Composite device for seismic resistance of tie-beam joints between bridge piers

Abstract

This utility model belongs to the technical field of bridge seismic resistance systems, and particularly relates to a composite device for seismic resistance of tie-beam joints between columns of bridge double piers. The design, which connects the connectors to the tie-beam pads with bolts, guides the plastic hinges to preferentially form at a predetermined cross-section under seismic action, preventing seismic forces from occurring in other critical parts of the columns or tie beams. This effectively protects the main load-bearing components of the main structure and improves the structure's seismic performance. Utilizing the superelastic properties of SMA material, the SMA disc springs can drive the structure to automatically reset after an earthquake, giving the joint system a recoverable function, effectively reducing the difficulty and cost of post-earthquake structural repair and improving structural practicality. The components are prefabricated, which significantly shortens construction time and improves construction efficiency during on-site installation; it also facilitates standardized production of components, which helps ensure the stability of the overall structural quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of bridge seismic resistance system, and in particular relates to a composite device for seismic resistance of tie beam joints between double piers of bridges. Background Technology

[0002] Double-column piers are widely used in various bridge projects due to their obvious advantages. However, actual seismic damage surveys have revealed that they are prone to damage modes such as joint zone failure, plastic hinge zone failure at the pier base, and tie-beam joint connection failure under seismic loading, increasing the risk of overall bridge collapse. Once such pier structures are severely damaged, repair is difficult and time-consuming, and may also cause regional traffic paralysis and secondary disasters. Optimizing their seismic performance has become a critical issue that urgently needs to be addressed.

[0003] The existing double-column pier has three main defects in seismic performance: First, traditional reinforced concrete tie-beam joints between columns experience stress concentration, concrete crushing, and steel buckling under strong earthquakes, resulting in insufficient joint ductility and energy dissipation capacity. Second, the rigid connection between the pier and the tie beam makes it difficult to coordinate deformation requirements, which can easily lead to brittle shear failure. Third, conventional seismic design relies on the plastic hinge of the pier to dissipate energy, but the plastic deformation is irreversible, resulting in large residual displacement of the structure and affecting the post-earthquake functional recoverability.

[0004] Therefore, a composite device for seismic resistance of tie-beam joints between double piers of bridges is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a composite device for seismic resistance of tie-beam joints between double piers of bridges, in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A composite device for seismic resistance of tie-beam joints between bridge piers includes: a steel sleeve, the steel sleeve being installed on the bridge pier, a connecting structure being fixedly connected to the outer wall of the steel sleeve, a first connecting plate being fixedly connected to the side of the connecting structure away from the steel sleeve, the first connecting plate being vertically arranged, a second connecting plate being connected to the first connecting plate by a plurality of first bolts, and the side of the second connecting plate away from the first connecting plate being fixedly connected to a crossbeam.

[0008] Multiple SMA composite structures are provided between the first connecting plate and the second connecting plate.

[0009] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, multiple SMA composite structures are respectively set at the four corners of the first connecting plate. Each SMA composite structure includes a second bolt, which passes through the first connecting plate and the second connecting plate. Multiple SMA disc springs are coaxially sleeved on the outside of the second bolt, and the multiple SMA disc springs are located between the first connecting plate and the second connecting plate.

[0010] In the composite device for seismic resistance of the tie beam joint between double piers of the present invention, the multiple SMA disc springs located on the same second bolt are divided into multiple buffer mechanisms. The buffer mechanism includes two buffer groups, and the buffer group includes two SMA disc springs stacked in sequence. The convex surfaces of the two buffer groups in the same buffer mechanism are abutted together.

[0011] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, the SMA disc spring located at the end abuts against a spring washer, the concave surface of the SMA disc spring is opposite to the concave surface of the spring washer, and the convex surface of the spring washer abuts against the first connecting plate or the second connecting plate.

[0012] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, the connecting structure includes two first horizontal plates, both of which are horizontally arranged. The two first horizontal plates are respectively close to the top and bottom of the first connecting plate. One end of the first horizontal plate is fixed to the first connecting plate, and the other end of the first horizontal plate is fixed to the steel sleeve. The first horizontal plate is adapted to the steel sleeve.

[0013] Two vertical plates are fixedly connected between the two first horizontal plates. Both vertical plates are fixedly connected to the first connecting plate and the steel sleeve. The two vertical plates are respectively close to the two sides of the first connecting plate.

