汶川地震桥梁震害与延性抗震设计探讨

首先介绍汶川地震的震源机制,然后对地震中桥梁典型震害调查情况进行描述、归纳,结果表明:上部结构以落梁、局部碰撞破坏、纵向与横向移位为主要表现形式;下部结构存在桥墩折断、混凝土剥落、开裂、挡块普遍失效等震害现象,桥梁附属结构震害以支座移位与变形、伸缩缝张开或挤压、护栏开裂为主.最后对国内外延性抗震设计,尤其是细部设计进行了对比和探讨.

Discussion on Bridge Damage in Wenchuan Earthquake and Seismic Ductility Design

The focal mechanism of Wenchuan Earthquake was introduced first.Then typical seismic damages of bridges was described and summarized after investigation of the bridges in disaster area.The results show that(1) span collapses due to unseating at expansion joints,partial collision damage,vertical and horizontal displacement are prevalent damage forms of superstructure;(2) pier shear failure,concrete spalling,cracking,shear key failure,etc.are the seismic damages on the substructure;(3) the typical damages of ...