CN115125855B - Anti-seismic auxiliary structure for continuous beam and construction method thereof - Google Patents
Anti-seismic auxiliary structure for continuous beam and construction method thereof Download PDFInfo
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- CN115125855B CN115125855B CN202210779551.7A CN202210779551A CN115125855B CN 115125855 B CN115125855 B CN 115125855B CN 202210779551 A CN202210779551 A CN 202210779551A CN 115125855 B CN115125855 B CN 115125855B
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000009826 distribution Methods 0.000 claims abstract description 30
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000013016 damping Methods 0.000 claims description 21
- 239000004567 concrete Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 210000002435 tendon Anatomy 0.000 claims description 3
- 239000004035 construction material Substances 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 19
- 238000004458 analytical method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000009413 insulation Methods 0.000 description 9
- 230000001133 acceleration Effects 0.000 description 8
- 230000035939 shock Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 241001139947 Mida Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an anti-seismic auxiliary structure for a continuous beam and a construction method thereof, wherein the anti-seismic auxiliary structure comprises a bracket which is fixed on the side surface of a pier along the bridge direction; the buffer support is an elastic piece, one end of the buffer support is used for being connected with the bridge pier or the bracket, and the other end of the buffer support is used for being connected with the bottom of the beam body; a lateral distribution beam disposed on top of the carriage; the haunching beam is wedge-shaped, the bottom of the haunching beam is abutted with the top of the transverse distribution beam, and the top of the haunching beam is used for being abutted with the bottom of the wing plate of the beam body; the screw thread reinforcing steel bars sequentially penetrate through the beam body, the haunching beam, the transverse distribution beam and the bracket and are fixed through nuts at two ends of the screw thread reinforcing steel bars. According to the invention, the influence of vibration on construction is reduced through the buffer support, and the bracket can be converted into an anti-seismic auxiliary structure to be permanently reserved at the bridge pier after the construction of the beam body is completed, so that the construction material is fully utilized, and the anti-seismic performance of the bridge body is improved. The invention relates to the technical field of bridges.
Description
Technical Field
The invention relates to an anti-seismic auxiliary structure for a continuous beam and a construction method thereof, belonging to the technical field of bridges.
Background
In large and medium span railroad bridges, continuous steel trusses, concrete continuous beams, steel-concrete continuous composite beams are common structural types. The cantilever pouring construction method or the swivel construction method is generally adopted, wherein the cantilever pouring construction method refers to a construction method that working platforms are arranged on two sides of a pier, cement concrete beams are poured into a midspan cantilever section by section in a balanced manner, and prestress is applied section by section; the swivel construction method is to use a simple bracket to finish half-bridge prefabrication, and then fold the two half-bridges to the axis position of the bridge by taking the bridge structure as a rotator. However, in any construction method, the pier beam is temporarily solidified during the construction process, and temporary solidification facilities are removed and system conversion is performed after the structure is closed.
Generally, temporary consolidation facilities are controlled primarily by the anti-overturning stability of the beam body rather than the strength. For easy dismantling, temporary consolidation facilities have various forms, and common forms are to adopt concrete cushion blocks, finish rolling deformed steel bars, bolts and the like, and consolidate the beam body and the pier together by stretching the finish rolling deformed steel bars.
However, most brackets are only used for specific bridge bodies and cannot be reused due to the influence of different factors such as bridge pier forms, segment lengths, side spans and mid-span construction modes, and only can be discarded after being dismantled, so that resource waste is caused. Moreover, the prior temporary brackets only adopt simple steel frame structures, have poor anti-seismic performance, and are easy to bend and deform when encountering vibration in the construction process, thereby causing construction deviation.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides an anti-seismic auxiliary structure for a continuous beam and a construction method thereof, which can provide temporary fixedly connection function during bridge construction and reduce interference caused by vibration to the bridge construction process.
According to an embodiment of the first aspect of the present invention, there is provided an earthquake-resistant assist structure for a continuous beam, including:
The bracket is fixed on the side surface of the bridge pier along the bridge direction;
the buffer support is an elastic piece, one end of the buffer support is used for being connected with the bridge pier or the bracket, and the other end of the buffer support is used for being connected with the bottom of the beam body;
a lateral distribution beam disposed on top of the carriage;
The bottom of the haunching beam is in butt joint with the top of the transverse distribution beam, and the top of the haunching beam is used for butt joint with the bottom of the wing plate of the beam body;
The screw thread reinforcing steel bars sequentially penetrate through the beam body, the haunching beam, the transverse distribution beam and the bracket and are fixed through nuts at two ends of the screw thread reinforcing steel bars.
