Pier-table collaborative energy dissipation flexible bridge seismic system

Abstract

The present application discloses a kind of pier-tai coordination energy dissipation toughness bridge seismic system, belong to bridge engineering field, to solve the problem of insufficient bridge seismic performance and post-earthquake repair difficulty.The system includes main beam, abutment, pier and backfill behind abutment, anchor head plate is buried in backfill behind abutment, one end of anchor belt is connected with anchor head plate, the other end extends to the end of main beam through abutment back wall, and pre-tightening force is applied by anchor end arranged on main beam;Anchor belt is arranged in fan shape in filling material.Under normal operating conditions, the anchor belt can constrain the horizontal vibration of the main beam, and the compaction degree of the filling material can be improved by extruding the filling material, reducing the hidden trouble of bridgehead bumping;Under the action of earthquake, the seismic response is transmitted to the abutment through the anchor belt, the abutment and the pier are cooperatively stressed and energy dissipated, the seismic response of the pier is effectively reduced, and the survivability and post-earthquake recoverability of the bridge system are improved.The present application has reasonable structure, low cost and wide application range.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering, specifically relating to a pier-abutment coordinated resilient bridge seismic resistance system, applicable to various bridge projects with seismic fortification requirements. Background Technology

[0002] As our understanding of earthquakes and their disaster-causing mechanisms deepens, the theory and methods of bridge seismic design have continuously evolved. From early strength-based design, they have gradually developed into the ductility-based design concept widely adopted in current domestic and international seismic design codes for urban and highway bridges. Ductility-based seismic design allows the main structure, such as piers, to form plastic hinges and undergo significant deformation during strong earthquakes, thus preventing collapse. However, whether before, during, or after an earthquake, the load-bearing capacity of bridge piers, as the main vertical load-bearing components, will significantly decrease once severely damaged. Residual deformation caused by plastic damage often makes it difficult to quickly repair or restore the function of bridges after an earthquake, thus affecting emergency rescue and post-disaster recovery. Especially in urban bridges, if traffic function cannot be restored in a timely manner, it will seriously hinder the overall recovery of urban functions and cause significant socio-economic losses.

[0003] Therefore, traditional ductile seismic design, which focuses solely on "collapse resistance," is no longer adequate to meet the development needs of resilient cities. Future bridge seismic design should gradually shift towards resilient design that emphasizes easy repair and rapid recovery of functions. Traditional methods typically couple the vertical load-bearing capacity of piers with their horizontal seismic resistance, leading to significant increases in reinforcement or the use of damping and isolation devices to improve performance, often accompanied by a substantial rise in costs.

[0004] As a key component of resilient urban transportation systems, resilient bridges aim not only to prevent collapse during strong earthquakes, but also to enhance their survivability, post-earthquake functional recoverability, and structural repairability, thereby minimizing the socio-economic impacts of bridge functional disruption. Developing bridge systems with high survivability and recoverability is becoming an important new concept and structural system for high-performance bridge structures both domestically and internationally, and a crucial path to achieving bridge resilience. Summary of the Invention

[0005] The purpose of this invention is to provide a pier-abutment coordinated resilient bridge seismic resistance system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following solution: A resilient bridge seismic system with pier-abutment collaborative energy dissipation includes a main beam, an abutment, and a pier. The abutment is provided with abutment backfill material and an abutment back wall. The ends of the main beam are arranged opposite to the abutment back wall. The system also includes an anchor head plate, an anchor strip, and an anchoring end. The anchor head plate is embedded inside the backfill material. One end of the anchor band is fixedly connected to the anchor head plate, and the other end passes through the abutment back wall and extends to the end of the main beam; The anchoring end is located at the end of the main beam, and the end of the anchor band is fixedly connected to the anchoring end. The anchoring end is used to apply preload to the anchor band.

[0007] Furthermore, the anchor head plate has a cutting edge.

[0008] Furthermore, the anchoring end includes a disc spring, a steel washer, and a fastening nut; the disc spring and the steel washer are sequentially sleeved on the end of the anchor band, and the fastening nut is threadedly engaged with the end of the anchor band.

[0009] Furthermore, one end of the disc spring is in contact with the end face of the main beam, and the other end is in contact with the steel pad, while the end face of the fastening nut is in contact with the steel pad.

