GB2583164A - Negative stiffness vibration reduction and isolation device for continuous beam - Google Patents

Negative stiffness vibration reduction and isolation device for continuous beam Download PDF

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Publication number
GB2583164A
GB2583164A GB2001011.2A GB202001011A GB2583164A GB 2583164 A GB2583164 A GB 2583164A GB 202001011 A GB202001011 A GB 202001011A GB 2583164 A GB2583164 A GB 2583164A
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United Kingdom
Prior art keywords
earthquake
frame
negative stiffness
spring
buffer
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GB2001011.2A
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GB202001011D0 (en
GB2583164B (en
Inventor
Chen Shitong
Zhang Maojiang
Li Yiqiang
Li Feng
Zhang Yaohui
Wang Jinjiang
Ma Yao
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Shijiazhuang Tiedao University
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Shijiazhuang Tiedao University
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Publication of GB202001011D0 publication Critical patent/GB202001011D0/en
Publication of GB2583164A publication Critical patent/GB2583164A/en
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/04Bearings; Hinges

Abstract

The apparatus comprises a trigger device 1, a sliding device 2, a buffer device 3, a fixing device 4, a positive stiffness spring group 5 and a negative stiffness spring group 6. The top of the trigger device is fixedly connected with a lower wing plate of a main beam of a continuous beam, and the buffer device is fixedly installed at a middle portion of the fixing device. An inner side of the sliding device is connected to the buffer device via the negative stiffness spring group, two sides of the sliding device are connected with the fixing device via the positive stiffness spring group and the fixing device is fixed at the top of a movable pier. The sliding device is configured to move along tension and compression directions of the positive stiffness spring group. The apparatus acts to reduce the vibration of the movable bridge or pier during an earthquake.

Description

NEGATIVE STIFFNESS VIBRATION REDUCTION AND ISOLATION DEVICE
FOR CONTINUOUS BEAM
TECHNICAL FIELD
[0001] The present invention relates to negative stiffness vibration reduction and isolation device for continuous beams, and belongs to the technical field of bridge vibration reduction and isolation.
BACKGROUND OF THE PRESENT INVENTION
[0002] In order to meet displacement requirements caused by temperature, loads, creep and other actions, each link of a continuous beam bridge is often provided with only one fixed pier, so that most of the longitudinal seismic load of a superstructure under an earthquake are borne by the fixed pier. It is often difficult for fixed piers to meet earthquake endurance requirements, and furthermore, longitudinal earthquake displacement responses of continuous beam bridges are relatively large, which tend to cause damages to expansion joint gaps and support structures. An effective method for reducing earthquake responses of continuous beams is by changing the load bearing state of a fixed pier alone, making full use of earthquake endurance capacities of movable piers, and utilizing synergetic effects of movable piers and fixed piers to improve earthquake endurance. However, existing connecting device that locks movable piers with a beam body has some drawbacks. For example, although existing devices such as Lock-up devices and locking pin devices can achieve a locking function of movable piers and the beam body, activation of locking devices changes the structural system of the continuous beam bridge, and a force transmission path is generated between a main beam and the movable piers, so that the integral stiffness of the continuous beam bridge is increased, resulting in a decrease in the earthquake response period of the entire bridge, which leads to an increase in the earthquake response of the entire bridge.
SUMMARY OF THE PRESENT INVENTION
[0003] The technical problem to be solved by the present invention is to provide a negative stiffness vibration reduction and isolation device for a continuous beam, which is capable of not only temporarily locking movable piers and a main beam structure through locking pins so as to cooperate with a fixed pier to bear earthquake load together, but also reducing the connection stiffness between the movable piers and the main beam to improve structural load bearing capacity in the event of an earthquake.
[0004] The present invention adopts the following technical solutions: [0005] The present invention includes a trigger device, a sliding device, a buffer device, a fixing device, a positive stiffness spring group and a negative stiffness spring group; the top of the trigger device is fixedly connected with a lower wing plate of a main beam of a continuous beam, and the buffer device is fixedly installed at the middle part of the fixing device; and an inner side of the sliding device is connected with the buffer device via the negative stiffness spring group, two sides of the sliding device are connected with the fixing device via the positive stiffness spring group, the sliding device moves along tension and compression directions of the positive stiffness spring group, and the fixing device is fixed at the top of a movable pier.
