阅读说明：本技术 一种负泊松比胞体结构桥梁抗震耗能挡块 (Anti-seismic energy dissipation stop block of negative Poisson ratio cell structure bridge ) 是由 张旭辉 周兴 王磊 杨才千 陈秋池 于 2019-11-07 设计创作，主要内容包括：本发明公开一种负泊松比胞体结构桥梁抗震耗能挡块,该挡块由底板、后承板、后侧板、中承板、中侧板、前承板、前侧板、翼板、扶壁板、螺杆和螺帽组成。底板通过螺杆和螺帽与桥梁连接,前、中、后承板、侧板与翼板焊接成具有负泊松比特征的元宝形胞体结构,该结构仅在后承板底边与底板焊接,并用扶壁板进行加固,其他板件均与底板分离。该胞体挡块初始侧向刚度小,能有效降低撞击力；同时具有负泊松比受压强化特征,其侧向刚度会随着地震荷载不断强化,具有良好的承载和抗震适应性；此外,该挡块耗能性能良好,具备胞体弹性变形、胞壁塑性变形以及后承板塑性变形三重耗能体系,分别对应“小震不坏,中震可修,大震不倒”三水准抗震设计目标。(The invention discloses a negative Poisson ratio cell structure bridge anti-seismic energy consumption stop block which comprises a bottom plate, a rear bearing plate, a rear side plate, a middle bearing plate, a middle side plate, a front bearing plate, a front side plate, a wing plate, a wall supporting plate, a screw and a nut. The bottom plate passes through the screw rod and the nut is connected with the bridge, and preceding, well, back carrier plate, curb plate weld with the pterygoid lamina become the gold ingot shape cell body structure that has negative poisson's ratio characteristic, and this structure is only welded with the bottom plate at back carrier plate base to consolidate with holding up the wallboard, other plates all separate with the bottom plate. The cell body stop block has small initial lateral rigidity and can effectively reduce the impact force; meanwhile, the reinforced concrete has the characteristic of negative Poisson's ratio compression reinforcement, the lateral rigidity of the reinforced concrete can be continuously reinforced along with earthquake load, and the reinforced concrete has good bearing and earthquake-proof adaptability; in addition, the stop block has good energy consumption performance, has triple energy consumption systems of cell body elastic deformation, cell wall plastic deformation and rear bearing plate plastic deformation, and respectively corresponds to three-level earthquake-proof design targets of 'no damage by small earthquake, repairable by medium earthquake and no fall by large earthquake'.)

1. A negative Poisson ratio cell structure bridge anti-seismic energy dissipation stop block is characterized by comprising a bottom plate, a rear bearing plate, a rear side plate, a middle bearing plate, a middle side plate, a front bearing plate, a front side plate, a wing plate, a wall supporting plate, a screw and a nut; the bottom plate is fixed on two sides of the cap beam at the top of the pier through a screw and a nut; the bottom edge of the rear bearing plate is welded on the bottom plate and is reinforced by the buttress plate; the rear, middle and front bearing plates are respectively welded with the two rear, middle and front side plates to form an isosceles trapezoid without a bottom plate, and the edges of the side plates of the rear plate trapezoid and the middle plate trapezoid are respectively welded with the two wing plates to form a ship-shaped structure; the front plate trapezoid body and the ship-shaped structure are welded into a ingot-shaped cell body structure, and the cell body structure has the characteristic of negative Poisson ratio; except that the rear bearing plate is welded with the bottom plate, other plates are separated from the bottom plate.

2. The device as claimed in claim 1, wherein the material of each plate is selected from mild steel plate, stainless steel plate, alloy steel and plastic steel.

3. The apparatus of claim 1, wherein the welding between the plates is performed by arc welding, submerged arc welding or the like.

4. The device of claim 1, wherein the bottom plate has 4-8 holes for fastening the cover beam with screws.

5. The device of claim 1, wherein the screw is mounted on the capping beam by pre-embedding or bar-planting.

6. An apparatus as claimed in claim 1, wherein the anti-seismic blocks are removable after the energy dissipation has been deformed or destroyed, and new anti-seismic blocks are reinstalled.

Technical Field

The invention relates to a negative Poisson ratio cell structure bridge seismic energy dissipation stop block, and belongs to the field of bridge seismic and disaster prevention.

Background

Under the action of earthquake load, the bridge structure (especially the upper beam body) can generate larger lateral displacement and acceleration, so that bridge abutments are easy to damage or the upper beam body slides. In order to prevent the damage, the two sides of the cover beam and the abutment are generally provided with the stop blocks, so that on one hand, the lateral displacement of the bridge body under the action of an earthquake can be restrained, and the bridge body is prevented from sliding off; on the other hand, when the lateral impact force is too large, the stop block can be sacrificed, and partial seismic energy is consumed, so that the safety of main structures such as bridge abutments, main beams and the like is protected.