According to an embodiment of the first aspect of the present invention, further, the number of the brackets is two, and the brackets are respectively fixed on two sides of the bridge pier along the bridge direction.
According to an embodiment of the first aspect of the present invention, further, the bracket includes a horizontal rod, an inclined rod and a plurality of support rods, one end of the horizontal rod is welded to one end of the inclined rod, the other end of the horizontal rod and the other end of the inclined rod are both connected to a side surface of the pier, and two ends of any one of the support rods are welded to the horizontal rod and the inclined rod, respectively, to form a triangular truss structure.
According to an embodiment of the first aspect of the present invention, further, the bracket further comprises a connection plate, the connection plate is used for being embedded into a side face of the pier and being welded with an internal steel bar of the pier, and the horizontal rod or the diagonal rod is welded with the connection plate to achieve anchoring with the pier.
According to an embodiment of the first aspect of the present invention, further, the horizontal rod, the diagonal rod and the support rod are all BLY100 steel rods.
According to an embodiment of the first aspect of the present invention, further, the buffer support is an HDR high damping rubber support.
According to an embodiment of the first aspect of the present invention, further, the transverse distribution beam is an i-beam.
According to an embodiment of the first aspect of the present invention, further, the haunched beam is a truss structure beam.
According to a second aspect of the present invention, there is provided a construction method for an earthquake-resistant assist structure for a continuous beam, including:
Prefabricating the bracket and the haunching beam in a factory, and reserving through holes for the threaded steel bars to pass through;
The bracket and the haunched beam are transported to a construction site, and the bracket is hoisted to the side face of the pier for installation;
Paving the transverse distribution beams on top of the brackets;
paving the haunching beams on the transverse distribution beams;
Installing the buffer support at the top of the bridge pier;
placing a beam body bottom die and a beam body side die on the haunched beam;
Binding steel bars on a bottom die of the beam body, installing a prestressed pipeline, pouring concrete, tensioning prestressed tendons and grouting to obtain a poured beam body, and fixing the beam body through the threaded steel bars;
performing system conversion after closure of the beam body, cutting off the twisted steel bars, and removing the beam body bottom die, the beam body side die and the transverse distribution beam;
installing a plurality of buffer supports at positions where the transverse distribution beams are originally arranged;
and (5) penetrating the beam body, the haunching beam and the bracket by using bolts, and fixing the haunched beam, the bracket and the bracket with each other, so that the construction is completed.
According to the second aspect of the embodiment of the invention, when the system is switched, the system is selected to be carried out at the local annual average temperature so as to reduce the influence of extreme air temperature on the construction.
The beneficial effects of the embodiment of the invention at least comprise: according to the invention, the influence of vibration on construction is reduced through the buffer support, and the bracket can be converted into an anti-seismic auxiliary structure to be permanently reserved at the bridge pier after the construction of the beam body is completed, so that the construction material is fully utilized, and the anti-seismic performance of the bridge body is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the invention, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic illustration of steps in an embodiment of a second aspect of the present invention;
FIG. 2 is a schematic illustration of steps in an embodiment of a second aspect of the present invention;
FIG. 3 is a schematic illustration of steps in an embodiment of a second aspect of the present invention;
FIG. 4 is a schematic illustration of steps in an embodiment of a second aspect of the present invention;
FIG. 5 is a three-dimensional modeling diagram of the present invention;
FIG. 6 is a graph of acceleration time course under the action of E1 and E2 earthquakes of security assessment wave 1;
FIG. 7 is a graph of acceleration time course under the action of E1 and E2 earthquakes of security assessment wave 2;
FIG. 8 is a graph of acceleration time course under the action of E1 and E2 earthquakes of security assessment wave 3;
FIG. 9 is a diagram showing internal force of a key section of a pier of a non-seismic isolation scheme under the action of an E2 earthquake;
FIG. 10 is a diagram of the internal force gauge, the bracket maximum shear stress gauge and the bolt maximum shear stress gauge of the key section of the bridge pier of the bracket shock insulation scheme under the action of an E2 earthquake;
FIG. 11 is a graph showing the second constant load internal force distribution of the partial structure of the center pillar.