[0006] The trigger device of the present invention includes a slot plate and a plurality of cylindrical sleeves installed at the bottom of the slot plate, the top of the slot plate is fixedly connected with the lower wing plate of the main beam of a continuous beam bridge, and locking device is arranged in the cylindrical sleeves; an open slot is formed in a side wall of the cylindrical sleeve; the locking device includes a columnar connecting piece installed in the open slot, and a locking pin installed between two corresponding columnar connecting pieces and arranged in a cylindrical sleeve; the locking pin is a cylinder; and a gap is arranged between an inner side wall of the cylindrical sleeve and an outer wall of the locking pin.
[0007] The fixing device of the present invention includes a base, a corbel and a limiting device; the corbel is fixedly installed on a top face of an end part of the base, the limiting device includes a limiting groove fixed on an outer side of the base and a slidable groove-shaped slide block arranged in the limiting groove, the limiting groove restricts the lateral displacement of the sliding device, and the groove-shaped slide block causes the sliding device to move along the tension and compression directions of the positive stiffness spring group; and the base is installed at the top of the movable pier.
[0008] The buffer device of the present invention includes a buffer groove body and half cylinders; and the buffer groove body is installed at the middle of the top face of the base; and the half cylinders are arranged in two columns in the groove of the buffer groove body, and rectangular side faces of the half cylinders are fixedly connected with the inner side wall of the buffer groove body.
[0009] The sliding device of the present invention includes an inverted U-shaped frame and a buffer frame; the inverted U-shaped frame includes a frame body and a locking slotted hole formed in a top plate of the frame body, the frame body crosses the buffer groove body and the bottom thereof is fixedly installed in the groove of the groove-shaped slide block; two side edges of a vertical plate of the frame body are respectively connected with the corbel through positive stiffness springs of the positive stiffness spring group, the inner side wall of the vertical plate of the frame body are respectively connected with the outer side of the buffer groove body through negative stiffness springs of the negative stiffness spring group, the two ends of the positive stiffhess springs are hinged with the vertical plate of the frame body and the corbel, the two ends of the negative stiffness springs are hinged with the vertical plate of the frame body and the outer side of the buffer groove body, the limiting groove limits the lateral displacement of the frame body, and the groove-shaped slide block enables the frame body to move along the tension and compression direction of the positive stiffness spring group; the number of locking slotted holes matches the number of locking pins, and an inner diameter of the locking slotted hole is slightly greater than the diameter of the locking pin; the distance between the corresponding locking slotted hole and the axis of the locking pin is L; and the buffer frame includes a plurality of metal cylinders and connecting. plates installed between two adjacent metal cylinders, and the metal cylinders are fixedly installed at the bottom of the top plate of the inverted U-shaped frame, and the buffer frame is inserted between the two columns of half cylinders.
[0010] The radius of the half cylinder of the present invention is the same as the radius of the metal cylinder, and the half cylinder is tangent to the corresponding metal cylinder; and the metal cylinder is made of Q235 alloy steel, the half cylinder is made of soft steel, and the metal cylinders reciprocate between the two columns of half cylinders under the action of a longitudinal earthquake to squeezing the half cylinders to deform so as to dissipate the earthquake energy.
[0011] The columnar connecting piece of the present invention includes a connecting column fixed with the outer side of the locking pin and a handle fixedly installed at an outer end part of the connecting column, the diameter of the connecting column is smaller than the width of the open slot, and the diameter of the handle is greater than the width of the open slot.