[0010] Furthermore, both the abutment back wall and the end of the main beam are provided with reserved holes, through which the anchor belt passes.

[0011] Furthermore, the anchor bands are arranged in a fan shape within the backfill material, with one end of the anchor band connected to the anchor head plate being distributed laterally along the bridge, and the other end of the anchor band connected to the anchoring end being arranged in a converging manner laterally along the bridge.

[0012] Furthermore, the cutting edge of the anchor head plate is positioned towards the bottom of the backfill material.

[0013] Furthermore, at least two sets of the anchor head plate, anchor strip, and anchoring end are arranged along the transverse direction of the bridge, and each set is arranged independently.

[0014] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: This invention establishes a force transmission path of "main beam → anchorage → backfill material → abutment" by setting up anchor head plates, anchor bands, and anchoring ends, changing the traditional seismic design model that relies solely on the piers for force bearing. Under seismic loading, this system enables the abutments to actively participate in resisting seismic forces, achieving coordinated force bearing between the abutments and piers. This coordinated action appropriately distributes the seismic response between the piers and abutments, effectively reducing the seismic response and damage risk of the piers, thereby significantly improving the survivability of the bridge system in strong earthquakes. Traditional ductile seismic design often leads to plastic hinges and residual deformation in bridge piers, making them difficult to repair after an earthquake. This invention, through a synergistic energy dissipation mechanism, reduces the degree of damage to bridge piers, helps maintain the bridge's traffic function after an earthquake, meets the needs of resilient cities for bridges that are "easy to repair and can quickly restore function," and minimizes the socio-economic impact of functional interruption.

[0015] This invention not only serves earthquake resistance but also offers significant benefits during normal bridge operation. The taut anchor bands act as horizontal constraints, effectively reducing the horizontal vibration of the main girder under wind and vehicle loads. Simultaneously, the anchor head plates and anchor bands with cutting edges compress the backfill material under tension, increasing its compaction and effectively reducing uneven settlement at the abutments. This alleviates or prevents the common problem of "bridge approach slab settlement," improving driving comfort and safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a resilient bridge seismic resistance system with pier-abutment coordinated energy dissipation in an embodiment of the present invention; Figure 2 This is an elevation view of the connection structure at the bridge abutment in an embodiment of the present invention; Figure 3 This is a plan view of the connection structure at the bridge abutment in an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection between the anchor head plate, anchor strip, and anchoring end in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Anchor head plate; 2. Anchor band; 3. Anchoring end; 301. Disc spring; 302. Steel pad; 303. Fastening nut; 4. Backfill material; 5. Main beam; 6. Abutment; 7. Pier; 8. Abutment back wall; 9. Pier cap; 10. Pile foundation. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figures 1 to 4As shown, this embodiment provides a resilient bridge seismic resistance system with pier-abutment collaborative energy dissipation, including a main beam 5, abutment 6, pier 7, pile cap 9, and pile foundation 10. A backfill material 4 is provided behind the abutment 6, and the abutment 6 has an abutment back wall 8. The end of the main beam 5 is positioned opposite to the abutment back wall 8. The core of this invention lies in the addition of an anchoring force transmission system, specifically including an anchor head plate 1, an anchor band 2, and an anchoring end 3.

[0021] Anchor head plate 1 is embedded deep inside the backfill material 4. In this embodiment, anchor head plate 1 is provided with a cutting edge, and the cutting edge is set towards the bottom of the backfill material 4 so that it can cut into the soil when under force.

[0022] One end of the anchor band 2 is fixedly connected to the anchor head plate 1, and the other end passes through the abutment back wall 8 and extends to the end of the main beam 5. For ease of installation, pre-drilled holes are provided at the ends of both the abutment back wall 8 and the main beam 5, through which the anchor band 2 passes. Preferably, the anchor band 2 is arranged in a fan shape within the backfill 4, specifically: the end of the anchor band 2 connected to the anchor head plate 1 is distributed laterally along the bridge to increase the contact area with the soil; the end of the anchor band 2 connected to the anchoring end 3 is converged laterally along the bridge for concentrated anchoring.

