A negative stiffness shock-absorbing and isolating device for continuous beams

Abstract

The invention relates to a negative stiffness shock absorbing device for a continuous beam, which includes a trigger device, a sliding device, a buffer device, a fixing device, a positive stiffness spring group and a negative stiffness spring group; the top of the trigger device and the lower wing of the main beam of the continuous beam The plate is fixedly connected, and the buffer device is fixedly installed in the middle of the fixing device; the inner side of the sliding device is connected to the buffer device through a negative stiffness spring group, and the two sides of the sliding device are connected to the fixing device through a positive stiffness spring group, and the fixing device is fixed on the top of the movable pier; The invention is simple in principle, economical and reliable, not only realizes that the movable pier and the fixed pier cooperate to bear the seismic horizontal load, but also solves the problem of the increase of the overall lateral displacement stiffness of the continuous girder bridge caused by the intervention of the existing girder pier locking device, thereby causing the continuous girder bridge The problem of substantial increase in the overall seismic response can be used in the seismic design of new continuous beams and the seismic reinforcement of existing continuous beam bridges, which is convenient for popularization and application.

Description

technical field [0001] The invention relates to a negative-stiffness shock-reduction and isolation device for continuous beams, belonging to the technical field of bridge shock-reduction and isolation. Background technique [0002] In order to meet the displacement requirements caused by temperature load, creep, etc., each link of a continuous girder bridge is often provided with only one fixed pier, so that most of the longitudinal seismic load of the superstructure under earthquake action is borne by the fixed pier, and the fixed pier The seismic capacity of the continuous girder bridge is difficult to meet the seismic demand, and the longitudinal seismic displacement response of the continuous girder bridge is relatively large, which easily causes damage to expansion joints and supports. It is an effective method to reduce the seismic response of continuous beams by changing the single stress state of the fixed pier, giving full play to the seismic potential of the movabl...

AI Technical Summary

Problems solved by technology

But at present there are some problems in the connecting device that makes the movable pier and the beam body locked. Although existing devices such as Lock-up device and deadlock pin device can realize the locking function of the movable pier and the beam body, the activation of the locking device changes. The structural system of the continuous girder bridge is established, and the force transmission path is generated between the main girder and the movable pier, which increases the overall stiffness of the continuous girder bridge, resulting in a decrease in the seismic period of the entire bridge, which leads to an increase in the seismic response of the entire bridge

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