[0012] The positive stiffness springs of the positive stiffness spring group of the present invention are in an original length state, the sliding device and the fixing device generate relative displacement under the action of the longitudinal earthquake, the positive stiffness springs on the two sides of the vertical plate of the frame body respectively generate tension and compression deformation to transfer the upper earthquake load to the movable pier, and the positive stiffness spring group can dissipate the earthquake energy while deforming to transfer the force; the negative stiffness spring group is in a compressed state during normal operation, stores a part of elastic potential energy, is in an inactive state and does not provide negative stiffness; when the sliding device and the fixing device generate relative displacement under the action of the longitudinal earthquake, the action direction of the earthquake load is opposite to the compression deformation direction of the negative stiffness spring group, so that the compression deformation becomes smaller to release the stored elastic potential energy, the negative stiffness spring group provides a spring force that is consistent with the relative displacement direction to achieve a negative stiffness connection of the vibration reduction and isolation device, through the reasonable settings of the parameters of the positive stiffness spring group and the negative stiffness spring group, under the premise of avoiding an increase in the overall earthquake response of the continuous beam bridge caused by the increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body, the movable pier and the fixed pier bear the horizontal load of the earthquake together to maximize the earthquake performance of the continuous beam bridge; and under the reciprocating action of the earthquake, reciprocating motion occurs between the sliding device and the fixing device, and the positive stiffness and the negative stiffness of the negative stiffness spring group and the positive stiffness spring group can be interchanged according to the relative positions thereof during the reciprocating motion.
[0013] The working principle of the present invention is as follows: [0014] In a normal operation state, the top of the slot plate is fixedly connected with the lower wing plate of the main beam of the continuous beam bridge, and the base is fixed to the top of the movable pier of the continuous beam bridge; and a certain distance L is reserved between the locking pin and the locking slotted hole to meet the longitudinal displacement requirements of the bridge in the normal operation state, and the trigger device and the top plate of the sliding device can freely slide so as not to limit the relative displacement between the main beam structure and the movable pier. The negative stiffness spring group is in the compressed state, the positive stiffness spring group is the original length state, the metal cylinder is tangent to the half cylinder, and the negative stiffness spring group is not activated and does not provide negative stiffness.
[0015] When the earthquake suddenly occurs and the relative displacement of the pier exceeds L, the locking pin in the trigger device falls into the locking slotted hole to realize the temporary locking of the main beam and the movable pier, which in turn drives the relative displacement of the sliding device and the fixing device, so as to transfer the upper earthquake load to the movable pier to realize the coordinated bearing of the fixed pier and the movable pier, at the same time, the positive stiffness spring group deforms to transmit the force and dissipates the earthquake energy, the direction of the earthquake load is opposite to the compression deformation direction of the pre-pressed negative stiffness spring group, so that the compression deformation becomes smaller to release the stored elastic potential energy, the negative stiffness spring group provides the spring force that is consistent with the relative displacement direction to achieve the negative stiffness connection of the vibration reduction and isolation device, and through the reasonable settings of the parameters of the positive stiffness spring group and the negative stiffness spring group, under the premise of avoiding the increase in the overall earthquake response of the continuous beam bridge caused by the increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body, the movable pier and the fixed pier bear the horizontal load of the earthquake together to maximize the earthquake performance of the continuous beam bridge. Under the reciprocating action of the earthquake, reciprocating motion occurs between the sliding device and the fixing device, and the positive stiffness and the negative stiffness of the negative stiffness spring group and the positive stiffness spring group can be interchanged according to the relative positions thereof during the reciprocating motion, which in turn avoids the problem of increased earthquake response caused by the increased stiffness of the overall bridge because the movable pier and the fixed pier bear the earthquake load together in the entire earthquake generation process, and a plate-shaped member moves between the two rows of half cylinders in the buffer device to extrude the half cylinders to cause the same to deform to consume energy.
