CN213926837U - Variable friction force and multi-stage energy consumption based damper and beam column node - Google Patents
Variable friction force and multi-stage energy consumption based damper and beam column node Download PDFInfo
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- CN213926837U CN213926837U CN202022077558.3U CN202022077558U CN213926837U CN 213926837 U CN213926837 U CN 213926837U CN 202022077558 U CN202022077558 U CN 202022077558U CN 213926837 U CN213926837 U CN 213926837U
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- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims description 3
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- 238000013016 damping Methods 0.000 description 11
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- 229910000734 martensite Inorganic materials 0.000 description 2
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- 230000035939 shock Effects 0.000 description 2
- 101100257136 Caenorhabditis elegans sma-5 gene Proteins 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
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Abstract
The utility model provides a attenuator and beam column node based on variable frictional force and multistage energy consumption. The damper comprises a separated outer sleeve, a piston inner cylinder, a cushion block, a friction plate, a vertical SMA bolt, a horizontal SMA rod, a guide rail sliding block, an end plate and a hinged connection plate. The piston inner cylinder penetrates into the outer sleeve. The fixed friction block, the upper cushion block and the lower cushion block are arranged in the inner cavity of the outer sleeve. And the extending end of the piston inner cylinder is welded with a connecting plate with a hinge. The horizontal SMA rods are arranged in a gap between the piston inner cylinder and the outer sleeve. And two ends of the horizontal SMA rod penetrate through the anchoring holes of the end plate I and the end plate II and are connected with the end plate I or the end plate II through an anchorage device. The damper presents an obvious energy consumption time sequence, presents an obvious multi-energy consumption stage characteristic and has self-resetting capability. After earthquake, under the action of the restoring force of the horizontal SMA rod, the damper can be restored to be close to the initial state, so that the repair cost and difficulty of the structure caused by residual deformation are greatly reduced.
Description
Technical Field
The utility model relates to a structural engineering field, in particular to attenuator based on variable frictional force and multistage energy consumption.
Background
Frictional damping is a common stable, efficient and repeatable damping mode and is widely used in vibration control in the field of structural engineering. The friction damper generally comprises a friction surface with a certain friction coefficient and a certain pre-pressure, and the friction surface can be driven to slide relatively by external force after the external force needs to overcome static friction. For a common friction device, once designed, the friction force or damping it provides is constant, namely: such frictional damping appears rectangular on the hysteresis curve. But there are many points to be perfected in operation. Such dampers exhibit a zero stiffness slip condition once the static friction of the friction device is overcome, for example.
However, damping devices that are more desirable in structural applications should exhibit a linear increasing trend in loading, namely: the damper always contributes a certain stiffness to the member or node or structure, which also makes the reinforced structure more suitable for seismic actions at different seismic levels, i.e.: the structure is sensitive to strong and weak vibration, so that vibration control and energy consumption are better. At present, there are also some studies on variable friction damping. The basic principle is to change the positive stress between the friction surfaces to change the magnitude of the friction force. The specific practice is determined by the structure of the designer. Some researchers have proposed, based on interdisciplinary disciplines, to add semi-controlled elements, such as electromagnetic and piezoelectric elements, to friction devices by varying the magnitude of the current and thus adjusting the friction force; there are also conventional mechanical movements based on which the positive pressure is changed directly during the movement to achieve a continuous increase in friction. The latter typically achieves a linear or non-linear increase in positive stress during sliding based on the friction surface being a curved surface or a ramped surface friction mechanism. However, the variable friction mechanism described above also has a problem, such as a linearly increasing friction device, in that the main parameter for determining the rigidity of the friction plate after sliding is the disc spring rigidity required for connecting the high-strength bolts of the friction plate. The stiffness of the disc spring is a constant value in the whole stress process, so that the high-stiffness disc spring expected in the initial loading stage (below the moderate shock) is not necessarily suitable for the later loading stage (above the moderate shock), and particularly when the stiffness of the whole system is expected in the later loading stage, the self-vibration period of the system is prolonged by a sharp reduction mode, and the earthquake response is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a attenuator and beam column node based on variable frictional force and multistage energy consumption to solve the problem that exists among the prior art.
The technical scheme who adopts for realizing the utility model aims at so, a attenuator based on variable frictional force and multistage energy consumption is such, including outer sleeve, piston inner tube, two friction pack, a plurality of vertical SMA screw rods and a plurality of horizontal SMA stick.
