摘要
对于高层建筑,只有处于9度抗震设防区时才需要考虑竖向地震作用。新出现的扭转型结构因柱倾斜,竖向地震作用二阶效应大,对结构不利。目前关于此类结构竖向地震作用研究较少,本文设计8度(0.3g)区扭转型和非扭转型结构及9度区非扭转型结构,对结构进行时程分析,比较结构竖向地震作用构件内力和位移反应。结果表明:竖向地震作用对扭转型结构楼层侧移、层间位移角和梁跨中弯矩增大作用较显著;在8度(0.3g)区,每层扭转2°结构大震下有一半的参数增幅超过9度区非扭结构;每层扭转5°结构小震、中震和大震下都有一半的参数增幅超过9度区非扭结构,表明在8度(0.3g)区,每层扭转2°结构设计时仅大震作用下要考虑竖向地震,而每层扭转5°结构小震和大震作用下都要考虑竖向地震作用。
For high-rise buildings,vertical seismic effects need to be considered only if they are in a 9-degree seismic protection zone.The new torsional structures have a large second-order effect on the vertical seismic action due to the column tilt,which is detrimental to the structure.At present,there is little research on the vertical seismic action of such structures,this paper designs torsional and non-torsional structures in the 8 degree(0.3g)zone and non-torsional structures in the 9 degree zone,and carries out a time course analysis of the structures to compare the internal force and displacement response of the structural members to the vertical seismic action.The results show that the vertical seismic action has a significant effect on the lateral shift of the torsional structure floors,the inter-storey displacement angle and the increase in the beam span moment;in the 8 degree(0.3g)zone,half of the parameters of the torsional 2 degree per storey structure increase more than those of the non-torsional structure in the 9 degree zone under large earthquakes;half of the parameters of the torsional 5 degree per storey structure increase more than those of the non-torsional structure in the 9 degree zone under small,medium and large earthquakes,which indicates that the design of a 2-degree torsional structure at each storey is subject to vertical seismicity only for large earthquakes in the 8 degree(0.3g)zone,whereas a 5-degree torsional structure at each storey is subject to vertical seismicity for both small and large earthquakes.
作者
姚立
李启才
YAO Li;LI Qicai(Key Laboratory of Structural Engineering of Jiangsu Province,SUST,Suzhou 215011,China)
出处
《苏州科技大学学报（工程技术版）》
CAS
2024年第3期23-30,38,共9页
Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）
基金
江苏省中外合作办学平台联合科研项目(20191015)。
关键词
扭转型建筑
框架核心筒结构体系
结构设计
竖向地震作用
动力时程分析
torsional buildings
frame core structural system
structural design
vertical seismic action
dynamic time analysis
