A connection hinge applicable to prefabricated and assembled bridge piers

Abstract

The present invention relates to a connecting hinge applicable to precast segmental piers, which comprises an upper plate, a lower plate, prestressed tendons and buckling-restrained braces. The upper plate is arranged at the bottom of the pier column, and the lower plate is fixed on the pile cap. A spherical contact fit is formed between the middle regions of the upper plate and the lower plate to form a spherical hinge structure. The buckling-restrained braces are arranged between the upper plate and the lower plate and around the spherical hinge structure. Compared with the prior art, the rotation of the spherical hinge in the present invention can avoid local damage to the bottom of the pier column caused by the impact force during the swaying of the traditional rocking pier. The provided connecting hinge can be assembled with the precast pier in the factory, and the prestressed tendons are tensioned. On site, only the bottom plate of this connecting hinge needs to be bolted to the pile cap, eliminating the processes such as on-site tensioning of prestressed tendons in the construction of traditional precast piers, and having great convenience and time efficiency. After an earthquake, only the buckling-restrained braces need to be replaced, which is convenient for rapid restoration.

Description

Technical Field

[0001] The present invention belongs to the technical fields of bridge engineering and earthquake engineering, and relates to a connection hinge applicable to precast segmental piers. Background Art

[0002] Traditional ductile seismic design methods allow plastic hinges to form at the bottom of piers and dissipate energy through the plastic hinges. Although this method prevents the collapse of bridges, large residual deformations will occur after earthquakes, making it impossible to resume normal traffic after the earthquake. Therefore, it has brought multi-faceted impacts on social economy, including: hindrance to post-earthquake disaster relief, forced demolition of piers, limited commercial economy, etc., resulting in huge economic losses. In order to restore the service function of bridges after earthquakes, more and more scholars have begun to study bridges with recoverable functions.

[0003] Rocking piers have excellent seismic performance and post-earthquake recovery ability, and are very suitable for the application of precast assembly technology. However, during the rocking process, the local pressure at the rocking interface may cause spalling and crushing of the pier concrete at the rotation point. At present, how to avoid local damage to rocking piers is a major research difficulty.

[0004] Most rocking piers are precast and adjacent components are connected by unbonded post-tensioned tendons. Although precast segmental construction speeds up the bridge construction, there are still a series of on-site operations, such as the tensioning of tendons. Not only is the tendon tensioning difficult and time-consuming, but it is also difficult to inspect the anchorage quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a connection hinge applicable to precast segmental piers, which is suitable for the rapid connection between piers and abutments and reduces local damage caused by rocking and collision at the bottom of pier columns, etc.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A connection hinge applicable to precast segmental piers includes an upper plate, a lower plate, prestressed tendons and buckling-restrained braces. The upper plate is arranged at the bottom of the pier column, the lower plate is fixed on the abutment, and the middle regions of the upper plate and the lower plate are in spherical contact and form a spherical hinge structure; the prestressed tendons can be unbonded prestressed tendons, one end of which is anchored at the top of the pier column and the other end is anchored on the bottom plate of the lower plate; the buckling-restrained braces are arranged between the upper plate and the lower plate and around the spherical hinge structure.

[0008] Furthermore, the upper plate includes a top plate anchored at the bottom of the pier column and a spherical hinge head arranged on the lower surface of the top plate. The lower plate includes a bottom plate fixed on the abutment and a spherical hinge socket arranged on the upper surface of the bottom plate. The spherical hinge head and the spherical hinge socket are in spherical contact to form the spherical hinge structure.

[0009] Furthermore, the corner position of the spherical hinge socket transitioning from the spherical inner wall to the platform section is provided with a chamfer.

[0010] Furthermore, the spherical hinge head is located at the center position of the top plate, the spherical hinge socket is located at the center position of the bottom plate, and the sizes of the spherical hinge head and the spherical hinge socket are matched.

[0011] Further, an upper baffle extending downward is provided at the edge position of the upper plate, a lower baffle extending upward is provided at the edge position of the lower plate, the upper baffle and the lower baffle are opposite in position, and a spacing is reserved between the upper baffle and the lower baffle.