The piston inner cylinder is integrally a rectangular tube. And an upper cushion block and a lower cushion block are respectively arranged on the upper surface and the lower surface of the inner piston cylinder. And one sides of the upper cushion block and the lower cushion block, which are opposite to each other, are respectively provided with a friction assembly to form an upper friction assembly and a lower friction assembly. The friction assembly comprises a fixed friction block and a vertical sliding friction block. And the fixed friction block is fixedly connected with the cushion block. The fixed friction block and the vertical sliding friction block are meshed at the contact surface. Waist-shaped holes for the vertical SMA screws to penetrate are formed in the upper cushion block, the lower cushion block and the fixed friction block. And a round hole for the vertical SMA screw to pass through is formed in the vertical slidable friction block. The vertical SMA screw rod sequentially penetrates through the upper friction assembly, the upper cushion block, the piston inner cylinder, the lower cushion block and the lower friction assembly. And the upper end and the lower end of the vertical SMA screw are fastened by nuts. And the side wall of the piston inner cylinder is also provided with a guide rail sliding block I and a guide rail sliding block II. The sizes of the guide rail sliding block I and the guide rail sliding block II are matched with the size of the inner cavity of the outer sleeve.
The whole outer sleeve is a rectangular pipe. The outer sleeve is shorter than the inner piston barrel. And a vertical sliding friction block accommodating notch is formed in the pipe wall of the outer sleeve. The piston inner cylinder penetrates into the outer sleeve. The fixed friction block, the upper cushion block and the lower cushion block are arranged in the inner cavity of the outer sleeve. The vertical sliding friction block is embedded into the accommodating notch. The opening parts at the two ends of the outer sleeve are plugged by an end plate I and an end plate II. And the end plate I is provided with a through hole matched with the shape of the piston inner cylinder. And the end plate I and the end plate II are provided with anchoring holes. The extending end of the piston inner cylinder abuts against the end plate II, and the extending end of the piston inner cylinder extends out of the outer sleeve from the through hole of the end plate I. And the extending end of the piston inner cylinder is welded with a connecting plate with a hinge. The horizontal SMA rods are arranged in a gap between the piston inner cylinder and the outer sleeve. And two ends of each horizontal SMA rod penetrate through the anchoring holes of the end plate I and the end plate II and are connected with the end plate I or the end plate II through an anchorage device. And notches for the horizontal SMA rods to penetrate are formed in the guide rail sliding block I and the guide rail sliding block II.
Furthermore, the contact surfaces of the fixed friction block and the vertical sliding friction block are divided into a middle wedge-shaped friction surface and two end plane friction surfaces. The fixed friction block and the vertical sliding friction block are provided with wedge-shaped bosses or grooves which are connected one by one at the middle wedge-shaped friction surface. The lug boss is meshed with the groove.
Furthermore, the guide rail sliding block I and the guide rail sliding block II are in a cross shape.
Furthermore, the SMA screw and the horizontal SMA rod are made of nickel-titanium memory alloy.
Further, the outer sleeve is formed by welding in a sectional mode. The outer sleeve comprises a closing plate section and sleeve sections arranged at two ends of the closing plate section. The sleeve section is a rectangular pipe. The closing plate section comprises two channel steels with opposite notches. The two channel steel bags form a containing gap. And a connecting plate is further arranged on the outer wall of one end of the outer sleeve, which is far away from the hinged connecting plate.
Further, the friction coefficient of the contact surface of the fixed friction block and the vertical sliding friction block is more than 0.25.
The utility model discloses still disclose a beam column node, including I-steel roof beam, frame post, T template and attenuator.
And the lower flange of the I-shaped steel beam is welded with a fixed end plate. The flange of the frame column is welded with a shear-resistant connecting plate and a hinged support plate.
The I-shaped steel beam is connected with the frame column through the shear-resistant connecting plate, the T-shaped plate and the damper.
And the web plate of the I-shaped steel beam is connected with the shear-resistant connecting plate through shear-resistant bolts.
The T-shaped plate comprises a vertical plate and a horizontal plate arranged on one side of the vertical plate. And the vertical plate of the T-shaped plate is fixedly connected with the flange of the frame column through a high-strength bolt. And the horizontal plate of the T-shaped plate is fixedly connected with the upper flange of the I-shaped steel beam through a high-strength bolt.
The damper adopts any one of the dampers based on variable friction force and multi-stage energy consumption. The damper is arranged below the lower flange of the I-shaped steel beam. The hinged connecting plate is hinged with the hinged support plate through a pin. And one end of the outer sleeve, which is far away from the hinged connecting plate, is welded with the fixed end plate.