Reference numerals: 100-bracket, 110-horizontal bar, 120-diagonal bar, 130-support bar, 140-connecting plate, 200-buffer support, 300-transverse distribution beam, 400-haunched beam, 500-screw rebar, 600-pier, 700-beam body, 800-beam body bottom die and 900-bolt.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 3, the seismic assistance structure for a continuous beam in the first aspect of the invention includes a bracket 100, a buffer bracket 200, a lateral distribution beam 300, a haunched beam 400, and a screw reinforcement 500. The bracket 100 is a main body structure of the seismic assistance structure for the continuous beam, and is used for supporting other components. The bracket 100 is fixed to the side of the bridge pier 600 in the bridge direction, and serves as an auxiliary support for the construction of the girder 700. The buffer support 200 is an elastic member, one end of which is connected with the pier 600 or the bracket 100, and the other end of which is connected with the bottom of the girder 700, for absorbing external shock, thereby reducing the influence of earthquake disasters on the construction process. The transverse distribution beam 300 is laid on top of the bracket 100, and is specifically an i-beam for uniformly distributing the pressure of the beam body 700 to the bracket 100, thereby reducing the stress concentration phenomenon caused by local stress. The haunched beam 400 is wedge-shaped and is a truss structure, the shape of the haunched beam is matched with the shape of the bottom of the wing plate of the beam body 700, so that a gap between the beam body 700 and the transverse distribution beam 300 is filled, the contact area between the beam body 700 and the anti-seismic auxiliary structure for the continuous beam is increased, and the support is more stable. The surface of the twisted steel 500 is provided with threads, and can be in threaded connection with an adaptive nut. The screw reinforcement 500 is screwed through nuts at both ends after sequentially penetrating the girder body 700, the haunched girder 400, the transverse distribution girder 300 and the bracket 100, thereby closely attaching the respective components and reducing the possibility of loosening.
Further, the number of brackets 100 is two, and the brackets are respectively fixed on two sides of the pier along the bridge direction, so that the bridge pier is suitable for middle pier beam construction.
Specifically, referring to fig. 1, the bracket 100 includes a horizontal bar 110, a diagonal bar 120, and a plurality of support bars 130. One end of the horizontal bar 110 is welded to one end of the diagonal bar 120, and the other end of the horizontal bar is connected to the side of the pier 600, so that the horizontal bar 110, the diagonal bar 120 and the pier 600 together form a stable triangle structure. In order to further improve the structural strength of the bracket 100, a plurality of support bars 130 are welded between the horizontal bars 110 and the diagonal bars 120. The two ends of any support bar 130 are welded to the horizontal bar 110 and the diagonal bar 120, and two adjacent support bars 130 form an acute angle therebetween, so as to form a triangular truss structure together.
Further, the bracket 100 further includes a connection plate 140 which is inserted into a side of the pier 600 and welded to an inner reinforcement of the pier 600, and is generally required to be buried in advance when the pier 600 is poured. The horizontal bar 110 or the diagonal bar 120 is welded to the connection plate 140, thereby achieving the anchoring with the pier 600.
Further, the horizontal bar 110, the diagonal bar 120 and the support bar 130 are bar members made of the BLY100 steel material. The BLY100 steel is a low yield point steel for earthquake resistance, and the low yield point has higher ductility, so that it is less likely to crack when subjected to vibration.
Specifically, the buffer mount 200 is an HDR high damping rubber mount, which damps and damps structural vibrations and noise by using the viscoelastic properties of the rubber itself, and when the structure vibrates, viscous internal friction between rubber molecular chains consumes part of vibration energy, so that part of the vibration energy is converted into thermal energy to be dissipated.