[0023] Anchor end 3 is located at the end of the main beam 5. Specifically, anchor end 3 includes a disc spring 301, a steel pad 302, and a fastening nut 303. The disc spring 301 and the steel pad 302 are sequentially sleeved on the end of the anchor band 2, and the fastening nut 303 is threadedly engaged with the end of the anchor band 2. In the installed state, one end of the disc spring 301 is in contact with the end face of the main beam 5, and the other end is in contact with the steel pad 302, while the end face of the fastening nut 303 is in contact with the steel pad 302. By tightening the fastening nut 303, the disc spring 301 is compressed, thereby applying a preload to the anchor band 2, putting the anchor band 2 in a taut state.

[0024] In addition, to enhance the reliability of the coordinated force, at least two sets of anchor head plate 1, anchor strip 2 and anchoring end 3 are set along the transverse direction of the bridge, and each set is arranged independently.

[0025] The construction method of the seismic-resistant system described in this embodiment is as follows: First, following the conventional bridge construction steps, the pile foundation 10 and the abutment 9 were constructed and poured in sequence. After curing to the specified conditions, the abutment 6 and the pier 7 were poured, and the main beam 5 was erected and installed.

[0026] Next, backfilling of the backfill material 4 is carried out. The backfill material is backfilled and compacted in layers. When the backfill reaches the design elevation of the anchor head plate 1, backfilling is paused. The anchor head plate 1 with the cutting edge is installed, and one end of the anchor band 2 is fixedly connected to the anchor head plate 1.

[0027] Subsequently, the anchor band 2 is arranged in a fan shape and passed through the pre-reserved holes on the bridge abutment back wall 8 and the main beam 5, and the anchor band 2 is temporarily fixed on the main beam 5.

[0028] Next, backfilling of the abutment fill 4 continues until the road surface elevation is reached. The abutment fill within a certain range above the top surface of the anchor strip 2 is compacted manually or with light compaction equipment to ensure compaction without damaging the anchor strip 2, thus ensuring that the anchor strip 2 obtains sufficient frictional resistance in the abutment fill 4.

[0029] Finally, after the backfill material 4 has settled and stabilized, the temporary fixing of the anchor band 2 at the end of the main beam 5 is released, and the disc spring 301 and steel pad 302 are sequentially inserted, and the fastening nut 303 is tightened. By tightening the fastening nut 303, the disc spring 301 is compressed, and the designed preload is applied to the anchor band 2, thus completing the construction.

[0030] Specifically, following the construction steps, the pile foundation 10 and the abutment 9 are constructed and poured sequentially. After curing to the specified conditions, the abutment 6 and the pier 7 are poured, and the main beam 5 is installed. The backfill material 4 behind the abutment is backfilled and compacted in layers. After backfilling to the design elevation of the anchor strip 2, the anchor head plate 1 with the cutting edge and the anchor strip 2 are installed. The anchor strip 2 is arranged in a fan shape and passes through the reserved holes in the abutment back wall 8 and the main beam 5. The anchor strip 2 is temporarily fixed on the main beam 5. Then, the backfill material 4 behind the abutment is backfilled to the road surface elevation. The backfill material 4 behind the abutment within one meter above the top surface of the anchor strip 2 is compacted manually or with a light compaction machine. Without damaging the anchor strip 2, the compaction degree of the backfill material 4 behind the abutment can be effectively guaranteed to meet the requirements, so that the fan-shaped anchor strip 2 can obtain better friction resistance in the backfill material 4 behind the abutment. The temporary fixation of the anchor band 2 on the main beam 5 is released. The disc spring 301, steel pad 302 and fastening nut 303 are installed. The fastening nut 303 is tightened to compress the disc spring 301 and apply pre-tightening force. The anchor band 2 is tightened. The tension on the anchor band 2 is equal to the pre-tightening force applied by the fastening nut 303. The construction is completed.

[0031] Specifically, under normal bridge operation, the taut anchor band 2 allows the main beam 5 to undergo minor displacement and rotational deformation under the effects of temperature, shrinkage, and creep. The disc spring 301 effectively buffers this deformation, preventing excessive local stress on the structure. At the same time, the taut anchor band 2, as a horizontal constraint, helps reduce the horizontal vibration of the main beam 5 under wind and vehicle loads. The anchor head plate 1 with the cutting edge and the anchor band 2, under tension, moderately compress the backfill material 4, which helps improve the compaction of the backfill material 4 and reduce the problem of bridge approach slab settlement caused by uneven settlement at the abutment 6.