[0016] The positive effects of the present invention are as follows: [0017] In the present invention, the diameter of the locking pin is slightly smaller than the inner diameter of the cylindrical sleeve, the diameter of the locking slotted hole is slightly greater than the diameter of the locking pin, the cylindrical sleeve is not in contact with the inverted U-shaped frame, and a bottom surface of the locking pin is in smooth contact with the top face of the inverted U-shaped frame to ensure that it can slide smoothly; the radius of the half cylinder is equal to the radius of the metal cylinder, and the half cylinder is tangent to the corresponding metal cylinder to achieve the purpose of realizing extrusion deformation and dissipating energy during the earthquake; the distance between the locking pin and the locking slotted hole is L to meet the longitudinal displacement requirements of the bridge in the normal operation state, when the earthquake occurs suddenly and the relative displacement of the pier exceeds L, the locking pin falls into the locking slotted hole, which in turn drives the sliding device and the fixing device to generate relative displacement, so as to transfer the upper earthquake load to the movable pier to realize the coordinated bearing of the fixed pier and the movable pier, the positive stiffness spring group dissipates the earthquake energy while deforming to transfer the force, the action direction of the earthquake load is opposite to the compression deformation direction of the negative stiffness spring group, so that the compression deformation becomes smaller to release the stored elastic potential energy, the negative stiffness spring group provides the spring force that is consistent with the relative displacement direction to achieve the negative stiffness connection of the vibration reduction and isolation device, through the reasonable settings of the parameters of the positive stiffness spring group and the negative stiffness spring group, under the premise of avoiding the increase in the overall earthquake response of the continuous beam bridge caused by the increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body, the movable pier and the fixed pier bear the horizontal load of the earthquake together to maximize the earthquake performance of the continuous beam bridge, under the reciprocating action of the earthquake, the reciprocating motion occurs between the sliding device and the fixing device, the positive stiffness and the negative stiffness of the negative stiffness spring group and the positive stiffness spring group can be interchanged according to the relative positions thereof during the reciprocating motion, which in turn avoids the problem of increased earthquake response caused by the increased stiffness of the overall bridge because the movable pier and the fixed pier bear the earthquake load together in the entire earthquake generation process, and meanwhile, the buffer frame and the half cylinder extrudes each other to deform the half cylinder consume the energy. The present invention can avoid the increase in the overall stiffness of the continuous beam bridge caused by the connection between the movable pier and the beam body while temporarily locking the movable pier to make the same cooperate with the fixed pier, and improves the earthquake resistance of the overall structure.
[0018] The present invention is simple in principle, is economical and reliable, not only realizes the joint bearing of the horizontal load of the earthquake by the movable pier and the fixed pier, but also solves the problem of great increase in the overall earthquake response of the continuous beam bridge caused by the increase of the overall lateral displacement resistance of the continuous beam bridge due to the intervention of the existing pier locking device, can be used for the earthquake resistant design of newly built continuous beams and the earthquake resistance reinforcement of the existing continuous beam bridges, and is convenient for popularization and application.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Fig. 1 is a structural schematic diagram of the present invention; [0020] Fig. 2 is a structural schematic diagram of a trigger device of the present invention; [0021] Fig. 3 is a structural schematic diagram of an inverted U-shaped frame of the present invention; [0022] Fig. 4 is a structural schematic diagram of a buffer frame of the present invention; [0023] Fig. 5 is a structural schematic diagram of a relative position of a buffer frame and a half cylinder of the present invention; [0024] Fig. 6 is a structural schematic diagram of a fixing device of the present invention; [0025] Fig. 7 is a schematic diagram of a sectional structure of the present invention when working under the action of a longitudinal earthquake.
[0026] in which: 1: trigger device; 101: slot plate; 102: cylindrical sleeve; 103: locking pin; 104: cylindrical connecting piece; 105: open slot; 2: sliding device; 201: inverted U-shaped frame; 211: frame body; 212: locking slotted hole; 202: buffer frame; 221: metal cylinder; 222: connecting plate; 8 3: buffer device; 301: buffer groove body; 302: half cylinder; 4: fixing device; 401: base; 402: corbel; 403: limiting device; 431: limiting groove; 432: groove-shaped slide block; 5: positive stiffness spring group; 6: negative stiffness spring group.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
[0027] As shown in Fig. 1, the present invention includes a trigger device 1, a sliding device 2, a buffer device 3, a fixing device 4, a positive stiffness spring group 5 and a negative stiffness spring group 6; the top of the trigger device 1 is fixedly connected with a lower wing plate of a main beam of a continuous beam, and the buffer device 3 is fixedly installed at the middle of the fixing device 4; an inner side of the sliding device 2 is connected with the buffer device 3 through the negative stiffness spring group 6, two side edges of the sliding device 2 are connected with the fixing device 4 through the positive stiffness spring group 5, the sliding device 2 moves along a tension and compression direction of the positive stiffness spring group 5, and the fixing device 4 is fixed at the top of a movable pier.
