An energy-consuming variable-stiffness seismic bridge block based on magnetorheological body

Abstract

The invention discloses an energy-consuming variable stiffness anti-seismic bridge block based on a magnetorheological variant. The block comprises a magnetorheological vibration isolation device and a variable stiffness rectangular cavity. The magnetorheological vibration isolation device is installed in the variable stiffness. The rigidity of the outer surface of the rectangular cavity; the initial rigidity of the block is small. When subjected to earthquake shock, the unique triple spring and magnetorheological damping system inside the magnetorheological vibration isolation device can effectively reduce the rigid collision between the beam and the block. It has the characteristics of multi-level energy dissipation, which can dissipate energy step by step and improve the seismic performance of the bridge; the negative Poisson's ratio module is installed inside the variable stiffness rectangular cavity, and filled with magnetorheological elastomer, when the seismic load acts When changing, as the piston rod moves, the internal structure of the variable-stiffness rectangular cavity compresses, and the lateral rigidity of the block is continuously enhanced, which can meet the rigidity requirements under seismic loads of different strengths; the block has good adaptability and sufficient bearing capacity. It is an ideal bridge seismic block.

Description

technical field [0001] The invention relates to the technical field of bridge blocks, in particular to an energy-consuming variable stiffness anti-seismic bridge block based on a magnetorheological body. Background technique [0002] During the earthquake, the bridge structure produces large lateral displacement and acceleration due to the seismic load, which leads to problems such as the main girder slipping and hanging. Displacement to prevent the beam from slipping, and at the same time, the damping device installed on the block can dissipate the impact energy of the beam and the block under the action of the earthquake, and prevent irreversible damage caused by rigid collision. [0003] In the prior art, the common block form is that on both sides of the top of the cover beam, the vertical steel bars reserved after the pouring of the cover beam are poured into an integral reinforced concrete block. During the earthquake action, if the beam body undergoes excessive later...

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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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