[0014] Two second horizontal plates are fixedly connected between the two vertical plates. Both second horizontal plates are fixedly connected to the first connecting plate and the steel sleeve. The two first horizontal plates and the two second horizontal plates are arranged at equal intervals from top to bottom.

[0015] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, a plurality of first through holes are provided on both the first connecting plate and the second connecting plate. The plurality of first through holes on the first connecting plate are arranged in a one-to-one correspondence with the plurality of first through holes on the second connecting plate. The plurality of first through holes are respectively arranged on opposite sides of the first connecting plate. The plurality of first through holes on the same side are arranged at equal intervals from top to bottom. The first bolt is inserted into the two corresponding first through holes. The two ends of the first bolt are respectively inserted through the first connecting plate and the second connecting plate.

[0016] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, the first bolt is set on the side of one of the vertical plates away from the other vertical plate.

[0017] In the composite device for seismic resistance of tie beam joint between double piers of bridges according to this utility model, at least two SMA composite structures are provided at the corners of the first connecting plate or the second connecting plate. Multiple SMA composite structures are arranged at equal intervals from top to bottom. The multiple SMA composite structures located on the first connecting plate or the second connecting plate are symmetrical about the axis of the first connecting plate or the second connecting plate, both vertically and horizontally.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] In this invention, the design of connecting the connector to the tie beam pad with bolts guides the plastic hinge to form preferentially at the preset cross-section under seismic action, preventing seismic forces from occurring in other critical parts of the column or tie beam, thereby effectively protecting the main load-bearing components of the main structure and improving the structure's seismic performance. Utilizing the superelastic properties of SMA material, the SMA disc spring can drive the structure to automatically reset after an earthquake, giving the node system a recoverable function, effectively reducing the difficulty and cost of post-earthquake structural repair and improving the structure's practicality. The components are prefabricated, which significantly shortens construction time and improves construction efficiency during on-site installation; at the same time, it facilitates standardized production of components, which helps ensure the stability of the overall structural quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is an overall schematic diagram of the connecting mechanism in this utility model;

[0023] Figure 3 This is a schematic diagram of the connecting mechanism in this utility model;

[0024] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0025] Among them, 1. steel sleeve; 2. SMA composite structure; 3. first bolt; 4. first connecting plate; 5. second connecting plate; 6. connecting structure; 201. spring washer; 202. second bolt; 203. SMA disc spring; 601. first horizontal plate; 602. vertical plate; 603. second horizontal plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 4 This utility model discloses a composite device for seismic resistance of tie beam joints between double pier columns of bridges, including: a steel sleeve 1, the steel sleeve 1 is installed on the bridge pier column, a connecting structure 6 is fixedly connected to the outer side wall of the steel sleeve 1, a first connecting plate 4 is fixedly connected to the side of the connecting structure 6 away from the steel sleeve 1, the first connecting plate 4 is vertically arranged, the first connecting plate 4 is connected to a second connecting plate 5 by a plurality of first bolts 3, and the side of the second connecting plate 5 away from the first connecting plate 4 is fixedly connected to a crossbeam.

[0029] Multiple SMA composite structures 2 are provided between the first connecting plate 4 and the second connecting plate 5.

[0030] In one alternative embodiment, multiple SMA composite structures 2 are respectively disposed at the four corners of the first connecting plate 4. Each SMA composite structure 2 includes a second bolt 202, which passes through the first connecting plate 4 and the second connecting plate 5. Multiple SMA disc springs 203 are coaxially sleeved on the outer side of the second bolt 202, and the multiple SMA disc springs 203 are all located between the first connecting plate 4 and the second connecting plate 5.

[0031] In one alternative, multiple SMA disc springs 203 located on the same second bolt 202 are divided into multiple buffer mechanisms. Each buffer mechanism includes two buffer groups, each buffer group including two SMA disc springs 203 stacked in sequence. The convex surfaces of the two buffer groups within the same buffer mechanism are arranged in abutment.

[0032] In one alternative embodiment, the SMA disc spring 203 located at the end abuts against a spring washer 201, with the concave surface of the SMA disc spring 203 facing the concave surface of the spring washer 201, and the convex surface of the spring washer 201 abutting against the first connecting plate 4 or the second connecting plate 5.

[0033] In one alternative embodiment, the connecting structure 6 includes two first horizontal plates 601, both of which are horizontally arranged. The two first horizontal plates 601 are respectively close to the top and bottom of the first connecting plate 4. One end of the first horizontal plate 601 is fixedly connected to the first connecting plate 4, and the other end of the first horizontal plate 601 is fixedly connected to the steel sleeve 1. The first horizontal plate 601 is adapted to the steel sleeve 1.