[0028] As shown in Fig. 2, the trigger device 1 of the present invention includes a slot plate 101 and a plurality of cylindrical sleeves 102 installed at the bottom of the slot plate 101, the top of the slot plate 101 is fixedly connected with the lower wing plate of the main beam of a continuous beam bridge, and a locking device is arranged in the cylindrical sleeve 102; an open slot 105 is formed in a side wall of the cylindrical sleeve 102; and the open slot 105 has a combined shape in which an upper end is semicircular, a lower end is semicircular, and the middle portion is rectangular. The locking device includes a columnar connecting piece 104 installed in the open slot 105, and a locking pin 103 is installed between two corresponding columnar connecting pieces 104 and arranged in the cylindrical sleeve 102, and the locking pin 103 is of a cylindrical shape; a gap is arranged between an inner side wall of the cylindrical sleeve 102 and an outer wall of the locking pin 103; the diameter of the locking pin 103 is slightly smaller than an inside diameter of the cylindrical sleeve 102. The columnar connecting piece 104 includes a connecting column fixed with the outer side of the locking pin 103 and a handle fixedly installed at an outer end part of the connecting column, the diameter of the connecting column is smaller than the width of the open slot 105, and the diameter of the handle is greater than the width of the open slot 105. The locking pin 103 can freely slide in the open slot 105, the sliding displacement is limited by the connecting column when the locking pin 103 slides downward, so that it does not deviate from the cylindrical sleeve 102, and the locking pin is reset by lifting the handle after the earthquake stops.
[0029] As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the fixing device 4 of the present invention includes a base 401, a corbel 402 and a limiting device 403; the corbel 402 is fixedly installed on a top face of an end part of the base 401, the limiting device 403 includes a limiting groove 431 fixed on an outer side of the base 401 and a slidable groove-shaped slide block 432 arranged in the limiting groove 431, the limiting groove 431 restricts the lateral displacement of the sliding device 2, and the groove-shaped slide block 432 causes the sliding device 2 to move along the tension and compression direction of the positive stiffness spring group 5; the base 401 is installed at the top of the movable pier.
[0030] The buffer device 3 of the present invention includes a buffer groove body 301 and half cylinders 302; the buffer groove body 301 is installed at the middle part of the top face of the base 401, and the half cylinders 302 are arranged in two columns in the groove of the buffer groove body 3W, with rectangular side faces of the half cylinders 302 fixedly connected with the inner side wall of the buffer groove body 301.
[0031] The sliding device 2 of the present invention includes an inverted U-shaped frame 201 and a buffer frame 202; the inverted U-shaped frame 201 includes a frame body 211 and a locking slotted hole 212 formed in a top plate of the frame body 211, the frame body 211 crosses the buffer groove body 301, and the bottom thereof is fixedly installed in the groove of the groove-shaped slide block 432; the two side edges of a vertical plate of the frame body 211 are respectively connected with the corbel 402 through positive stiffness springs of the positive stiffness spring group 5, the inner side wall of the vertical plate of the frame body 211 are respectively connected with the outer side of the buffer groove body 301 through negative stiffness springs of the negative stiffness spring group 6, the two ends of the positive stiffness springs are hinged with the vertical plate of the frame body 211 and the corbel 402, the two lo ends of the negative stiffness springs are hinged with the vertical plate of the frame body 211 and the outer side of the buffer groove body 301, the limiting groove 431 limits the lateral displacement of the frame body 211, and the groove-shaped slide block 432 enables the frame body 211 to move along the tension and compression direction of the positive stiffness spring group; the number of locking slotted holes 212 matches the number of locking pins 103, and the inner diameter of the locking slotted hole 212 is slightly greater than the diameter of the locking pin 103; the distance between the corresponding locking slotted hole 212 and the axis of the locking pin 103 is L to meet the longitudinal displacement demands of the bridge in a normal operation state; and when earthquake suddenly occurs and relative displacement of the pier exceeds L, the locking pin 103 in the trigger device 1 falls into the locking slotted hole 212, which in turn drives the relative displacement of the sliding device 2 and the fixing device 4, so as to transfer the upper earthquake load to the movable pier to realize the coordinated bearing of the fixed pier and the movable pier.
