（1 北京交通大学土建学院 100044；2 哈尔滨工业大学土木学院 150090）
【提要】 地震内力系数法是一种适用于空间网格结构的简洁有效的抗震设计方法，但应用于单层网壳结构时需要改进。根据单层网壳结构的受力特点，考虑弯矩影响，修正了传统地震内力系数的定义，并选取大量单层柱面网壳算例进行了常遇三维地震作用下的时程分析，观察其杆件地震内力系数取值随矢宽比、长宽比、杆件截面等参数的变化规律，发现在文中研究范围内，单层柱面网壳结构地震内力系数取值随长宽比增大有逐渐增大的趋势，随矢宽比的增大有逐渐减小的趋势。在大量统计分析的基础上，归纳出可供实际工程设计参考的
地震内力系数建议取值。
【关键词】 单层柱面网壳结构 地震内力系数 矢宽比 长宽比 杆件截面
Analysis on Seismic Response of Singlelayer Latticed Cylindrical Shells Due to Multiencountered 3dimension Earthquakes/Xing Jihui1,Qian Hongliang2,Fan Feng2,Shen Shizhao2(1 School of Civil Engineering and Architecture,Beijing Jiaotong Univ.,Beij
ing 100044,China; 2 School of Civil Eng.,Harbin Institute of Technology,Harbin 150090,China)
Abstract:Seismic force coefficient method should be improved when it is used for singlayer space frames. According to the characteristic of singlelayer space frames,the traditional definition of seismic force coefficient employing the effect of bending moment on the stress of members is modified. Large scale timehistory analysis is performed for a lot of singlelayer latticed cylindrical shells due to multiencountered 3dimension earthquakes. The
seismic force coefficients of such structures increase with the increasing of lengthspan ratios and the decreasing of risespan ratios in general in the research range. Based on the analysis result,practical seismic force coefficients for singlelayer latticed cylindrical shells are proposed.
Keywords:singlelayer latticed cylindrical shell; seismic force coefficient; risespan ratio; lengthspan ratio; member size
*国家自然科学基金资助项目(50608002)；北京交通大学“十五”专项科技基金项目(2004SM030)。