摘要
为研究具有不等高基础约束的山地掉层框架结构的地震响应特征和破坏机理,及其与等高基础约束的典型框架结构的差异,设计和制作了总层数均为6层的1/8缩尺掉层RC框架结构和典型RC框架结构模型。通过振动台试验,对两者不同地震强度时的试验宏观现象及动力特性、加速度响应、位移响应、层间位移角等进行对比研究。试验分析表明:掉层RC框架结构的振型曲线及顺坡向的变形特征与典型框架结构不同,掉层RC框架顺坡向的整体变形并非剪切型,且有明显的扭转效应;掉层框架结构的破坏形式不同于典型框架结构,典型框架最终表现为部分楼层屈服机制,而掉层框架的柱铰最先出现于上接地柱端,随地震强度的增大,柱端塑性铰向掉层部分转移,掉层接地角柱底部损伤增加显著,结构在罕遇地震及更高强度的地震作用下能保证较好的整体性,但上接地柱破坏较严重。
In order to study the seismic response and failure mechanism of RC frame structures located on a slope and supported by foundations with different elevations,and to further show the difference between this type of structure and typical RC frame structures supported by foundations with same elevation,1/8 scaled six-story RC frame structure models of these two types were designed and built.The test phenomena,dynamic characteristics and seismic responses such as acceleration,displacement and inter-story drift ratio were comparatively analysed by shaking table tests under different earthquake intensities.The results from the experimental analysis show that the mode curves and deformation characteristics along the slope direction of these two structures are different.The deformation shape of the RC frame structure supported by foundations with different elevations along the slope direction is not shear-typed,and the torsional effect is remarkable.The failure mechanism of the RC frame structure supported by foundations with different elevations is different from that of the typical RC frame structure,where the latter shows a partial-story yield mode.In the RC frame structure supported by foundations with different elevations,the column hinge first appears at the end of upper embedding column,then transfer to the floors under the upper embedding end with the increase of earthquake intensity.The damage of the bottom corner column ends increases significantly with an increase in the earthquake intensity.Good integrity is guaranteed under rare earthquake and even higher intensity earthquake,although the damage of columns situated at upper embedding end is rather significant.
作者
李英民
唐洋洋
姜宝龙
姬淑艳
刘立平
LI Yingmin;TANG Yangyang;JIANG Baolong;JI Shuyan;LIU Liping(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technique for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;School of Construction Management and Real Estate,Chongqing University,Chongqing 400045,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第8期68-78,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51638002,51478067,51878101)。
关键词
山地结构
掉层RC框架结构
振动台试验
地震响应
破坏机理
structure on a slope
RC frame structure supported by foundations with different elevations
shaking table test
seismic response
failure mechanism