[0032] The buffer frame 202 of the present invention includes a plurality of metal cylinders 221 and connecting plates 222 installed between two adjacent metal cylinders 221, the metal cylinders 221 are fixedly installed at the bottom of the top plate of the inverted U-shaped frame 201, the buffer frame 202 is inserted between the two columns of half cylinders 302, the half cylinder 302 is tangent to the corresponding metal cylinder 221 to achieve the best deformation energy consumption effect; and the radius of the half cylinder 302 is the same as the radius of the metal cylinder 221, the metal cylinder 221 is made of Q235 alloy steel, the half cylinder 302 is made of soft steel, and the metal cylinders 221 reciprocate between the two columns of half cylinders 302 under the action of a longitudinal earthquake to squeezing the half cylinders 302 to deform so as to dissipate the earthquake energy.
[0033] As shown in Fig. 7, the positive stiffness springs of the positive stiffness spring group 5 of the present invention are in an original length state, the sliding device 2 and the fixing device 4 generate relative displacement under the action of the longitudinal earthquake, the positive stiffness springs on the two side edges of the vertical plate of the frame body 211 respectively generate tension and compression deformation to transfer the upper earthquake load to the movable pier, and the positive stiffness spring group 5 can dissipate the earthquake energy while deforming to transfer the force; the negative stiffness spring group 6 is in a compressed state during normal operation, stores a part of elastic potential energy, is in an inactive state and does not provide negative stiffness; when the sliding device 2 and the fixing device 4 generate relative displacement under the action of the longitudinal earthquake, the action direction of the earthquake load is opposite to the compression deformation direction of the negative stiffness spring group 6, so that the compression deformation becomes smaller to release the stored elastic potential energy, the negative stiffness spring group 6 provides a spring force that is consistent with the relative displacement direction to achieve a negative stiffness connection of the vibration reduction and isolation device, through the reasonable settings of the parameters of the positive stiffness spring group 5 and the negative stiffness spring group 6, under the premise of avoiding an increase in the overall earthquake response of the continuous beam bridge caused by the increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body, the movable pier and the fixed pier bear the horizontal load of the earthquake together to maximize the earthquake performance of the continuous beam bridge; and under the reciprocating action of the earthquake, reciprocating motion occurs between the sliding device 2 and the fixing device 4, and the positive stiffness and the negative stiffness of the negative stiffness spring group 6 and the positive stiffness spring group 5 can be interchanged according to the relative positions thereof during the reciprocating motion.
[0034] In the normal operation state, the top of the slot plate 101 of the present invention is fixedly connected with the lower wing plate of the main beam of the continuous beam bridge, the base 3 is fixedly installed at the top of the movable pier of the continuous beam bridge, a certain distance L is reserved between the locking pin 103 and the locking slotted hole 212 to meet the longitudinal displacement requirements of the bridge in the normal operation state, and the trigger device 1 and the top plate of the sliding device 2 can freely slide so as not to limit the relative displacement between the main beam structure and the movable pier. The negative stiffness spring group 6 is in the compressed state, the positive stiffness spring group 5 is the original length state, the half cylinder 302 is tangent to the metal cylinder 221, and the negative stiffness spring group 6 is not activated and does not provide negative stiffness.
[0035] When earthquake suddenly occurs and the relative displacement of the pier exceeds L, the locking pin 103 falls into the locking slotted hole 212 to realize the temporary locking of the main beam and the movable pier, which in turn drives the relative displacement of the sliding device 2 and the fixing device 4, so as to transfer the upper earthquake load to the movable pier to realize the coordinated bearing of the fixed pier and the movable pier, at the same time, the positive stiffness spring group 5 deforms to transmit the force and dissipates the earthquake energy, the direction of the earthquake load is opposite to the compression deformation direction of the negative stiffness spring group 6, so that the compression deformation of the negative stiffness spring group 6 becomes smaller to release the stored elastic potential energy, the negative stiffness spring group 6 provides the spring force that is consistent with the relative displacement direction to achieve the negative stiffness connection of the vibration reduction and isolation device, and through the reasonable settings of the parameters of the positive stiffness spring group 5 and the negative stiffness spring group 6, under the premise of avoiding the increase in the overall earthquake response of the continuous beam bridge caused by the increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body, the movable pier and the fixed pier bear the horizontal load of the earthquake together to maximize the earthquake performance of the continuous beam bridge. Under the reciprocating action of the earthquake, reciprocating motion occurs between the sliding device 2 and the fixing device 4, and the positive stiffness and the negative stiffness of the negative stiffness spring group 6 and the positive stiffness spring group 5 can be interchanged according to the relative positions thereof during the reciprocating motion, which in turn avoids the problem of increased earthquake response caused by the increased stiffness of the overall bridge because the movable pier and the fixed pier bear the earthquake load together in the entire earthquake generation process, and the buffer frame 202 moves between the two rows of half cylinders 302 to extrude the half cylinders 302 to cause the same to deform to consume energy.
