摘要
主震作用下桥梁结构可能已发生联间相对变位,强余震作用将进一步加剧桥梁上部结构的碰撞或落梁灾害,以某连续梁桥为例进行地震序列分析,并对比有无拉索模数伸缩缝两种情况下的地震响应,结果表明:拉索模数伸缩缝能够有效限制主余震各阶段联间相对位移,对避免主震后产生联间残余位移的桥梁结构在强余震作用下发生碰撞、落梁具有重要意义;同时,拉索模数伸缩缝使桥梁各联间协同作用,从而墩梁相对位移得到相应的控制,桥墩受力亦有所改善。
Residual displacement between girders would have occurred after the main shock.And it would get further destroy（like pounding and unseating）with the excitation of aftershocks.Conclusions draw from the comparation on the response of continuous bridge with or without Cable-sliding expansion joints（CMEJs）under the excitation of seismic sequence.Relative displacement between girders gets effective restrained during the whole seismic process with the CMEJs which get great meaning for avoiding pounding and unseating.With the contribution of the CMEJs,all the girders work together causing the relative displacement between girder and the pile decreased.And the pier force also gets optimized.
出处
《土木建筑与环境工程》
CSCD
北大核心
2016年第3期35-40,共6页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金(51478339
51278376
91315301)
土木工程防灾国家重点实验室基金(SLDRCE14-B-14)
江西省科技计划(20151BBG70064)~~
关键词
地震序列
拉索模数伸缩缝
联间位移
Seismic sequence
Cable-sliding modular expansion joints（CMEJs）
relative displacement between girders
