. The design and use method of the suspension bridge energy dissipation type center buckle according to claim 9, further comprising:
(1) step S1, determining the design axial tension F of the center button according to the internal force, displacement and energy consumption requirements of the center button under the action of earthquakeaDesign displacement delta and design energy consumption We；
(2) Step S2, designing energy consumption WeEnergy consumption W of lead damping part divided according to proportion alpha and proportion (1-alpha)lEnergy consumption W of friction platefDetermining the yield bearing capacity F of the lead damping partlSliding friction force F with friction platefAnd further determining the size and number n of lead damperslSize and prepressing force F of friction platepAnd a number nf；
(3) Step S3, according to the setting principle, the ring spring is unfolded and designed:
1) according to the initial pre-pressure F of the ring springdpNot less than maximum static friction force F of friction platesfYield force F of lead damperlPrinciple of sum, determining initial pre-pressure Fdp；
2) Design of load F from ring springdMaximum static friction force F of friction platesfYield force F of lead damperlShould be greater than the sum of the stresses under the action of earthquakeDesign axial tension F of center buttonaDetermining the design load F of the ring springd；
3) The design displacement Delta of the central button is smaller than that of the ring springdBy determining the ring spring design displacement delta with a certain safety factord＝a·Δ；
4) According to design load F of ring springdAnd a design displacement ΔdDetermining the specific size of the ring spring;
5) and determining the sizes of the ring spring baffle and the limiting ring according to the determined size of the ring spring.
(4) Step S4, according to the distance D between the main beam and the main cable connected with the central buckle componentcDetermining a total design length of dc＝Dc/nc(nc＝1,2,3……)；
(5) Step S5, determining the minimum interval of the limiting groove of the lead damping part according to the principle that the yield load of the lead damper is smaller than the limiting capacity of the limiting groove, and determining the minimum interval of the limiting groove of the lead damping part according to the maximum axial tension FcThe axial force is smaller than the shearing-resistant bearing capacity of the bolts, the diameter and the number of the bolts are determined, and the width of the flange of the outer pipe is determined according to the size of the bolts;
(6) step S6, determining the design stroke L according to the maximum displacement requirement of the energy-consuming reset central buttondAnd make the design stroke Ld<Reserved gap value Ep；
(7) Step S7, designing axial force F according to the inner core and the inner tubeinDetermining the diameter of the inner core according to the principle that the sum of the lead damping yield force and the ring spring design load is greater than; according to the design axial force F of the outer tubeoutDetermining the diameter and the wall thickness of the outer pipe on the principle that the static friction force of the friction plate is greater than the static friction force of the friction plate;
(8) step S8, checking the rationality of the device design by adopting a theoretical method or a numerical analysis method, and adjusting components for the problems existing in the structure by taking the analysis result as reference until the design scheme meets various performance requirements;
(9) and step S9, processing and assembling the device parts according to the design scheme, developing a pseudo-static test and a fatigue performance test according to the requirement, and further checking indexes of the designed central buckle, such as energy consumption capability, bearing capability, self-resetting capability and fatigue performance.
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| CN111691286A (en) * | 2020-06-05 | 2020-09-22 | 中交第二公路勘察设计研究院有限公司 | Suspension bridge hinged energy-consuming damping buckle structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635372A (en) * | 2022-03-21 | 2022-06-17 | 武汉理工大学 | Multi-tower suspension bridge reinforcing structure for overcoming middle tower effect |
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