[0036] The present invention can avoid the increase in the overall stiffness of the continuous beam bridge caused by the connection between the movable pier and the beam body while temporarily locking the movable pier to make the same cooperate with the fixed pier, and improves the earthquake resistance of the overall structure. The present invention is simple in principle, is economical and reliable, not only realizes the joint bearing of the horizontal load of the earthquake by the movable pier and the fixed pier, but also solves the problem of great increase in the overall earthquake response of the continuous beam bridge caused by the increase of the overall lateral displacement resistance of the continuous beam bridge due to the intervention of the existing pier locking device, can be used for the earthquake resistant design of newly built continuous beams and the earthquake resistance reinforcement of the existing continuous beam bridges, and is convenient for popularization and application.

Claims (8)

  1. What is claimed is: 1. A negative stiffness vibration reduction and isolation apparatus for a continuous beam, comprising: a trigger device (1), a sliding device (2), a buffer device (3), a fixing device (4), a positive stiffness spring group (5) and a negative stiffness spring group (6), wherein: the top of the trigger device (1) is fixedly connected with a lower wing plate of a main beam of a continuous beam, and the buffer device (3) is fixedly installed at a middle portion of the fixing device (4); an inner side of the sliding device (2) is connected with the buffer device (3) via the negative stiffness spring group (6), two sides of the sliding device (2) are connected with the fixing device (4) via the positive stiffness spring group (5), and the fixing device (4) is fixed at the top of a movable pier; and the sliding device (2) is configured to move along tension and compression directions of the positive stiffness spring group (5).
  2. 2. The negative stiffness vibration reduction and isolation device of claim 1, wherein: the trigger device (1) comprises a slot plate (101) and at least one cylindrical sleeve (102) installed at the bottom of the slot plate (101), the top of the slot plate (101) is fixedly connected with the lower wing plate of the main beam of the continuous beam, and a locking device is arranged in the cylindrical sleeve (102); an open slot (105) is formed in a side wall of the cylindrical sleeve (102), the locking device comprises a columnar connecting piece (104) installed in the open slot (105), and a locking pin (103) installed between two corresponding columnar connecting pieces (104) and arranged in the cylindrical sleeve (102), and the locking pin (103) is of a cylindrical shape; and a gap is arranged between an inner side wall of the cylindrical sleeve (102) and an outer wall of the locking pin (103).
  3. 3. The negative stiffness vibration reduction and isolation device of claim 2, wherein: the fixing device (4) comprises a base (401), a corbel (402) and a limiting device (403); the corbel (402) is fixedly installed on a top side of an end portion of the base (401), and the limiting device (403) comprises a limiting groove (431) fixed on an outer side of the base (401) and a slidable groove-shaped slide block (432) arranged in the limiting groove (431), the limiting groove (431) operable to restrict lateral displacement of the sliding device (2), and the groove-shaped slide block (432) operable to cause the sliding device (2) to move along the tension and compression directions of the positive stiffness spring group (5); and the base (401) is installed at the top of the movable pier.
  4. 4. The negative stiffness vibration reduction and isolation device of claim 3, wherein: the buffer device (3) comprises a buffer groove body (301) and half cylinders (302); and the buffer groove body (301) is installed at a middle portion of the top surface of the base (401), and the half cylinders (302) are arranged as two columns in the groove of the buffer groove body (301), with rectangular side surfaces of the half cylinders (302) fixedly connected with inner side walls of the buffer groove body (301).
