在上下盘差异沉降作用下跨越地裂缝框架结构地震响应研究  

Seismic responses of structures across ground fissure with different settlements between hanging wall and foot wall

作　　者：熊仲明[1] 王永玮 陈轩[1] 熊威扬 XIONG Zhongming;WANG Yongwei;CHEN Xuan;XIONG Weiyang(Collage of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;University of California,Los Angeles 90024,USA)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]美国加州大学洛杉矶分校,洛杉矶90024

出　　处：《振动与冲击》2019年第10期112-118,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51278395);住房和城乡建设部科学技术项目(2016-k5-044);陕西省自然科学基础研究计划重点项目(2018JZ5008)

摘　　要：地裂缝对结构是严重安全隐患。为研究地裂缝上下盘差异沉降及地震作用对框架结构动力响应的影响,以西安f_4地裂缝场地附近框架为研究对象,利用有限元软件ANSYS/LS-DYNA建立无上下盘差异沉降地裂缝场地与结构共同作用计算模型,将计算结果与振动台试验进行对比,表现较好一致性;通过对有限元模型施加上下盘差异沉降,定量分析了框架结构加速度、位移及位移角变化规律;计算结果表明:地震作用下,地裂缝场地框架结构各层加速度及位移大于无地裂缝场地结构加速度及位移;地裂缝上下盘差异沉降使结构加速度与位移增大;同时使结构破坏早于无沉降地裂缝场地。其研究成果为深入研究地裂缝上下盘效应对上部结构地震破坏过程和损伤机理提供参考。Ground fissure is a serious threat to structures.In order to analyze the seismic responses of frame structures across ground fissure with different settlements between hanging wall and foot wall under earthquake,taking a RC frame near the ground fissure f 4 as a research object,a calculation model for the structure and ground fissure with and without different settlements was established by ANSYS/LS-DYNA.The calculation results present the same tendency with the results of shaking table tests.After applying different settlements to this model,the accelerations,displacements and displacement angles of the frame were quantitatively analysed.The results show that the accelerations and displacements of the frame across ground fissure are bigger than those of the frame on original ground.Different settlements increase the accelerations and displacements of the structure and make structure destroy more easily.The results provide a powerful basis to the further study on the failure mechanism of structures across ground fissures.

关 键 词：地裂缝 框架结构 地震响应 差异沉降 共同作用 

分 类 号：TU375.4[建筑科学—结构工程]