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1、公路2009年5月第5期HIGHWAYMay12009No15文章编号:0451-0712(2009)05-0122-07中图分类号:U442155文献标识码:B汶川桥梁震害分析与抗震设计对策范立础,李建中(同济大学土木防灾国家重点实验室上海市210092)摘要:通过对汶川地震区213国道上桥梁震害的调查,结合震区梁式桥的结构特点,通过分析表明:震区梁式桥主要震害特征是由于梁底与板式橡胶支座顶产生相对滑动,梁体发生较大位移,从而引起落梁、支座悬空、挡块和伸缩缝破坏,但梁底与支座间滑动,实际上起到了隔震作用,国道213线从都江堰到映秀的梁式桥,除百花大桥外,桥梁
2、墩柱和基础本身都没有出现严重破坏的情况。针对震害现象,提出了相关抗震设计对策。关键词:汶川地震;桥梁震害;抗震设计建议1前言桥梁结构形式为简支梁(含先简支后桥面连续)和连“5112”汶川大地震所造成的损失巨大,位于震续梁桥,这些梁桥广泛采用板式橡胶支座,梁体直接中的汶川县附近道路基础设施受到严重破坏,距震搁置在支座上。通过对213国道和都汶高速公路桥中较近的213国道和都汶高速上桥梁震害最为典型梁震害的调查,发现:梁式桥的震害主要集中在落和严重,213国道(图1)的桥梁结构主要为梁式桥,梁、支座滑动、梁体位移、伸缩缝处相邻梁体间碰撞、收稿日期:2009-01-
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