[0034] Two vertical plates 602 are fixedly connected between the two first horizontal plates 601. Both vertical plates 602 are fixedly connected to the first connecting plate 4 and the steel sleeve 1. The two vertical plates 602 are respectively close to the two sides of the first connecting plate 4.

[0035] Two second horizontal plates 603 are fixedly connected between the two vertical plates 602. Both second horizontal plates 603 are fixedly connected to the first connecting plate 4 and the steel sleeve 1. The two first horizontal plates 601 and the two second horizontal plates 603 are arranged at equal intervals from top to bottom.

[0036] In one alternative embodiment, multiple first through holes are provided on both the first connecting plate 4 and the second connecting plate 5. The multiple first through holes on the first connecting plate 4 correspond one-to-one with the multiple first through holes on the second connecting plate 5. The multiple first through holes are respectively provided on opposite sides of the first connecting plate 4. The multiple first through holes on the same side are provided at equal intervals from top to bottom. A first bolt 3 is inserted into the two corresponding first through holes, and the two ends of the first bolt 3 extend out of the first connecting plate 4 and the second connecting plate 5 respectively.

[0037] In one alternative, the first bolt 3 is located on the side of one of the uprights 602 away from the other upright.

[0038] In one alternative embodiment, at least two SMA composite structures 2 are provided at the corners of the first connecting plate 4 or the second connecting plate 5. The multiple SMA composite structures 2 are arranged at equal intervals from top to bottom. The multiple SMA composite structures 2 located on the first connecting plate 4 or the second connecting plate 5 are symmetrical vertically and horizontally along the axis of the first connecting plate 4 or the second connecting plate 5.

[0039] Specific examples

[0040] The composite device includes a steel sleeve 1, 20 first bolts 3 (M12 high-strength bolts), 8 second bolts 202 (M20 long bolts), multiple SMA disc springs 203, and two steel plates. One steel plate serves as a first connecting plate 4, and the other as a second connecting plate 5, which is a tie beam pad. The steel sleeve 1 is connected to the bridge pier through a fully grouted sleeve. A connecting structure 6 is welded to the back of the first connecting plate 4. The connecting structure 6 is welded to the outer wall of the steel sleeve 1 and is adapted to fit the steel sleeve 1. Full penetration welding is used for welding, and to ensure the safety and reliability of the structure, the weld grade is specified as a Class I weld.

[0041] Two second through holes are respectively opened at the four corners of the first connecting plate 4 and the second connecting plate 5. The diameter of the second through holes is 20mm and the spacing is 86mm. Multiple first through holes are opened between two adjacent second through holes on the same side. The diameter of the first through holes is 12mm and the spacing is 60mm. The distance between adjacent first through holes and second through holes is 74mm. The distance between the first through holes or second through holes on the left and right sides is 510mm.

[0042] The dimensions of a single SMA disc spring 203 are 40mm × 20mm × 2.5mm × 3.5mm, and the dimensions of a single spring washer 201 are 40mm × 20mm × 5mm × 6mm. Two SMA disc springs 203 are stacked sequentially to form a buffer group. The convex surfaces of the two buffer groups abut against each other to form a buffer mechanism. A total of 9 buffer mechanisms are provided. The length of the entire SMA composite structure 2 is 120mm.

[0043] The dimensions of the first connecting plate 4 are 800mm × 1100mm, and the dimensions of the second connecting plate 5 are 600mm × 920mm.

[0044] According to the design requirements, the required steel sleeve 1 is prefabricated in the factory. The steel sleeve 1 is a fully grouted sleeve. There are 20 first bolts 3, 8 second bolts 202, 9 buffer mechanisms on the second bolts 202, first connecting plate 4, second connecting plate 5, prefabricated tie beam, etc.

[0045] Prepare grouting equipment, wrenches, welding machines, and other construction tools. Measure and mark the installation positions of components at the midpoint of the bridge piers according to the design drawings.

[0046] Using a fully grouted sleeve, the steel sleeve 1 is accurately installed at the marked position on the bridge pier, and the steel sleeve 1 is firmly connected to the bridge pier through grouting and other methods.

