耗能型桥梁抗震挡块试验研究

Experimental study on energy dissipation stopper for bridge

针对桥梁常在隔震支座处设置抗震挡块以防止地震时桥梁发生横桥向落梁破坏,提出新型耗能型桥梁抗震挡块。小震时该抗震挡块保持弹性,能提供抗力限制桥面板位移;大震时该挡块屈服耗能,能减小桥梁的地震响应。设计5个抗震挡块试件病进行拟静力试验研究。试验结果表明,构造合理的耗能型桥梁抗震挡块可提供充足承载力与良好耗能能力。

Stoppers are often installed with the isolation bearings in bridges to prevent the upper girder droping from the pier during earthquakes.A novel type of energy-dissipation stopper was proposed.The stopper remains elastic and provides reaction force to restrain the displacement of upper girder during small earthquakes.On the other hand when large earthquakes occur it can yield and dissipate energy,and reduce the seismic responses of the bridge.To verify the performance of the stopper,5 specimens were designed and the experiment study was carried out.The results show that a reasonably designed stopper has reliable strength and can provide adequate energy dissipation capacity.