Furthermore, stiffening ribs are arranged on the I-shaped steel beam and the frame column.
The technical effects of the utility model are undoubted:
A. the damper presents an obvious energy consumption time sequence, presents an obvious multi-energy consumption stage characteristic and has self-resetting capability;
B. the friction device is optimized, and the linear sliding friction damping is realized by utilizing the phase change characteristic of the vertical SMA bolt, so that the anti-seismic device is more suitable for the anti-seismic requirement of the structure;
C. each main part is easy to replace, and when the design standard is changed or the structural requirement of an owner is improved, the existing damper can be flexibly changed to meet the higher performance requirement;
D. after earthquake or after unloading, the damper can be restored to be close to the initial state under the action of the restoring force of the horizontal SMA rod, so that the repairing cost and difficulty of the structure caused by residual deformation are greatly reduced.
Drawings
FIG. 1 is a schematic view of a damper construction;
FIG. 2 is an exploded view of the damper;
FIG. 3 is a cross-sectional view of the damper;
FIG. 4 is a schematic view of the outer sleeve;
FIG. 5 is a schematic view of the piston inner barrel assembly;
FIG. 6 is a schematic view of a friction assembly;
FIG. 7 is a schematic view of a vertical SMA screw;
FIG. 8 is a schematic view of a horizontal SMA rod;
FIG. 9 is a schematic view of end plate I;
FIG. 10 is a schematic view of end plate II;
FIG. 11 is a schematic view of a self-resetting energy-dissipating beam-column joint;
FIG. 12 is a typical hysteresis rule for friction plates of a variable friction mechanism;
typical hysteresis rules for the damper of figure 13.
In the figure: the anti-shearing device comprises an outer sleeve 1, a channel steel 102, an accommodating notch 103, a piston inner cylinder 2, an upper cushion block 3, a lower cushion block 30, a vertical slidable friction block 401, a fixed friction block 402, a vertical SMA screw rod 5, a horizontal SMA rod 6, a guide rail slide block I7, a guide rail slide block II 70, an end plate I8, an end plate II 9, a connecting plate 10, a hinged connecting plate 11, an I-shaped steel beam 12, a fixed end plate 14, a hinged support plate 16, a frame column 18, a shearing-resisting connecting plate 19 and a T-shaped plate 21.
Detailed Description
The present invention will be further described with reference to the following examples, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and modifications can be made without departing from the technical spirit of the invention and according to the common technical knowledge and conventional means in the field, and all shall be included in the scope of the invention.
Example 1:
referring to fig. 1 to 3, the present embodiment discloses a damper based on variable friction and multi-stage energy consumption, which includes an outer sleeve 1, a piston inner cylinder 2, two friction assemblies, a vertical SMA screw 5 and a horizontal SMA rod 6.
Referring to fig. 5, the piston inner cylinder 2 is a rectangular tube as a whole. The upper surface and the lower surface of the piston inner cylinder 2 are respectively provided with an upper cushion block 3 and a lower cushion block 30. The upper cushion block 3 and the lower cushion block 30 are arranged in parallel at intervals. The piston inner cylinder 2 is sandwiched between an upper cushion block 3 and a lower cushion block 30. And the back sides of the upper cushion block 3 and the lower cushion block 30 are respectively provided with a friction assembly to form an upper friction assembly and a lower friction assembly. Referring to fig. 6, the friction assembly includes a fixed friction block 402 and a vertically slidable friction block 401. The fixed friction block 402 is fixedly connected with the cushion block 3. The fixed friction block 402 and the vertical sliding friction block 401 are engaged at the contact surface to form a friction assembly together. The contact surfaces of the fixed friction block 402 and the vertical slidable friction block 401 are divided into a middle wedge-shaped friction surface and two end plane friction surfaces. The fixed friction block 402 and the vertical slidable friction block 401 are provided with wedge-shaped bosses or grooves connected one by one at the middle wedge-shaped friction surface. The lug boss is meshed with the groove. The friction coefficient of the contact surface of the fixed friction block 402 and the vertical sliding friction block 401 is more than 0.25.
Waist-shaped holes for the vertical SMA screws 5 to pass through are formed in the upper cushion block 3, the lower cushion block 30 and the fixed friction block 402. And a round hole for the vertical SMA screw 5 to pass through is formed in the vertical slidable friction block 401. A schematic of a vertical SMA screw 5 is shown in fig. 7.