An embodiment of the second aspect of the present invention provides a construction method for an earthquake-resistant auxiliary structure for a continuous beam, including the steps of:
s1, prefabricating a bracket 100 and a haunching beam 400 in a factory, and reserving through holes for a screw steel bar 500 to pass through;
s2, transporting the bracket 100 and the haunched beams 400 to a construction site, and referring to FIG. 1, hoisting the bracket 100 to the side surface of the pier 600 for installation;
s3, paving a transverse distribution beam 300 on the top of the bracket 100;
s4, paving an armpit beam 400 on the transverse distribution beam 300;
S5, installing a buffer support 200 at the top of the bridge pier 600;
S6, referring to FIG. 2, a beam bottom die 800 and a beam side die are placed on the haunched beam 400;
s7, binding reinforcing steel bars on a beam body bottom die 800, installing a prestressed pipeline, pouring concrete, tensioning prestressed tendons and grouting to obtain a poured beam body 700, and fixing the beam body 700 through the threaded reinforcing steel bars 500 according to FIG. 3;
S8, performing system conversion after closure of the beam body 700, cutting off the twisted steel 500, and removing the beam body bottom die 800, the beam body side die and the transverse distribution beam 300;
S9, installing a plurality of buffer supports 200 at the positions where the transverse distribution beams 300 are originally arranged;
S10, bolts 900 are used for penetrating through the beam body 700, the haunched beam 400 and the bracket 100 and are mutually fixed, and the construction is completed.
The following illustrates the flow of an earthquake-proof experiment for the earthquake-proof auxiliary structure of the continuous beam:
(1) Three-dimensional modeling and determination of basic parameters
The basic intensity of earthquake in the engineering example site is set to be VIII degrees, the peak acceleration of earthquake motion is set to be 0.2g, and the earthquake-proof measures are set according to IX degrees. According to the preliminary design scheme of the prestressed concrete continuous beam of the bridge, a Midas/Civil 2020 finite element program is adopted, a three-dimensional finite element dynamic calculation model is established for earthquake resistance and earthquake reduction and isolation performance analysis, the calculation model takes the along-bridge direction as an X axis, the transverse-bridge direction as a Y axis and the vertical-bridge direction as a Z axis. The full bridge has 273 nodes and 268 units, and the main beam, the bridge pier and the bracket are all simulated by using space beam units. Referring to fig. 5, the pier is left pier, middle pier 1, middle pier 2 and right pier in sequence from left to right.
In order to verify the energy consumption, shock insulation and shock absorption effects of the bracket, the top of the middle pier is fixedly connected with the upper structure along the forward bridge direction by adopting a low yield strength H-shaped steel bracket, the transverse bridge direction is 2 truss, and the middle pier and the side piers are respectively provided with high damping rubber supports HDR (I) -d1170x413-G1.0. Wherein 2 middle piers are placed on the top, 4 middle piers are placed on the bracket, and 2 side piers are placed.
The bracket is welded by I-steel, and is made of BLY100, with the height of 756mm, the width of 700mm, the thickness of web plate of 24mm and the thickness of top plate and bottom plate of 28mm.
(2) Seismic wave input
The basic intensity of earthquake in the project engineering sites is VIII degrees, the peak acceleration of earthquake motion is 0.2g, and the site types are IV types. In the earthquake-proof analysis, 3 earthquake safety evaluation waves are selected as input earthquake waves for earthquake response time course analysis. The safety evaluation report shows three acceleration time course curves under the action of E1 and E2 earthquakes, and the upper graph is an E1 action curve, and the lower graph is an E2 action curve, referring to FIGS. 6-8. Wherein, the peak value of the acceleration of the E1 earthquake is 0.11g, and the peak value of the acceleration of the E2 earthquake is 0.33g.
(3) Seismic response calculation
In the test calculation process, the rigidity of the structure under E1 earthquake is found to basically meet the earthquake-proof requirement, so that a dynamic time-course analysis method is adopted for the non-earthquake-proof scheme and the bracket earthquake-proof scheme respectively, the earthquake-proof design and the test calculation under the E2 earthquake effect are carried out under the action of the 3 earthquake waves, and whether the bracket earthquake-proof design and the bracket earthquake-proof effect are suitable for being adopted or not is checked through the comparison analysis of the internal force results of the corresponding non-earthquake-proof bridge.
(3.1) Results of time course analysis of non-seismic isolation scheme
Under the action of E2 earthquake, for a non-seismic isolation scheme, a linear time-course analysis method is adopted, and the key section earthquake response of each pier is referred to in table 1 of FIG. 9.
