【摘要】 在强震作用下,桥梁上、下部结构由于动力特性的不同而发生不同相振动,从而引起梁体与挡块间的非线性碰撞。汶川大地震中,大量公路桥梁遭到严重破坏,横向抗震挡块破坏尤其严重,其中部分是由于横向碰撞而引起。针对这种碰撞现象,对正交简支梁桥、连续梁桥、斜交桥及高速铁路桥梁的横向碰撞反应进行了回顾和总结,并介绍了横桥向防撞措施及震后加固技术的研究现状,同时指出目前我国在这方面亟需解决的问题和进一步研究的方向。更多还原

【Abstract】 Strong earthquake motions can induce out-of-phase vibrations between superstructures and substructures due to differences in dynamic characteristics,which can result in nonlinear pounding between girders and shear keys if the relative displacements exceed their initial gaps.Many highway bridges were destroyed in the Wenchuan earthquake,and many lateral shear keys extensively suffered severe damage partly caused by pounding between shear keys and girders.Based on the pounding phenomenon between girders and shear keys under transverse earthquake,the pounding response of simple-supported beam bridge,continuous girder bridge,skew bridge and simple-supported box girder on the high-speed railway are reviewed and summarized systematically.The state of pounding mitigation measures and post-earthquake retrofit are presented,and some recommendations for future research on seismic response of bridges under transverse earthquakes are offered.更多还原