[0047] First, weld the first connecting plate 4, the first horizontal plate 601, the vertical plate 602, and the second horizontal plate 603 to ensure the welding quality meets the requirements. Then, weld the welded connecting structure 6 to the steel sleeve 1 according to the designed curved shape, ensuring a tight fit and a firm weld. Pass the second bolt 202 and the first bolt 3 through the corresponding first and second through holes on the first connecting plate 4 and the second connecting plate 5 according to the design requirements, and initially fix them but do not tighten them. Place the second connecting plate 5 on the first connecting plate 4, so that the first and second through holes on the second connecting plate 5 correspond one-to-one with the first and second through holes reserved on the first connecting plate 4. Using wrenches and other tools, tighten the first bolt 3 and the second bolt 202 in sequence according to the designed tightening torque requirements.

[0048] Connect the precast tie beam to the second connecting plate 5 and adjust its position so that the connection relationship between it and the first connecting plate 4 and the second connecting plate 5 meets the design requirements.

[0049] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A composite device for seismic resistance of tie-beam joints between double piers of bridges, characterized in that, include: A steel sleeve (1) is installed on a bridge pier. A connecting structure (6) is fixedly connected to the outer wall of the steel sleeve (1). A first connecting plate (4) is fixedly connected to the side of the connecting structure (6) away from the steel sleeve (1). The first connecting plate (4) is vertically installed. The first connecting plate (4) is connected to a second connecting plate (5) by a plurality of first bolts (3). The side of the second connecting plate (5) away from the first connecting plate (4) is fixedly connected to the crossbeam. Multiple SMA composite structures (2) are provided between the first connecting plate (4) and the second connecting plate (5).

2. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 1, characterized in that: Multiple SMA composite structures (2) are respectively disposed at the four corners of the first connecting plate (4). Each SMA composite structure (2) includes a second bolt (202), which passes through the first connecting plate (4) and the second connecting plate (5). Multiple SMA disc springs (203) are coaxially sleeved on the outer side of the second bolt (202), and the multiple SMA disc springs (203) are all located between the first connecting plate (4) and the second connecting plate (5).

3. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 2, characterized in that: The multiple SMA disc springs (203) located on the same second bolt (202) are divided into multiple buffer mechanisms. The buffer mechanism includes two buffer groups, each of which includes two SMA disc springs (203) stacked in sequence. The convex surfaces of the two buffer groups within the same buffer mechanism are arranged to abut against each other.

4. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 3, characterized in that: The SMA disc spring (203) located at the end abuts against a spring washer (201). The concave surface of the SMA disc spring (203) is opposite to the concave surface of the spring washer (201), and the convex surface of the spring washer (201) abuts against the first connecting plate (4) or the second connecting plate (5).

5. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 1, characterized in that: The connecting structure (6) includes two first horizontal plates (601), both of which are horizontally arranged. The two first horizontal plates (601) are respectively close to the top and bottom of the first connecting plate (4). One end of the first horizontal plate (601) is fixedly connected to the first connecting plate (4), and the other end of the first horizontal plate (601) is fixedly connected to the steel sleeve (1). The first horizontal plate (601) is adapted to the steel sleeve (1). Two vertical plates (602) are fixedly connected between the two first horizontal plates (601). Both vertical plates (602) are fixedly connected to the first connecting plate (4) and the steel sleeve (1). The two vertical plates (602) are respectively close to the two sides of the first connecting plate (4). Two second horizontal plates (603) are fixedly connected between the two vertical plates (602). Both second horizontal plates (603) are fixedly connected to the first connecting plate (4) and the steel sleeve (1). The two first horizontal plates (601) and the two second horizontal plates (603) are arranged at equal intervals from top to bottom.

6. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 1, characterized in that: The first connecting plate (4) and the second connecting plate (5) are provided with multiple first through holes. The multiple first through holes on the first connecting plate (4) and the multiple first through holes on the second connecting plate (5) are respectively arranged on opposite sides of the first connecting plate (4). The multiple first through holes on the same side are arranged at equal intervals from top to bottom. The first bolt (3) is inserted into the two corresponding first through holes. The two ends of the first bolt (3) are respectively inserted into the first connecting plate (4) and the second connecting plate (5).

7. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 5, characterized in that: The first bolt (3) is located on one side of one of the uprights (602) away from the other upright (602).

8. The composite device for seismic resistance of tie-beam joints between double piers of bridges according to claim 1, characterized in that: At least two SMA composite structures (2) are provided at the corners of the first connecting plate (4) or the second connecting plate (5). Multiple SMA composite structures (2) are arranged at equal intervals from top to bottom. Multiple SMA composite structures (2) located on the first connecting plate (4) or the second connecting plate (5) are symmetrical about the axis of the first connecting plate (4) or the second connecting plate (5) both vertically and horizontally.

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