The vertical SMA screw 5 sequentially penetrates through the upper friction assembly, the upper cushion block 3, the piston inner cylinder 2, the lower cushion block 30 and the lower friction assembly. And the upper end and the lower end of the vertical SMA screw 5 are fastened by nuts. The nut applies pretightening force to generate positive pressure between the fixed friction block 402 and the vertical slidable friction block 401. And the side wall of the piston inner cylinder 2 is also provided with a guide rail sliding block I7 and a guide rail sliding block II 70. The sizes of the guide rail sliding blocks I7 and the guide rail sliding blocks II 70 are matched with the size of the inner cavity of the outer sleeve 1, so that the relative positions and the relative movement directions of the piston inner cylinder 2 and the outer sleeve 1 are ensured. The guide rail sliding block I7 and the guide rail sliding block II 70 are in a cross shape.
The outer sleeve 1 is a rectangular pipe as a whole. The outer sleeve 1 is shorter than the inner piston cylinder 2. Referring to fig. 4, the outer sleeve 1 is formed by welding in a sectional manner. The outer sleeve 1 comprises a closing plate section and sleeve sections arranged at two ends of the closing plate section. The sleeve section is a rectangular pipe. The cover plate segment includes two channel segments 102 with opposing notches. The two channel steel 102 sandwich the accommodating notch 103. And a connecting plate 10 is further arranged on the outer wall of one end of the outer sleeve 1, which is far away from the hinged connecting plate 11. The piston inner cylinder 2 penetrates into the outer sleeve 1. The outer sleeve 1, the piston inner cylinder 2, the guide rail sliding block I7 and the guide rail sliding block II 70 form a piston structure. The fixed friction block 402, the upper cushion block 3 and the lower cushion block 30 are arranged in the inner cavity of the outer sleeve 1. The vertical slidable friction block 401 is embedded in the accommodating notch 103. When the piston cylinder 2 is pulled or pressed, the vertical slidable friction block 401 is pressed when the vertical slidable friction block 402 with the slotted hole of the sliding chute, which is fixed on the cushion block 3 in a coordinated manner, slides to one side. The horizontal degree of freedom of the vertical slidable friction block 401 is limited by the outer sleeve 1, while the vertical degree of freedom is not limited, so that the vertical movement is possible while the vertical SMA bolt 5 is elongated in tension, which in turn causes the positive stress of the friction surfaces of the fixed friction block 402 and the vertical slidable friction block 401 to increase and further improves the friction force. The variable friction mechanism of the fixed friction block 402 and the vertical slidable friction block 401 can still provide a certain axial rigidity for the damper in the sliding stage, and the axial rigidity is related to the linear rigidity of the vertical SMA bolt 5 and the contact surface of the fixed friction block 402 and the vertical slidable friction block 401. In the actual production, can adjust according to actual demand is nimble. Referring to fig. 12, by optimally designing the contact surfaces of the fixed friction block 402 and the vertical slidable friction block 401 and the diameter of the vertical SMA 5, it can be realized that the hysteresis curve of the friction device has only a small amount of compressive strength in the second quadrant or the fourth quadrant. Referring to fig. 13, only a small elastic restoring force can completely restore the damper.
The opening parts at two ends of the outer sleeve 1 are plugged by an end plate I8 and an end plate II 9. And a through hole matched with the shape of the piston inner cylinder 2 is formed in the end plate I8. And anchor holes are formed in the end plate I8 and the end plate II 9. The extending end of the piston inner cylinder 2 abuts against the end plate II 9, and the extending end of the piston inner cylinder extends out of the outer sleeve 1 from the through hole of the end plate I8. The I7 of guide rail pushes against the inner side of the I8 of the end plate, and the II 70 of guide rail pushes against the inner side of the II 9 of the end plate. And the extending end of the piston inner cylinder 2 is welded with a connecting plate 11 with a hinge. The horizontal SMA rods 6 are arranged in the gap between the piston inner cylinder 2 and the outer sleeve 1. Two ends of each horizontal SMA rod 6 penetrate through the anchoring holes of the end plates I8 and II 9 and are connected with the end plates I8 or II 9 through an anchorage device, so that the piston inner cylinder 2 and the outer sleeve 1 are pre-pressed together. And the end plate I8 and the end plate II 9 are assembled with the outer sleeve 1 in a separated contact manner through the pretightening force of the horizontal SMA rod 6. The damper is allowed to separate from one side of the outer sleeve when the damper is compressed or pulled, so that the horizontal SMA rod 6 is extended to store restoring force. When the damper is pressed, after static friction of the friction assembly and prestress of the horizontal SMA rod 6 are overcome, the right side of the piston inner cylinder 2 contacts and presses the end plate II 9, so that the end plate II 9 is separated from the outer sleeve 1, and the horizontal SMA rod 6 is stretched. And notches for the horizontal SMA rods 6 to penetrate are formed in the guide rail sliding block I7 and the guide rail sliding block II 70. A schematic of a horizontal SMA rod is shown in fig. 8.