(3.2) Results of time course analysis of the bracket shock insulation scheme
For the bracket shock insulation scheme, a nonlinear time-course analysis method is adopted, a Newmark direct integration method is adopted in the nonlinear time-course analysis method, and Rayleigh damping is adopted in damping calculation. Under the action of E2 earthquake, the key section earthquake response of each bridge pier of the bracket earthquake isolation scheme can be obtained, and the following steps are defined: the damping coefficient=the internal force of the bracket damping and insulation scheme/the internal force of the non-damping and insulation scheme, compared with table 3, can obtain the damping coefficient of the bracket damping and insulation system with reference to table 2 of fig. 10, wherein the damping effect of the bracket in the forward bridge direction middle pier is between 83 and 92 percent, the damping effect of the side pier is between 76 and 81 percent, and the bracket damping and insulation system effect is obvious.
(3.3) Bracket checking calculation
Referring to table 3 of fig. 10, the in-carriage force results indicate that: under the action of E2 earthquake, the shearing stress of the bracket I-steel rod piece is 316-377 MPa, at the moment, the mild steel enters the yielding stage and is converted into a damping energy consumption component, if the damping energy consumption component is severely damaged under the action of the earthquake, the damping energy consumption component is repaired after the earthquake.
(3.4) Bolt inspection
The shearing force applied to the high-damping rubber shock insulation support at the top of the bracket is used as a reference for the shearing resistance checking calculation of the adjacent fixing bolts. Referring to table 4 of fig. 10, the bolt internal force results indicate that: under the action of E2 earthquake, the shear stress of the bolt is 191-240 MPa, and the yield strength of the bolt is 300MPa which is lower than that of a 5.6-level common bolt M8.0, which indicates that the bolt yields but cannot be damaged, and the internal force of the upper structure can be transmitted to the bracket structure.
(3.5) Constant load static force checking calculation
And taking the continuous beam near the middle pier as an object, and analyzing the influence of the bracket structure on the structural constant load internal force under the action of the second-stage constant load (uniform load). Referring to fig. 11, under the action of the second-phase uniform load, the pivot position of the continuous beam bears a large hogging moment, and the continuous Liang Hengzai stress is adjusted by the bracket structure, so that the original single-pivot stress is changed into the 3-pivot stress. Under the condition of no bracket, the peak hogging moment of the 'support 1' of the middle pier of the continuous steel truss girder is 47392 kN.m, after the permanent bracket structure is arranged, the hogging moment of the 'support 1' is reduced to 19709 kN.m, and the reduction of the hogging moment reaches 58.4%, which indicates that the bracket structure has the effect of reducing the peak value of the constant load hogging moment of the continuous girder.
(3.6) Temperature Effect checking
Under the action of E1 earthquake, the continuous beam is fixedly connected with the bridge pier through common bolts, the bolts yield but are not destroyed, the continuous rigid frame structure type is characterized in that the influence of temperature force is considered, and temperature load is applied: the temperature is raised to 25 ℃ and the temperature is lowered to-25 ℃ as a whole. Proved by inspection, the temperature stress is mainly concentrated at the pier beam consolidation position, the maximum stress value is positioned at the bracket, the maximum tensile stress of the bracket is 53MPa when the temperature is raised to 25 ℃ wholly, the bracket stress distribution under the effect of wholly cooling is opposite to the wholly temperature, and the bracket does not yield under the effect of temperature force.
(4) Conclusion(s)
According to the analysis, the triangular soft steel brackets are arranged on the middle piers, so that bending moment of the pier tops can be reduced under the action of constant load, and under the action of an earthquake, longitudinal and transverse internal forces of the piers are reduced, wherein the damping effect of the bridge to the middle piers can reach 83-92%, the damping effect of the side piers reaches 76-81%, the damping soft steel enters the yielding stage, and the bolts also enter the yielding stage but are not damaged. The invention can effectively reduce the earthquake response of the bridge pier and meet the engineering requirements of earthquake isolation design.
