摘要
地震的发生具有丛集的特征,主震发生之后通常伴随余震,主震震级越高其余震震级亦越高,对结构的破坏越大。桥梁结构作为重要交通枢纽工程,其在整个地震序列发生时应能确保通行。为得到桥梁结构在地震系列作用下的响应,选用集集地震序列对桥梁进行地震响应分析,结果显示结构在主震作用下发生落座,余震时有发生落梁的可能,对结构设置连梁装置,验证其在地震序列中的防落梁效果。结果显示连梁装置可有效减小桥梁上、下部结构相对位移,同时可提高结构整体性,使各桥墩平均分配地震力,并能在地震序列中有效防止落梁震害的发生。
Earthquakes have the character of cluster,so aftershocks often happened after main earthquake.The more magnitude the main earthquake is,the heavier destruction the aftershocks is,so the earthquake damage to structures is huger.As an important part of lifeline engineering,bridges are required to be safety during the strong earthquake.In order to obtain the response of bridges under earthquake sequence,time-history analysis has been carried on the Chi-Chi earthquake sequence.The results show that the girders are falling down from supports under the main earthquake,and are possibly falling off the piers under aftershocks.The prevention devices of falling girder are designed for the bridge on account of the deck falling,the relative displacement between the superstructure and the substructure of the bridge is effectively reduced,the integrity and the anti-pushing rigidity of the structure are increased,and the seismic load have being well-distributed among the piers.The prevention devices can provide the efficient ultimate safety for the bridge structure under the earthquake sequence.
出处
《世界地震工程》
CSCD
北大核心
2011年第2期159-163,共5页
World Earthquake Engineering
基金
交通部规范编制项目(200402)
关键词
公路桥梁
地震序列
落梁
连梁装置
highway bridge
earthquake sequences
fall of girder
connecting beam devices