It is worth noting that the present embodiment has significant effects in terms of both stiffness and energy consumption. Stiffness aspect: in terms of a friction mechanism, the present embodiment optimizes the friction assembly and achieves linear sliding friction damping by utilizing the phase change characteristics of the vertical SMA bolt 5. Friction device based on two linear friction damping is applicable to the antidetonation demand of structure more, promptly: under medium and large earthquakes, more lateral stiffness is provided, the lateral movement of the structure is controlled, and under medium and large earthquakes, the structure period can be prolonged due to sharp reduction of the frictional damping stiffness, so that the earthquake response of the structure is reduced, and the structure is protected. At the level of the damper, the time sequence of the horizontal SMA rods 6 entering the phase change is consistent with that of the vertical SMA bolts 5, so that the damper also presents a linear self-resetting flag-shaped command curve consistent with a friction plate after overcoming the static friction of the friction plate. In the aspect of energy consumption: under normal use load (such as wind load), the damper only generates tiny elastic deformation under the static friction force of the friction plate and the pretightening force of the SMA rod, the damper does not consume energy at the moment, under small to medium earthquakes, the damper only utilizes linear variable friction damping to consume energy, under medium to large earthquakes, the damper cooperates with the phase change of the SMA bolt and the SMA rod to consume energy in a mixed mode, the energy consumption characteristic of the damper under strong earthquakes is further optimized, and when the damper is used for a structure, expected vast number of nonlinear deformations are concentrated in the damper, and main components of the structure maintain elasticity.
Example 2:
the embodiment discloses a basic damper based on variable friction and multi-stage energy consumption, which comprises an outer sleeve 1, a piston inner sleeve 2, two friction assemblies, a vertical SMA screw rod 5 and a horizontal SMA rod 6.
The piston inner cylinder 2 is integrally a rectangular tube. The upper surface and the lower surface of the piston inner cylinder 2 are respectively provided with an upper cushion block 3 and a lower cushion block 30. And the back sides of the upper cushion block 3 and the lower cushion block 30 are respectively provided with a friction assembly to form an upper friction assembly and a lower friction assembly. The friction assembly includes a fixed friction block 402 and a vertically slidable friction block 401. The fixed friction block 402 is fixedly connected with the cushion block 3. The fixed friction block 402 and the vertical slidable friction block 401 are engaged at the contact surface. Waist-shaped holes for the vertical SMA screw rods 5 to pass through are formed in the upper cushion block 3, the lower cushion block 30 and the fixed friction block 402. And a round hole for the vertical SMA screw 5 to pass through is formed in the vertical slidable friction block 401. The vertical SMA screw 5 sequentially penetrates through the upper friction assembly, the upper cushion block 3, the piston inner cylinder 2, the lower cushion block 30 and the lower friction assembly. And the upper end and the lower end of the vertical SMA screw 5 are fastened by nuts. And the side wall of the piston inner cylinder 2 is also provided with a guide rail sliding block I7 and a guide rail sliding block II 70. The sizes of the guide rail sliding blocks I7 and the guide rail sliding blocks II 70 are matched with the size of the inner cavity of the outer sleeve 1.