[0012] Furthermore, the upper baffle and the lower baffle are respectively arranged in central symmetry.

[0013] Further, the upper plate is anchored to the bottom of the pier column by shear studs.

[0014] Further, the lower plate is fixed to the pile cap by anchor bolts.

[0015] Further, both ends of the buckling-restrained brace are respectively fixedly connected to the upper plate and the lower plate, the upper end of the prestressing tendon is anchored to the top of the pier column, and the lower end sequentially passes through the pier column and the top plate and is anchored to the bottom plate.

[0016] Furthermore, the upper and lower ends of the buckling-restrained brace are respectively welded to the upper plate and the lower plate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) The present invention first proposes the concept of a connection hinge applicable to the connection between a bridge pier and a pile cap. The connection hinge of the present invention is made of steel. By the rotation of the spherical hinge, the structural period is extended, the seismic response is reduced, and the local damage at the bottom of the pier column caused by the impact force during the swing of the traditional rocking pier can be avoided; in addition, this connection hinge can replace the plastic hinge of the traditional ductile bridge pier and can effectively reduce the damage at the bottom of the pier column.

[0019] (2) The connection hinge provided by the present invention can be assembled with a precast bridge pier in a factory, the prestressing tendon is tensioned, and on-site, only the bottom plate of this connection hinge needs to be bolted to the pile cap, eliminating the on-site tensioning process of the prestressing tendon and other processes in the construction of the traditional precast bridge pier, greatly reducing the on-site installation difficulty and the time consumed, and having great convenience and time efficiency.

[0020] (3) The connection hinge of the present invention has recoverability, the prestressing tendon provides self-centering ability, and after an earthquake, only the buckling-restrained brace needs to be replaced, ensuring the rapid recovery and normal operation of the pier column after the earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the elevation structure of the present invention;

[0022] Figure 2 Schematic diagram of the side structure of the present invention;

[0023] Figure 3 is Figure 1 schematic diagram of the flat cross-section in;

[0024] Figure 4 Schematic diagram of the movement of the connection hinge during an earthquake;

[0025] The markings in the figure are:

[0026] 1 is the pier column, 2 is the shear stud, 3 is the upper plate, 4 is the lower plate, 5 is the buckling-restrained brace, 6 is the prestressed tendon, 7 is the anchor bolt, 8 is the bearing platform, 9 is the top plate, 10 is the spherical hinge head, 11 is the upper baffle, 12 is the spherical hinge socket, 13 is the bottom plate, 14 is the lower baffle. Specific embodiments

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0028] In the following embodiments or examples, if there is no specifically described functional component or structure, it indicates that they are all conventional components or structures adopted in the art to achieve the corresponding functions.

[0029] To be applicable to the rapid connection of precast segmental bridge piers and bearing platforms, the present invention provides a connection hinge applicable to precast segmental bridge piers, and its structure is shown in Figures 1 to 3 as shown, including an upper plate 3, a lower plate 4, a buckling-restrained brace 5 and a prestressed tendon 6. The upper plate 3 is arranged at the bottom of the pier column 1, the lower plate 4 is fixed on the bearing platform 8, and the middle regions of the upper plate 3 and the lower plate 4 are in spherical contact and form a spherical hinge structure. The buckling-restrained brace 5 is arranged between the upper plate 3 and the lower plate 4 and is located around the spherical hinge structure. One end of the prestressed tendon 6 is anchored at the top of the pier column 1, and the other end is anchored on the lower plate 4.

[0030] In some embodiments, please refer to again Figure 1As shown in etc., the upper plate 3 includes a top plate 9 anchored to the bottom of the pier column 1, and a spherical hinge head 10 provided on the lower surface of the top plate 9. The lower plate 4 includes a bottom plate 13 fixed on the bearing platform 8, and a spherical hinge socket 12 provided on the upper surface of the bottom plate 13. The spherical hinge head 10 and the spherical hinge socket 12 are in spherical contact to form the spherical hinge structure. Specifically, the spherical hinge head 10 and the spherical hinge socket 12 are nested with each other, so that the lateral displacement of the upper plate 3 is restricted. At the same time, the spherical hinge head 10 is supported on the spherical hinge socket 12. The spherical hinge head 10 bears the vertical load and can rotate relative to the spherical hinge socket 12.