While the preferred embodiments of the present application have been illustrated and described, the present application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (9)
1. A construction method of an earthquake-resistant auxiliary structure for a continuous beam, characterized by comprising an earthquake-resistant auxiliary structure for a continuous beam;
The seismic assistance structure for a continuous beam includes:
The bracket is fixed on the side surface of the bridge pier along the bridge direction;
the buffer support is an elastic piece, one end of the buffer support is used for being connected with the bridge pier or the bracket, and the other end of the buffer support is used for being connected with the bottom of the beam body;
a lateral distribution beam disposed on top of the carriage;
The bottom of the haunching beam is in butt joint with the top of the transverse distribution beam, and the top of the haunching beam is used for butt joint with the bottom of the wing plate of the beam body;
the screw thread steel bars sequentially penetrate through the beam body, the haunching beam, the transverse distribution beam and the bracket and are fixed through nuts at two ends of the screw thread steel bars;
for the seismic assistance structure for a continuous beam, the construction method of the seismic assistance structure for a continuous beam includes the steps of:
Prefabricating the bracket and the haunching beam in a factory, and reserving through holes for the threaded steel bars to pass through;
The bracket and the haunched beam are transported to a construction site, and the bracket is hoisted to the side face of the pier for installation;
Paving the transverse distribution beams on top of the brackets;
paving the haunching beams on the transverse distribution beams;
Installing the buffer support at the top of the bridge pier;
placing a beam body bottom die and a beam body side die on the haunched beam;
Binding steel bars on a bottom die of the beam body, installing a prestressed pipeline, pouring concrete, tensioning prestressed tendons and grouting to obtain a poured beam body, and fixing the beam body through the threaded steel bars;
performing system conversion after closure of the beam body, cutting off the twisted steel bars, and removing the beam body bottom die, the beam body side die and the transverse distribution beam;
installing a plurality of buffer supports at positions where the transverse distribution beams are originally arranged;
and (5) penetrating the beam body, the haunching beam and the bracket by using bolts, and fixing the haunched beam, the bracket and the bracket with each other, so that the construction is completed.
2. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: the number of the brackets is two, and the brackets are respectively fixed on two sides of the bridge pier along the bridge direction.
3. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: the bracket comprises a horizontal rod, an inclined rod and a plurality of supporting rods, one end of the horizontal rod is welded with one end of the inclined rod, the other end of the horizontal rod is connected with the other end of the inclined rod and the side face of the pier, and two ends of any supporting rod are welded to the horizontal rod and the inclined rod respectively to form a triangular truss structure.
4. A construction method for an earthquake-resistant auxiliary structure for a continuous beam according to claim 3, wherein: the bracket also comprises a connecting plate, wherein the connecting plate is used for being embedded into the side face of the pier and welded with the internal reinforcing steel bar of the pier, and the horizontal rod or the inclined rod is welded with the connecting plate so as to realize anchoring with the pier.
5. A construction method for an earthquake-resistant auxiliary structure for a continuous beam according to claim 3, wherein: the horizontal rod, the inclined rod and the supporting rod are all BLY100 steel rods.
6. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: the buffer support is an HDR high damping rubber support.
7. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: the transverse distribution beam is an I-shaped steel beam.
8. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: the haunching beam is a truss structure beam.
9. The construction method for the seismic assistance structure for a continuous beam according to claim 1, characterized in that: when the system is switched, the system is selected to be carried out at the local annual average temperature so as to reduce the influence of extreme air temperature on construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN204081077U (en) * | 2014-09-15 | 2015-01-07 | 衡水鑫盛达新材料科技有限公司 | A kind of high-damp rubber support |
| CN110714416A (en) * | 2019-10-25 | 2020-01-21 | 中国一冶集团有限公司 | BIM-based temporary consolidation construction structure and method for large cantilever bridge body |
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| CN205775888U (en) * | 2016-05-13 | 2016-12-07 | 中铁十七局集团第二工程有限公司 | A kind of supporting structure of auxiliary boom beam construction |
| CN208717718U (en) * | 2018-07-20 | 2019-04-09 | 中铁第一勘察设计院集团有限公司 | A kind of bridge three-dimensional seismic isolation device |
| CN210395119U (en) * | 2019-07-18 | 2020-04-24 | 中国水利水电第八工程局有限公司 | Face novel bridge beam supports frame that combines forever |
| CN113152283B (en) * | 2019-10-21 | 2022-06-10 | 宁波市政工程建设集团股份有限公司 | Construction method of large-crotch-diameter supporting system of small box girder type hidden cover beam prefabricated on road and bridge |
| CN214783307U (en) * | 2021-01-21 | 2021-11-19 | 中国水电建设集团十五工程局有限公司 | Cast-in-place support of case roof beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204081077U (en) * | 2014-09-15 | 2015-01-07 | 衡水鑫盛达新材料科技有限公司 | A kind of high-damp rubber support |
| CN110714416A (en) * | 2019-10-25 | 2020-01-21 | 中国一冶集团有限公司 | BIM-based temporary consolidation construction structure and method for large cantilever bridge body |
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