The outer sleeve 1 is a rectangular pipe as a whole. The outer sleeve 1 is shorter than the inner piston cylinder 2. The pipe wall of the outer sleeve 1 is provided with a vertical sliding friction block accommodating notch 103. The piston inner cylinder 2 penetrates into the outer sleeve 1. The outer sleeve 1, the piston inner cylinder 2, the guide rail sliding block I7 and the guide rail sliding block II 70 form a piston structure. The fixed friction block 402, the upper cushion block 3 and the lower cushion block 30 are arranged in the inner cavity of the outer sleeve 1. The vertical slidable friction block 401 is embedded in the accommodating notch 103. The opening parts at two ends of the outer sleeve 1 are plugged by an end plate I8 and an end plate II 9. Referring to fig. 9 and 10, the end plate i 8 is provided with a through hole matching with the shape of the piston inner cylinder 2. And anchor holes are formed in the end plate I8 and the end plate II 9. The extending end of the piston inner cylinder 2 abuts against the end plate II 9, and the extending end of the piston inner cylinder extends out of the outer sleeve 1 from the through hole of the end plate I8. The I7 of guide rail pushes against the inner side of the I8 of the end plate, and the II 70 of guide rail pushes against the inner side of the II 9 of the end plate. And the extending end of the piston inner cylinder 2 is welded with a connecting plate 11 with a hinge. The horizontal SMA rods 6 are arranged in the gap between the piston inner cylinder 2 and the outer sleeve 1. Two ends of each horizontal SMA rod 6 penetrate through the anchoring holes of the end plates I8 and II 9 and are connected with the end plates I8 or II 9 through an anchorage device, so that the piston inner cylinder 2 and the outer sleeve 1 are pre-pressed together. And notches for the horizontal SMA rods 6 to penetrate are formed in the guide rail sliding block I7 and the guide rail sliding block II 70.
It is worth noting that in the process of gradual transformation of SMA (Shape Memory Alloy) from austenite to martensite driven by stress, SMA materials enter the "yield" stage of nominal class such as steel, achieving a sharp reduction in stiffness, but can return to almost zero residual strain after unloading. In this embodiment, the SMA screw 5 and the horizontal SMA rod 6 are made of a nickel titanium memory alloy.
Example 3:
the performance of the steel structure node plays a crucial role in a structural system. This embodiment can form the opening to unbonded back stretch-draw beam column node and based on intelligent material SMA end plate formula beam column node at the rotation in-process, and then leads to frame expansion effect and causes the problem of roof beam upper flange tip floor early failure.
Referring to fig. 11, the present embodiment discloses a beam-column joint, which includes an i-beam 12, a frame column 18, a T-shaped plate 21, and a damper.
The fixed end plate 14 is welded to the lower flange of the I-shaped steel beam 12. The flanges of the frame column 18 are welded with a shear connection plate 19 and a hinged support plate 16. The shear-resistant connecting plate 19 is provided with a plurality of long slotted holes. The web plate of the I-shaped steel beam 12 is provided with a plurality of bolt holes. Stiffening ribs are arranged on the I-shaped steel beam 12 and the frame column 18.
The i-beam 12 is connected to the frame column 18 by a shear connection plate 19, a T-shaped plate 21 and a damper.
The web plate of the I-shaped steel beam 12 is connected with the shear connection plate 19 through shear bolts.
The T-shaped plate 21 comprises a vertical plate and a horizontal plate arranged on one side of the vertical plate. The vertical plate of the T-shaped plate 21 is fixedly connected with the flange of the frame column 18 through a high-strength bolt. And the horizontal plate of the T-shaped plate 21 is fixedly connected with the upper flange of the I-shaped steel beam 12 through a high-strength bolt.
The damper used was the variable friction and multi-stage energy consumption based damper described in example 1. The damper is arranged below the lower flange of the I-shaped steel beam 12. The hinged connecting plate 11 is hinged with a hinged support plate 16 through a pin. The end of the outer sleeve 1 away from the hinged connecting plate 11 is welded with a fixed end plate 14.
It should be noted that in the present embodiment, the shear connection plate 19 and the T-shaped plate 21 transmit node shear force, and the rotational stiffness and the energy dissipation characteristics of the node are mainly provided by the axial stiffness of the damper and the multi-stage energy dissipation mechanism. In the stress process of the beam-column joint, the following three stages can be realized: in the first stage, under normal use loads (e.g., wind loads), the node is similar to a conventional rigid node until the static friction of the damper friction plates and the pretension of the horizontal SMA rods are not overcome. In the second stage, under the condition of small to medium earthquakes, after the static friction force is overcome, the rigidity of the node is composed of the horizontal SMA rod line rigidity and the equivalent axial rigidity provided by a variable friction mechanism, at the moment, the rotational rigidity of the node is still very large, the structure lateral movement can be effectively controlled, and the energy input into the system at the stage is mainly dissipated by the friction mechanism of the friction plate. And in the third stage, under the middle and large earthquakes, the horizontal SMA rods and the vertical SMA bolts sequentially enter a process of austenite transformation martensite driven by stress, at the moment, the axial rigidity of the damper is obviously reduced, further, the node rigidity is also obviously reduced, which corresponds to that the whole structure cycle of the structure is prolonged due to nonlinear development under the middle and large earthquakes, so that the earthquake response of the structure is reduced, and at the moment, the whole node enters a metal phase transformation and friction synergistic energy consumption stage. After earthquake or after unloading, under the action of the restoring force of the horizontal SMA rods, the structure can be restored to be close to the initial state at the whole and node level, and the repairing cost and difficulty of the structure caused by residual deformation are greatly reduced. In the stress process of the beam-column node, the main components of the beam-column have elastic working ranges, the nonlinear behaviors of the damper consume energy through friction of the friction plate and phase change of SMA, and the behaviors can be reused, so that the node and the damper do not need to be repaired within preset performance.