[0032] Under seismic loading, the seismic response is transmitted through the main beam 5 to the anchorage end 3, then through the anchor band 2 and the anchor head plate 1 with a cutting edge to the backfill material 4, and finally to the abutment 6. This force transmission path enables the abutment 6 to actively participate in resisting seismic loading, forming a resilient bridge seismic resistance system with pier-abutment collaborative energy dissipation together with the other piers 7. In this process, the friction between the anchor band 2 and the backfill material 4, the cutting of the soil by the cutting edge of the anchor head plate 1, and the deformation of the disc spring 301 all dissipate some of the seismic energy. This type of bridge seismic resistance system appropriately distributes the seismic response between the piers 7 and the abutment 6. After the abutment 6 participates in bearing the load, it significantly reduces the seismic response of the piers 7, improves the survivability of the bridge system in earthquakes, and achieves the goal of resilient seismic resistance.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any modifications, equivalent changes, and alterations made within the spirit and principles of the present invention without departing from the technical solution of the present invention should be considered within the technical scope of the present invention and should be included within the protection scope of the present invention.

Claims

1. A resilient bridge seismic resistance system with pier-abutment collaborative energy dissipation, comprising a main beam (5), an abutment (6), and a pier (7), wherein a backfill material (4) is provided behind the abutment (6), the abutment (6) is provided with an abutment back wall (8), and the end of the main beam (5) is disposed opposite to the abutment back wall (8), characterized in that, It also includes the anchor head plate (1), the anchor strip (2) and the anchoring end (3); The anchor head plate (1) is embedded inside the backfill material (4); One end of the anchor band (2) is fixedly connected to the anchor head plate (1), and the other end passes through the bridge abutment back wall (8) and extends to the end of the main beam (5); The anchoring end (3) is located at the end of the main beam (5), and the end of the anchor band (2) is fixedly connected to the anchoring end (3). The anchoring end (3) is used to apply preload to the anchor band (2).

2. The pier-abutment coordinated energy dissipation resilient bridge seismic resistance system according to claim 1, characterized in that, The anchor head plate (1) has a cutting edge.

3. The resilient bridge seismic resistance system with pier-abutment coordinated energy dissipation as described in claim 1, characterized in that, The anchoring end (3) includes a disc spring (301), a steel pad (302), and a fastening nut (303); the disc spring (301) and the steel pad (302) are sequentially sleeved on the end of the anchor band (2), and the fastening nut (303) is threadedly engaged with the end of the anchor band (2).

4. The pier-abutment cooperative energy dissipation resilient bridge seismic resistance system according to claim 3, characterized in that, One end of the disc spring (301) is in contact with the end face of the main beam (5), and the other end is in contact with the steel pad (302). The end face of the fastening nut (303) is in contact with the steel pad (302).

5. The resilient bridge seismic resistance system with pier-abutment coordinated energy dissipation as described in claim 1, characterized in that, Both the abutment back wall (8) and the end of the main beam (5) are provided with reserved holes, and the anchor belt (2) passes through the reserved holes.

6. The pier-abutment coordinated energy dissipation resilient bridge seismic resistance system according to claim 1, characterized in that, The anchor band (2) is arranged in a fan shape in the backfill (4). The end of the anchor band (2) connected to the anchor head plate (1) is arranged in a dispersed manner along the transverse direction of the bridge. The end of the anchor band (2) connected to the anchoring end (3) is arranged in a converged manner along the transverse direction of the bridge.

7. The pier-abutment coordinated energy dissipation resilient bridge seismic resistance system according to claim 2, characterized in that, The cutting edge of the anchor head plate (1) is positioned facing the bottom of the backfill material (4).

8. The pier-abutment coordinated energy dissipation resilient bridge seismic resistance system according to claim 1, characterized in that, The anchor head plate (1), anchor strip (2) and anchoring end (3) are arranged in at least two sets along the transverse direction of the bridge, and each set is arranged independently.

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