A speed-locked third-order yield damper capable of self-reset

Abstract

The invention discloses a speed locking type third-order yield damper capable of realizing self-reset, comprising a speed locking device, a third-order yielding anti-buckling support and a self-resetting device which are connected in sequence; the speed locking device comprises a cylinder body, and one end of the cylinder body is fixedly connected There is a connecting cylinder, the end of the connecting cylinder away from the cylinder body is fixedly connected with the third-order yielding anti-buckling support; a piston rod is penetrated in the cylinder body, one end of the piston rod is fixedly connected with an end connecting piece after passing through the cylinder body, and the other end is passing through the cylinder body. The cylinder body is movably arranged in the connecting cylinder, the fluid medium is set in the cylinder body, the piston rod passes through the piston, the piston is located in the cylinder body, and the piston is provided with a damping hole; the end connecting piece is used to connect with the main body structure . The invention realizes the unconstrained form of the bridge structure in the normal use state and under the earthquake load, determines the opening or closing of the shock absorption device by the speed of the external load, changes the rigidity of the whole structure, and reduces the earthquake response.

Description

technical field [0001] The invention relates to the technical field of shock absorption and energy dissipation devices, in particular to a speed-locked third-order yield damper capable of realizing self-reset. Background technique [0002] Cable-stayed bridges have been widely developed in coastal areas because of their excellent mechanical performance advantages and good spanning capacity. my country's coastal areas are located in the Pacific Rim seismic zone and are mainly affected by the North China seismic zone and the southeastern coastal seismic zone. As a key component of national infrastructure, bridge structures are particularly important in response to earthquake disasters. [0003] With the introduction of seismic isolation design theory in the 1990s, the seismic method of cross-sea bridges shifted from the traditional ductile seismic design method to providing additional damping through local deformation by setting appropriate energy-dissipating and shock-absorbi...

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Problems solved by technology

Sea-crossing cable-stayed bridges are greatly affected by temperature. Under normal operating conditions, the deformation of the main girder caused by temperature needs to be considered. The end of the ordinary anti-buckling support beam is directly connected to the main structure, which increases the rigidity of the structure and changes the constraint form. The temperature sub-internal force of the main structure of the bridge cannot be released, which increases the force demand of the main structure, which is not good for the structure

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