Claims (8)
1. A damper based on variable friction and multi-stage energy consumption, characterized by: the device comprises an outer sleeve (1), a piston inner cylinder (2), two friction assemblies, a plurality of vertical SMA screw rods (5) and a plurality of horizontal SMA rods (6);
the piston inner cylinder (2) is integrally a rectangular pipe; the upper surface and the lower surface of the piston inner cylinder (2) are respectively provided with an upper cushion block (3) and a lower cushion block (30); the friction components are arranged on the opposite sides of the upper cushion block (3) and the lower cushion block (30) respectively to form an upper friction component and a lower friction component; the friction assembly comprises a fixed friction block (402) and a vertical sliding friction block (401); the fixed friction block (402) is fixedly connected with the cushion block (3); the fixed friction block (402) and the vertical sliding friction block (401) are meshed at a contact surface; waist-shaped holes for the vertical SMA screw rods (5) to pass through are formed in the upper cushion block (3), the lower cushion block (30) and the fixed friction block (402); a round hole for the vertical SMA screw rod (5) to pass through is formed in the vertical slidable friction block (401); the vertical SMA screw (5) penetrates through the upper friction assembly, the upper cushion block (3), the piston inner cylinder (2), the lower cushion block (30) and the lower friction assembly in sequence; the upper end and the lower end of the vertical SMA screw (5) are fastened by nuts; the side wall of the piston inner cylinder (2) is also provided with a guide rail sliding block I (7) and a guide rail sliding block II (70); the sizes of the guide rail sliding block I (7) and the guide rail sliding block II (70) are matched with the size of the inner cavity of the outer sleeve (1);
the outer sleeve (1) is a rectangular pipe as a whole; the outer sleeve (1) is shorter than the inner piston cylinder (2); a vertical sliding friction block accommodating notch (103) is formed in the pipe wall of the outer sleeve (1); the piston inner cylinder (2) penetrates into the outer sleeve (1); the fixed friction block (402), the upper cushion block (3) and the lower cushion block (30) are arranged in the inner cavity of the outer sleeve (1); the vertical sliding friction block (401) is embedded into the accommodating notch (103); openings at two ends of the outer sleeve (1) are plugged by an end plate I (8) and an end plate II (9); the end plate I (8) is provided with a through hole matched with the shape of the piston inner cylinder (2); the end plate I (8) and the end plate II (9) are provided with anchoring holes; the extending end of the piston inner cylinder (2) abuts against the end plate II (9), and the extending end extends out of the outer sleeve (1) from the through hole of the end plate I (8); the extending end of the piston inner cylinder (2) is welded with a connecting plate (11) with a hinge; the horizontal SMA rods (6) are arranged in gaps between the piston inner cylinder (2) and the outer sleeve (1); two ends of each horizontal SMA rod (6) penetrate through the anchoring holes of the end plate I (8) and the end plate II (9) and are connected with the end plate I (8) or the end plate II (9) through an anchorage device; and notches for the horizontal SMA rods (6) to pass through are arranged on the guide rail sliding block I (7) and the guide rail sliding block II (70).
2. A variable friction and multi-stage energy consumption based damper according to claim 1, characterized in that: the contact surfaces of the fixed friction block (402) and the vertical sliding friction block (401) are divided into a middle wedge-shaped friction surface and two end plane friction surfaces; the fixed friction block (402) and the vertical sliding friction block (401) are provided with wedge-shaped bosses or grooves which are connected one by one at the middle wedge-shaped friction surface; the lug boss is meshed with the groove.
3. A variable friction and multi-stage energy consumption based damper according to claim 1, characterized in that: the guide rail sliding block I (7) and the guide rail sliding block II (70) are in a cross shape.