[0031] Optionally, the distance between the top plate 9 of the upper plate 3 and the spherical hinge socket 12 of the lower plate 4 should be greater than the vertical displacement of the top plate 9 when the top plate 9 rotates to the maximum design rotation angle.

[0032] In a more specific embodiment, the corner position where the spherical hinge socket 12 transitions from the spherical inner wall to the platform section is provided with a chamfer.

[0033] In a more specific embodiment, the spherical hinge head 10 is located at the center of the top plate 9, and its end is a hemisphere. The spherical hinge socket 12 is located at the center of the bottom plate 13, and the sizes of the spherical hinge head 10 and the spherical hinge socket 12 are matched.

[0034] In some embodiments, please refer to Figure 1 As shown in etc., both ends of the buckling-restrained brace 5 are fixedly connected to the upper plate 3 and the lower plate 4 respectively. The upper end of the prestressed tendon 6 is anchored at the top of the pier column 1, and the lower end passes through the pier column 1 and the top plate 9 in sequence and is anchored on the bottom plate 13. Specifically, the buckling-restrained brace 5 dissipates energy through the plastic deformation of its own (core material). It has large ductility and hysteretic energy dissipation capacity, and has the dual functions of an ordinary brace and an energy dissipation component, and can be replaced after an earthquake. Based on the principle of capacity protection, the connection strength between the buckling-restrained brace 5 and the upper plate 3 and the lower plate 4, and the anchoring strength between the lower plate 4 and the bearing platform 8 are greater than the maximum seismic force demand. The prestressed tendon 6 can be an unbonded prestressed tendon.

[0035] In a more specific embodiment, both the upper and lower ends of the buckling-restrained brace 5 are welded to the upper plate 3 and the lower plate 4 respectively.

[0036] In some embodiments, please refer to Figure 1 As shown in etc., an upper baffle 11 extending downward is further provided at the edge position of the upper plate 3, and a lower baffle 14 extending upward is further provided at the edge position of the lower plate 4. The upper baffle 11 and the lower baffle 14 are opposite in position, and a spacing is reserved between the upper baffle 11 and the lower baffle 14. The spacing between the upper baffle 11 and the lower baffle 14 should be determined according to the vertical displacement of the upper baffle 11 when the maximum design rotation angle is reached.

[0037] In a more specific embodiment, the upper baffle 11 and the lower baffle 14 are respectively arranged in central symmetry.

[0038] In some embodiments, the upper plate 3 is anchored to the bottom of the pier column 1 by shear studs 2. Since the upper plate 3 needs to transfer a large load from the pier column 1, based on the principle of capacity protection, sufficient shear studs 2 need to be provided to ensure the anchoring performance between the upper plate 3 and the pier column 1.

[0039] In some embodiments, the lower plate 4 is fixed to the bearing platform 8 by anchor bolts 7.

[0040] Under normal use conditions, the spherical hinge head 10 of the upper plate 3 bears the vertical load. The spherical hinge socket 12 of the lower plate 4 can limit the lateral displacement of the spherical hinge head 10 of the upper plate 3 and play a role in shear resistance. At the same time, the buckling-restrained brace 5 and the prestressing tendon 6 together limit the relative rotation between the upper and lower plates 4.

[0041] Under seismic action, relative rotation occurs between the spherical hinge head 10 and the spherical hinge socket 12 of the present invention, extending the structural period. The buckling-restrained brace 5 dissipates energy, and the prestressing tendon 6 is in an elastic state to provide a restoring force to achieve the self-centering function. In order to prevent the spherical hinge head 10 of the upper plate 3 from colliding with the corner where the spherical inner wall of the spherical hinge socket 12 transitions to the platform section during the rocking process, this corner should be chamfered. In order to ensure that the rotation angle of the connection hinge does not exceed the design limit under a major earthquake, upper baffles 11 and lower baffles 14 are provided for limitation.

