防灾减灾工程学报2011，Vol.31Issue(5)：595-602,8.
汶川大地震简支梁桥落梁震害与设计对策
Unseating Damage to Simply Supported Bridges during Wenchuan Earthquake and Design Countermeasures
摘要
Abstract
The unseating damage to simply supported bridges and their main influencing factors during the Wenchuan earthquake are summarized. It is found that excepting the earthquake-induced landslide hazard, the earthquake surface rupture, near fault ground motion, punching shear failure of the abutment breast wall, the invalidity of the devices for preventing unseating damage to the bridges and the complex bridge types are main influencing factors leading to the unseating damage to the simply supported bridges. Basic seismic design idea and method to prevent unseating damage to simply supported bridges are presented in this paper, which include: (1) sliding between bridge girders and cap beams is allowed to reduce the seismic actions concentrated on the bridge piers; (2) cap beams with enough seating length are recommended for sliding between girder and pier to avoid unseating damage; (3) shear keys or cable restrainers should be used as added measures to prevent unseating damage. The design method for simply supported bridges with cable restrainers is illustrated in detail by using current seismic design code for bridges.关键词
汶川地震/简支梁桥/落梁震害/挡块/拉索限位器Key words
Wenchuan earthquake/ simply supported bridges/ unseating damage to the bridge girders/shear keys/ cable restrainers分类
天文与地球科学引用本文复制引用
王东升,王吉英,孙治国,李晓莉..汶川大地震简支梁桥落梁震害与设计对策[J].防灾减灾工程学报,2011,31(5):595-602,8.基金项目
辽宁省交通厅科技课题(090604) （090604）