4. A variable friction and multi-stage energy consumption based damper according to claim 1, characterized in that: the SMA screw rod (5) and the horizontal SMA rod (6) are made of nickel-titanium memory alloy.
5. A variable friction and multi-stage energy consumption based damper according to claim 1, characterized in that: the outer sleeve (1) is formed by welding in a sectional mode; the outer sleeve (1) comprises a sealing plate section and sleeve sections arranged at two ends of the sealing plate section; the sleeve section is a rectangular pipe; the closing plate section comprises two channel steels (102) with opposite notches; the two channel steel (102) are wrapped with an accommodating notch (103); the outer wall of one end, far away from the hinged connecting plate (11), of the outer sleeve (1) is further provided with a connecting plate (10).
6. A variable friction and multi-stage energy consumption based damper according to claim 1, characterized in that: the friction coefficient of the contact surface of the fixed friction block (402) and the vertical sliding friction block (401) is more than 0.25.
7. A beam column node which characterized in that: comprises an I-shaped steel beam (12), a frame column (18), a T-shaped plate (21) and a damper;
a fixed end plate (14) is welded to the lower flange of the I-shaped steel beam (12); a shear-resistant connecting plate (19) and a hinged support plate (16) are welded on the flange of the frame column (18);
the I-shaped steel beam (12) is connected with the frame column (18) through a shear-resistant connecting plate (19), a T-shaped plate (21) and a damper;
the web plate of the I-shaped steel beam (12) is connected with the shear connection plate (19) through shear bolts;
the T-shaped plate (21) comprises a vertical plate and a horizontal plate arranged on one side of the vertical plate; the vertical plate of the T-shaped plate (21) is fixedly connected with the flange of the frame column (18) through a high-strength bolt; the horizontal plate of the T-shaped plate (21) is fixedly connected with the upper flange of the I-shaped steel beam (12) through a high-strength bolt;
the damper is the damper based on variable friction and multi-stage energy consumption according to any one of claims 1 to 5; the damper is arranged below the lower flange of the I-shaped steel beam (12); the hinged connecting plate (11) is hinged with the hinged support plate (16) through a pin; and one end of the outer sleeve (1) far away from the hinged connecting plate (11) is welded with the fixed end plate (14).
8. A beam-column joint as defined in claim 7, wherein: stiffening ribs are arranged on the I-shaped steel beam (12) and the frame column (18).
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| CN202022077558.3U CN213926837U (en) | 2020-09-21 | 2020-09-21 | Variable friction force and multi-stage energy consumption based damper and beam column node |
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| CN202022077558.3U CN213926837U (en) | 2020-09-21 | 2020-09-21 | Variable friction force and multi-stage energy consumption based damper and beam column node |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144683A (en) * | 2020-09-21 | 2020-12-29 | 重庆大学 | Damper based on variable friction force and multi-stage energy consumption and assembling method thereof |
| CN113833340A (en) * | 2021-10-13 | 2021-12-24 | 重庆大学 | Multiple energy consumption damper with energy consumption time sequence and optimization design method thereof |
| CN114508039A (en) * | 2022-02-23 | 2022-05-17 | 浙江大学 | Friction type damping device with energy consumption and limiting functions |
| CN115288474A (en) * | 2022-08-23 | 2022-11-04 | 江苏科技大学 | Detachable beam column connection reinforcing and energy consumption device |
-
2020
- 2020-09-21 CN CN202022077558.3U patent/CN213926837U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144683A (en) * | 2020-09-21 | 2020-12-29 | 重庆大学 | Damper based on variable friction force and multi-stage energy consumption and assembling method thereof |
| CN113833340A (en) * | 2021-10-13 | 2021-12-24 | 重庆大学 | Multiple energy consumption damper with energy consumption time sequence and optimization design method thereof |
| CN113833340B (en) * | 2021-10-13 | 2022-11-29 | 重庆大学 | Multiple energy consumption damper with energy consumption time sequence and optimization design method thereof |
| CN114508039A (en) * | 2022-02-23 | 2022-05-17 | 浙江大学 | Friction type damping device with energy consumption and limiting functions |
| CN115288474A (en) * | 2022-08-23 | 2022-11-04 | 江苏科技大学 | Detachable beam column connection reinforcing and energy consumption device |
| CN115288474B (en) * | 2022-08-23 | 2023-11-21 | 江苏科技大学 | Detachable beam column connection reinforcing and energy consumption device |
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