[0042] After an earthquake, the damage is mainly concentrated on the buckling-restrained brace, and the main structure is not damaged. After the earthquake, only energy-dissipating devices such as the buckling-restrained brace 5 need to be replaced. Due to its own structural characteristics, the buckling-restrained brace 5 can yield under both compression and tension, has excellent deformation capacity and hysteretic energy-dissipating capacity, and is simple in construction and convenient for maintenance.

[0043] The connection hinge of the present invention can achieve the rapid connection between the precast pier and the bearing platform 8, further reducing the workload at the construction site. The prestressing tendon 6 is tensioned and anchored on the bottom plate of the connection hinge in the factory in advance. At the construction site, only a simple connection of this connection device with the bearing platform 8 is required, which will have great convenience and time-cost advantages.

[0044] Each of the above embodiments can be implemented alone, or any two or more of them can be combined for implementation.

[0045] The above embodiments will be described in more detail below with reference to specific examples.

[0046] Example 1:

[0047] As Figures 1 to 4As shown in the figure, this embodiment provides a connecting hinge applicable to precast segmental piers. The connecting hinge mainly includes: an upper plate 3, a lower plate 4, a buckling-restrained brace 5, and a prestressing tendon 6. The upper plate 3 is anchored to the bottom of the pier column 1; a buckling-restrained brace 5 is arranged between the upper plate 3 and the lower plate 4, and the buckling-restrained brace 5 connects the upper plate 3 and the lower plate 4 by welding; a prestressing tendon 6 is also arranged between the upper plate 3 and the lower plate 4, with one end anchored at the top of the pier column 1 and the other end anchored on the bottom plate 13 of the lower plate; the lower plate 4 is fixed on the bearing platform 8.

[0048] In this embodiment, the upper plate 3 needs to transfer a large load from the pier column 1. Based on the principle of capacity protection, sufficient shear studs 2 are arranged on the upper plate 3 to ensure the anchoring performance between the upper plate 3 and the pier column 1.

[0049] In this embodiment, the upper plate 3 includes a top plate 9, a spherical hinge head 10, and an upper baffle 11. The spherical hinge head 10 is located at the center of the top plate 9, and its end is a hemisphere; the upper baffle 11 is located at the outer position below the top plate 9 and is a centrally symmetric structure; the lower plate 4 includes a spherical hinge socket 12, a bottom plate 13, and a lower baffle 14; the spherical hinge socket 12 is located at the center of the bottom plate 13, and the size of the spherical hinge socket 12 matches that of the spherical hinge head 10.

[0050] In this embodiment, the spherical hinge head 10 and the spherical hinge socket 12 are nested with each other, so that the lateral displacement of the upper plate 3 is restricted; the spherical hinge head 10 is supported on the spherical hinge socket 12, and the spherical hinge head 10 bears the vertical load and can rotate relative to the spherical hinge socket 12 at the same time.

[0051] In this embodiment, the buckling-restrained brace 5 is connected to the upper plate 3 and the lower plate 4 by welding, and dissipates energy through the plastic deformation of the core material. It has good ductility and hysteretic energy dissipation capacity, and has the dual functions of an ordinary brace and an energy dissipation component, and can be replaced after an earthquake.

[0052] In this embodiment, since the gravity belongs to the overturning moment after the connecting hinge rotates, sufficient area of prestressing tendons 6 should be set so that the restoring moment of the connecting hinge is greater than the overturning moment to ensure recoverability.

[0053] Based on the principle of capacity protection, the anchoring strength of the buckling-restrained brace 5 with the upper plate 3 and the lower plate 4, and the anchoring strength between the lower plate 4 and the bearing platform 8 are greater than the maximum seismic force demand. The vertical bearing capacity of the spherical hinge head 10 should be greater than the maximum seismic force demand. The rotation moment of the connecting hinge should be less than the equivalent yield moment at the bottom of the pier column 1, and a certain safety factor should be set to ensure that the pier column is in the elastic range.