At present, common anti-seismic stop blocks comprise reinforced concrete stop blocks, rubber stop blocks, metal stop blocks and the like. The concrete stop block has high rigidity, and the beam body can generate large impact force on the stop block under the action of an earthquake, so that the stop block is easy to damage; the rubber stopper has large elasticity, so that the rubber stopper is poor in energy consumption and is not suitable for being used independently; the metal block is usually rectangular, plastic energy consumption under the action of an earthquake is mainly concentrated at four corner points, and the integral energy consumption is not ideal. The perforated metal plate stop block is also proposed to be used for energy dissipation and seismic resistance, has better deformation and energy dissipation characteristics, and has the problems of weakening of the perforated metal plate, insufficient bearing, easy damage and the like. An ideal anti-seismic stop block should have the characteristics of small lateral stiffness, high energy consumption, large bearing capacity and the like.

Disclosure of Invention

The invention aims to provide a negative poisson ratio cell structure bridge anti-seismic energy dissipation stop block which can effectively solve the problems.

In order to effectively solve the technical problems, the technical scheme adopted by the invention is as follows:

a negative Poisson ratio cell structure bridge anti-seismic energy dissipation stop block is composed of a bottom plate, a rear bearing plate, a rear side plate, a middle bearing plate, a middle side plate, a front bearing plate, a front side plate, a wing plate, a wall supporting plate, a screw and a nut; the negative Poisson ratio cell body structure is characterized in that the bottom plate is fixed on two sides of a cover beam at the top of the pier through a screw and a nut; the bottom edge of the rear bearing plate is welded on the bottom plate and is reinforced by the buttress plate; the rear, middle and front bearing plates are respectively welded with the two rear, middle and front side plates to form an isosceles trapezoid without a bottom plate, and the edges of the side plates of the rear plate trapezoid and the middle plate trapezoid are respectively welded with the two wing plates to form a ship-shaped structure; the front plate trapezoid body and the ship-shaped structure are welded into a ingot-shaped cell body structure, and the cell body structure has the characteristic of negative Poisson ratio; except that the rear bearing plate is welded with the bottom plate, other plates are separated from the bottom plate.

Particularly, the front bearing plate is directly contacted with the beam body or is separated from the beam body by a certain distance; when a small earthquake occurs, the front bearing plate firstly restrains the displacement of the beam body, and the earthquake energy is consumed through the elastic deformation of the ingot-shaped cell body structure.

Particularly, the wing plate can generate internal rotation deformation when the ingot-shaped cell body structure is impacted and extruded by a large earthquake; at the moment, the wing plate and the front bearing plate jointly restrain the displacement of the beam body, and the earthquake energy is consumed through the elastic-plastic deformation of the ingot-shaped cell body structure.

Particularly, the welding support rigidity of the rear bearing plate and the bottom plate is smaller than the lateral rigidity of the bridge abutment; when a major earthquake occurs, the rear bearing plate can generate plastic damage before the bridge pier, simultaneously consumes seismic energy, and protects the bridge structure to the maximum extent.

In particular, the materials used for the plates can be mild steel plates, stainless steel plates, alloy steel, plastic steel and the like.

In particular, the welding between the plates may be performed by arc welding, submerged arc welding, or the like.

In particular, the bottom plate is provided with 4-8 holes which can be fixed with the cover beam through screws.

Particularly, the screw can be installed on the cover beam in a pre-buried or bar-planting mode.

In particular, the block can be removed after the energy dissipation deformation or damage, and a new anti-seismic block can be installed again.

The invention has the beneficial effects that: the invention provides a negative poisson ratio cell structure bridge anti-seismic energy consumption stop block which has smaller initial lateral rigidity and effectively reduces earthquake impact force; the stop block has the characteristic of negative Poisson ratio compression strengthening, the lateral rigidity of the stop block can be continuously strengthened along with the increase of earthquake load, and the stop block has good bearing capacity and earthquake resistance adaptability; meanwhile, the energy consumption performance is excellent, and the energy consumption system has triple energy consumption systems of block cell body elastic deformation, cell wall plastic deformation and rear bearing plate plastic deformation, and respectively corresponds to three level design targets of ' small earthquake is not damaged in the middle of the structure anti-earthquake ', middle earthquake can be repaired, and large earthquake is not fallen '. The stop block has the characteristics of small lateral rigidity, large energy consumption, strong bearing capacity and the like, and is an ideal anti-seismic energy consumption device. In addition, the stop block is installed through the bolt, and repair and replacement after an earthquake are very convenient.

Drawings

Fig. 1 is a diagram showing the arrangement effect of the stop blocks on the bridge capping beam.

Fig. 2 is a left side view of the stop of the present invention.

Fig. 3 is a right side view of the stop of the present invention.

FIG. 4 is a diagram of the force deflection of the stop of the present invention under impact of beams of different seismic actions.

Reference numerals: 1-bottom plate, 2-back bearing plate, 3-back side plate, 4-middle bearing plate, 5-middle side plate, 6-front bearing plate, 7-front side plate, 8-wing plate, 9-buttress plate, 10-screw and 11-nut.

Detailed Description