A shock-absorbing and isolating system for long-span bridges

Abstract

The present invention provides a large-span bridge shock absorption and isolation system, which includes two sets of main shock absorbing assemblies, the two sets of main shock absorbing assemblies are longitudinally symmetrically arranged along the bridge deck, and each set of the main shock absorbing assemblies includes spherical bearings, A transverse damper for transverse energy dissipation and a longitudinal damper for longitudinal energy dissipation, the spherical support is provided with a shear member. The invention has the advantages of longitudinal and transverse shock absorption of the bridge and meeting the requirements of the bridge's anti-seismic performance.

Description

technical field [0001] The invention relates to the field of vibration reduction and isolation of bridges, in particular to a large-span bridge vibration reduction and isolation system. Background technique [0002] Earthquake is a serious natural disaster faced by human society. According to statistics, an average of about 5 million earthquakes occur on the earth every year, among which, destructive earthquakes above magnitude 5 account for about 1,000 times. In addition to causing casualties, earthquakes also bring huge economic and property losses to human beings. Most cities are threatened by earthquakes. As a lifeline project, long-span bridges generally cannot collapse during earthquakes, so measures must be taken to improve the seismic performance of bridges. In order to solve the above technical problems, in high-intensity earthquake areas, long-span bridges generally adopt seismic isolation systems between the bridge girder body and bridge piers. In this case, th...

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Problems solved by technology

In order to solve the above technical problems, in high-intensity earthquake areas, long-span bridges generally adopt seismic isolation systems between the bridge girder body and bridge piers. In this case, the seismic design of bridges is often difficult to meet the design requirements; while the existing long-span semi-floating system bridges generally use lead core rubber bearings or high damping rubber bearings or elastoplastic steel shock absorbing bearings, but When the bearing bears a large vertical load, the lead rubber bearing and high damping rubber bearing often have a large plane size, which requires a high installation space for the bridge, and when the bearing bears a large horizontal load, the elastic The plane size of the plastic steel shock absorber will also be larger, and there is also the problem of high installation space requirements

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