[0054] The distance between the top plate 9 and the spherical hinge socket 12 should be greater than the vertical displacement of the top plate 9 when the top plate 9 rotates to the design rotation angle. The distance between the upper baffle 11 and the lower baffle 14 of the present invention should be determined according to the vertical displacement of the upper baffle 11 at the maximum design rotation angle.

[0055] Under normal use conditions, the spherical hinge head 10 of the upper plate bears the vertical load. The spherical hinge socket 12 can limit the lateral displacement of the spherical hinge head 10 of the upper plate and play a role in shear resistance. At the same time, the buckling-restrained brace 5 and the prestressing tendon 6 together limit the relative rotation between the upper plate 3 and the lower plate 4.

[0056] Under earthquake action, relative rotation occurs between the spherical hinge head 10 and the spherical hinge socket 12, extending the structural period. The buckling-restrained brace 5 dissipates energy, and the prestressing tendon 6 is in an elastic state, providing a restoring force to achieve the self-centering function. To prevent the spherical hinge head 10 of the upper plate from colliding with the corner where the inner spherical wall of the spherical hinge socket 12 transitions to the platform section during the rocking process, the corner should be chamfered. To prevent the rotation angle of the connecting hinge from exceeding the design limit under a major earthquake, an upper baffle 11 and a lower baffle 14 are provided for restriction.

[0057] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A connecting hinge applicable to precast and assembled bridge piers, characterized in that, It includes an upper plate, a lower plate, prestressing tendons and a buckling-restrained brace. The upper plate is arranged at the bottom of the pier column, and the lower plate is fixed on the bearing platform. The middle areas of the upper plate and the lower plate are in spherical contact and form a spherical hinge structure. One end of the prestressing tendon is anchored on the pier column, and the other end is anchored on the lower plate. The buckling-restrained brace is arranged between the upper plate and the lower plate and around the spherical hinge structure; The upper plate includes a top plate anchored to the bottom of the pier column and a spherical hinge head arranged on the lower surface of the top plate. The lower plate includes a bottom plate fixed on the bearing platform and a spherical hinge socket arranged on the upper surface of the bottom plate. The spherical hinge head and the spherical hinge socket are in spherical contact to form the spherical hinge structure; The corner position of the spherical hinge socket from the spherical inner wall to the platform section is provided with a chamfer; An upper baffle extending downward is also provided at the edge position of the upper plate, and a lower baffle extending upward is also provided at the edge position of the lower plate. The positions of the upper baffle and the lower baffle are opposite, and a spacing is reserved between the upper baffle and the lower baffle; The spacing between the top plate and the spherical hinge socket is greater than the vertical displacement of the top plate when it rotates to the design rotation angle; Both ends of the buckling-restrained brace are fixedly connected to the upper plate and the lower plate respectively. The upper end of the prestressing tendon is anchored at the top of the pier column, and the lower end sequentially passes through the pier column and the top plate and is anchored on the lower plate.

2. The connecting hinge applicable to precast segmental bridge piers according to claim 1, characterized in that, The spherical hinge head is located at the center of the top plate, the spherical hinge socket is located at the center of the bottom plate, and the sizes of the spherical hinge head and the spherical hinge socket match.

3. A connection hinge applicable to precast and assembled bridge piers according to claim 1, characterized in that, The upper baffle and the lower baffle are respectively arranged in central symmetry.

4. The connecting hinge applicable to prefabricated and assembled bridge piers according to claim 1, characterized in that, The upper plate is anchored to the bottom of the pier column by shear studs.

5. A connection hinge applicable to precast and assembled bridge piers according to claim 1, characterized in that, The lower plate is fixed on the bearing platform by anchor bolts.

6. The connecting hinge applicable to precast and assembled bridge piers according to claim 1, characterized in that, Both the upper and lower ends of the buckling-restrained brace are welded to the upper plate and the lower plate respectively.

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