桥梁结构地震碰撞效应及防落梁措施研究现状

介绍了桥梁结构地震碰撞效应及防落梁措施方面的一些近期进展。在介绍了接触碰撞问题的计算理论及分析方法的基础上,对地震作用下相邻桥梁结构间碰撞效应的理论以及试验研究进展进行了回顾和总结;并针对地震中桥梁上部结构发生落梁的问题,介绍了减轻相邻梁体间碰撞的措施、桥梁伸缩缝处的支承宽度、纵向限位器的设计方法、横向抗震挡块的设计方法等研究方面的进展,分析了各国抗震设计规范对桥梁伸缩缝处支承宽度的规定,同时指出目前我国在这方面研究的欠缺。

State of Art of Current Studies on the Effect of Seismic Induced Pounding between Adjacent Bridge Decks and Falling-off Prevention Measures

The recent studies on the effect of the seismic induced pounding between adjacent bridge decks and falling-off prevention measures are introduced in this paper.Firstly,the computing theories and analytical methods of contact-pounding between adjacent bridge decks are presented.Secondly,the state of the art of the theoretical and experimental studies on pounding effects between adjacent bridge decks subjected to longitudinal earthquake is reviewed and summarized.Lastly,for measures of mitigating pounding between adjacent bridge decks,design methods of hinge seat width at expansion joints,design methods of longitudinal restrainers and design method of transverse shear keys are introduced in the light of pull-off-and-drop collapse of bridge decks during earthquake;and hinge seat widths in the seismic specifications of different countries are analyzed.Furthermore,it was indicated that the lack of studies on the effect of seismic induced pounding between adjacent bridge decks and falling-off prevention measures in China.