  5. 5. The negative stiffness vibration reduction and isolation device of claim 4, wherein: the sliding device (2) comprises an inverted U-shaped frame (201) and a buffer frame (202); the inverted U-shaped frame (201) comprises a frame body (211) and locking holes (212) formed in a top plate of the frame body (211); the frame body (211) strides cross the buffer groove body (301), and the bottom of the frame body (211) is fixedly installed in the groove of the groove-shaped slide block (432); two side edges of a vertical plate of the frame body (211) are respectively connected with the corbel (402) via positive stiffness springs of the positive stiffness spring group (5), inner side walls of the vertical plate of the frame body (211) are respectively connected with the outer sides of the buffer groove body (301) via negative stiffness springs of the negative stiffness spring group (6), two ends of each positive stiffness spring are hinged with the vertical plate of the frame body (211) and the corbel (402), and two ends of each negative stiffness spring are hinged with the vertical plate of the frame body (211) and the outer sides of the buffer groove body (301); the limiting groove (431) is configured to limit lateral displacement of the frame body (211), and the groove-shaped slide block (432) is configured to allow the frame body (211) to move along the tension and compression directions of the positive stiffness spring group; the number of locking holes (212) matches the number of locking pins (103), and an inner diameter of each locking slotted hole (212) is slightly greater than a diameter of each locking pin (103); a longitudinal axis of each locking pin (103) is spaced from a longitudinal axis of a corresponding locking hole (212) by a distance L; and the buffer frame (202) comprises a plurality of metal cylinders (221) and connecting plates (222) installed between two adjacent metal cylinders (221), and the metal cylinders (221) are fixedly installed at the bottom of the top plate of the inverted U-shaped frame (201), and the buffer frame (202) is inserted between the two columns of half cylinders (302).
  6. 6. The negative stiffness vibration reduction and isolation device of claim 5, wherein: the radius of each half cylinder (302) is the same as the radius of each metal cylinder (221), and each half cylinder (302) is tangent to a corresponding metal cylinder (221); the metal cylinders (221) are made of Q235 alloy steel, the half cylinders (302) are made of soft steel; and the metal cylinders (221) are configured to reciprocate between the two columns of half cylinders (302) under longitudinal forces of an earthquake to squeeze and deform the half cylinders (302) so as to dissipate earthquake energy.
  7. 7. The negative stiffness vibration reduction and isolation device of claim 2, wherein the columnar connecting piece (104) comprises a connecting column fixed with the outer wall of the locking pin (103) and a handle fixedly installed at an outer end portion of the connecting column, the diameter of the connecting column is smaller than the width of the open slot (105), and the diameter of the handle is greater than the width of the open slot (105).
  8. 8. The negative stiffness vibration reduction and isolation device of claim 6, wherein: the positive stiffness springs of the positive stiffness spring group (5) are of an original length when in a rest state, the sliding device (2) and the fixing device (4) are configured to displace with respect to each other in response to a longitudinal force of an earthquake, and the positive stiffness springs on the two sides of the vertical plate of the frame body (211) respectively are pulled or compressed to transfer an upper earthquake load to the movable pier, thereby dissipating earthquake energy while deformed to transfer earthquake forces; the negative stiffness spring group (6) is in a compressed state during normal operation, storing elastic potential energy while remaining in an inactive state and not providing negative stiffness; when the sliding device (2) and the fixing device (4) are relatively displaced under a longitudinal force of an earthquake, the action direction of the earthquake load is opposite to the compression deformation direction of the negative stiffness spring group (6), such that the compression deformation decreases to release the stored elastic potential energy; the negative stiffness spring group (6) provides a spring force that is consistent with the relative displacement direction to achieve a negative stiffness connection of the vibration reduction and isolation device; parameters of the positive stiffness spring group (5) and the negative stiffness spring group (6) are configured to allow a horizontal earthquake load to be borne by the movable pier and the fixed pier together to maximize earthquake tolerance of the continuous beam bridge while avoiding increased overall earthquake response of the continuous beam bridge caused by increased overall stiffness of the continuous beam bridge due to the connection of the movable pier and the beam body; and the sliding device (2) and the fixing device (4) are configured to perform reciprocating motion under reciprocating actions of an earthquake, and the negative stiffness spring group (6) and the positive stiffness spring group (5) are configured to switch between positive stiffness and negative stiffness according to relative positions of the spring groups during the reciprocating motion.
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CN111981087A (en) * 2020-08-27 2020-11-24 中铁二院工程集团有限责任公司 Metal energy consumption limiting and beam falling preventing device for bridge

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