摘要
超高层结构地震剪力响应由振型分解反应谱法得到的结果经常不能满足规定的最小剪力系数要求。为此,文章简述剪力系数的概念和调整方法,以具有不同剪力系数的两个模型对比分析结构弹性、弹塑性地震响应差异,探讨剪力系数对超高层结构地震响应的影响。以通过强度和刚度调整使最小剪力系数满足规范要求的两个模型,分析不同调整方法引起的结构响应的合理性。结果表明:满足最小剪力系数的结构的弹性基底剪力大、层间位移角较小,结构的弹塑性位移响应也较小,受力状态优于不满足最小剪力系数的结构,安全性得到了提高。结构弹性倾覆力矩需求和弹塑性基底剪力按刚度调整大于按强度调整;结构弹塑性最大顶点位移和层间位移角响应相差不大,但出现刚度大\,层间位移角也大的与抗震理论相悖的情况;在满足抗震要求的情况下,构件的受力状态则是按强度调整更优,构件截面更加经济合理。
Seismic shear force response of super highrise structures,calculated by the modesuperposition response spectrum method,cannot meet the requirements of the minimum shear force coefficient in code.Therefore,the concept and adjustment method of minimum shear force coefficient were sketched in this paper.Two models with different shear force coefficients were then adopted to analyze their differences in structural elasticity and elastoplastic seismic response,and discuss the influence of shear coefficient on the seismic response of supertall buildings.Finally,the minimum shear force coefficient of the two models was adjusted to satisfy code requirements through strength and stiffness adjustment methods;rationality of the structural response induced by different methods was then analyzed.Results demonstrated that,compared with the structure without a specified minimum shear force coefficient,the elastic base shear force of the structure with a specified minimum shear force coefficient was larger,and story drift ratio and elastoplastic displacement responses were smaller,i.e.,the safety of the structures was enhanced.The elastic overturning moment demand and elastoplastic base shear values of the two models,adjusted by the stiffness adjustment method,were greater than those adjusted by the strength adjustment method.Using the two methods,the maximum vertex displacement and story drift ratio were similar,although there was an abnormal situation wherein the story drift ratio changed with stiffness.In terms of meeting seismic requirements,stress condition of the components was superior and the component crosssection more reasonable and economical by using the strength adjustment method.
作者
王贵珍
谭潜
魏俊彪
王丽萍
WANG Guizhen;TAN Qian;WEI Junbiao;WANG Liping(Chongqing Vocational Institute of Engineering,Chongqing 402260,China;CMCU Engineering Co.,Ltd.,Chongqing 400045,China;China Nerin Engineering Co.,Ltd.,Nanchang 330038,Jiangxi,China;School of Civil Engineering and Architecture,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《地震工程学报》
CSCD
北大核心
2019年第5期1161-1169,共9页
China Earthquake Engineering Journal
基金
重庆市自然科学基金项目(cstc2018jcyjA1266)
国家自然科学基金资助项目(51408092)
关键词
最小剪力
超高层建筑结构
地震响应
强度和刚度调整方法
抗震性能
minimum shear force
supertall building structure
seismic response
strength and stiffness adjustment method
seismic performance
