Energy consumption type variable-rigidity anti-seismic bridge check block based on magneto-rheological body

Abstract

The invention discloses an energy consumption type variable-rigidity anti-seismic bridge check block based on a magneto-rheological body, the check block comprises a magneto-rheological vibration isolation device and a variable-rigidity rectangular cavity, and the magneto-rheological vibration isolation device is installed on the outer surface of the variable-rigidity rectangular cavity; the checkblock is small in initial rigidity, can effectively reduce damage caused by rigid collision between a beam body and the check block by means of a special triple spring and a magneto-rheological damping system in the magneto-rheological vibration isolation device when subjected to earthquake impact, has the multi-stage energy consumption characteristic, can consume energy stage by stage, and improves the anti-seismic property of a bridge. The negative poisson ratio module is installed in the variable-rigidity rectangular cavity and filled with the magneto-rheological elastomer, when the earthquake load effect changes, the internal structure of the variable-rigidity rectangular cavity is compressed along with pushing of the piston rod, the lateral rigidity of the check block is continuouslyenhanced, and the rigidity requirements under the earthquake load effects of different strengths can be met. The check block has good adaptability and enough bearing capacity, and is an ideal bridgeanti-seismic check block.

Description

technical field [0001] The invention relates to the technical field of bridge stoppers, in particular to an energy-dissipating variable-stiffness anti-seismic bridge stopper based on a magneto-rheological body. Background technique [0002] During the earthquake, the bridge structure has a large lateral displacement and acceleration due to the seismic load, resulting in problems such as the main girder slipping and hanging in the air. By setting the stopper on the cover beam, the large lateral displacement of the bridge girder under the earthquake can be limited. Displacement to prevent the beam body from sliding down. At the same time, the shock absorbing device on the stopper can dissipate the impact energy between the beam body and the stopper under the action of an earthquake, and prevent irreversible damage caused by rigid collision. [0003] In the prior art, the common block form is on both sides of the top of the cover beam, and the vertical reinforcement reserved af...

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Problems solved by technology

[0003] In the prior art, the common block form is on both sides of the top of the cover beam, and the vertical reinforcement reserved after the cover beam is poured is poured into an integral reinforced concrete block. During the earthquake, if the beam body experiences excessive lateral displacement, the stopper cannot provide the function of shock absorption and energy consumption. Due to the excessive rigidity, the beam body will collide with the stopper rigidly, which will easily cause brittle failure of the stopper and the beam body Local damage will cause damage to the cap girder and the lower pier, and even cause the bridge to slide. Therefore, it is necessary to install a stopper that has the function of variable lateral stiffness, can take effective shock absorption and energy consumption measures, and can provide sufficient bearing capacity. especially important

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