斜拉桥地震破坏的计算研究

地震曾破坏了大量的桥梁结构。然而，尽管目前世界上斜拉桥数目正以指数函数规律增长，但还没有任何斜拉桥经历过强地震，斜拉桥可能的地震破坏形式、破坏机理还是一个有待探索的领域。本文对本世纪几次大地震中严重破坏的桥梁进行损坏部分的震害原因分析，总结出一般桥梁结构地震破坏机理及破坏形式。利用大型结构分析程序ＭＳＣ／ＮＡＳＴＲＡＮ，对斜拉桥地震反应特征进行了分析，并在综合考虑结构地震反应的三维性、行波效应、非

SEISMIC DAMAGE AND COLLAPSE OF CABLE-STAYED BRIDGES

To obtain general failure feature of bridges the damage and collapse of bridges are studied based on the investigations of their seismic behavior in several past earthquakes. Advanced finite element analysis program MSC/NASTRAN is successfully used in this study to perform the seismic response analysis of cable-stayed bridge. The earthquake response characteristics of this kind of bridges which including motion coupling effects travelling wave effects nonlinearity effects and the effects of some seismic reduction devices are presented. Taking the effects metioned above into consideration the failure analysis of cable-stayed bridges are performed in both weak soil base foundation and rock base foundation. The seismic damage and collapse of cable-stayed bridges are predicted.