单层球壳结构地震空间相关性效应的影响因素研究
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摘要
地震传播至结构场地时会存在空间上的变化,考虑地震空间变化性的多点输入比一致输入更符合实际.为研究地震空间变化性对单层球壳反应的影响,以行波效应为例建立地震动场,对单层球面网壳结构进行了地震多点输入与一致输入时程响应分析,分析了地震视波速、PGA和结构跨度三个因素对单层球面网壳结构地震空间相关性效应的影响程度.系统分析结果表明:地震空间变化性对结构的影响程度与结构和地震两方面因素密切相关,是否考虑地震空间变化性须由这两方面因素综合确定,当地震动场视波速较小、PGA较大时,较大跨度结构受地震空间变化性影响较大.
Ground motion varies spatially after long distance propagation to the structural site.So multiplesupport excitations considering spatial correlation is more practical than simple support excitation.The time-history response of single-layer reticulated domes under multiple-support excitations and simple support excitation was analyzed.Taking the wave-passage effect as an example,the influence of ground motion on seismic spatial correlation effect for the structures with different apparent wave velocity,PGA,spans were discussed.The results after systematical analysis indicate that the influence of seismic spatial correlation effect on the structures closely relates to the structures and ground motion,which jointly determine whether spatial correlation should be considered.When the apparent wave velocity is relatively small and PGA is relatively large,seismic spatial correlation has a larger impact on large span structures.
Ground motion varies spatially after long distance propagation to the structural site.So multiplesupport excitations considering spatial correlation is more practical than simple support excitation.The time-history response of single-layer reticulated domes under multiple-support excitations and simple support excitation was analyzed.Taking the wave-passage effect as an example,the influence of ground motion on seismic spatial correlation effect for the structures with different apparent wave velocity,PGA,spans were discussed.The results after systematical analysis indicate that the influence of seismic spatial correlation effect on the structures closely relates to the structures and ground motion,which jointly determine whether spatial correlation should be considered.When the apparent wave velocity is relatively small and PGA is relatively large,seismic spatial correlation has a larger impact on large span structures.
引文
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[4]范峰,支旭东,沈世钊.大跨度网壳结构强震失效机理研究[J].建筑结构学报,2010,31(6):153-159.FAN Feng,ZHI Xu-dong,SHEN Shi-zhao.Failure mechanism of large span reticulated shells subjected to severe earthquakes[J].Journal of Building Structures,2010,31(6):153-159.
[5]GB50011-2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]魏德敏,彭志涵,孔鹏.大跨弦支穹顶结构非一致地震响应研究[J].空间结构,2012,18(2):14-20.WEI De-min,PENG Zhi-han,KONG Peng.Investigation on seismic responses of a long-span suspen-dome structure under non-uniform earthquake excitation[J].Spatial Structures,2012,18(2):14-20.
[7]苏亮,董石麟.水平行波效应下周边支承大跨度单层球面网壳的地震反应[J].空间结构,2006,12(3):24-30.SU Liang,DONG Shi-lin.Seismic response of a large span single layer reticular dome with surrounding columns considering horizontal wave passage effect[J].Spatial Structures,2006,12(3):24-30.
[8]范峰,李玉刚,支旭东,等.地震多点输入下K8单层球面网壳结构响应研究[J].土木工程学报,2012,45(增刊1):112-116.FAN Feng,LI Yu-gang,ZHI Xu-dong,et al.Structural response analysis of K8single-layer reticulated shell structures under multiple support excitations[J].China Civil Engineering Journal,2012,45(S1):112-116.
[9]JGJ 61─2003.网壳结构技术规程[S].北京:中国建筑工业出版社,2003.
[10]范立础,王君杰,陈玮.非一致地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):358-363.FAN Li-chu,WANG Jun-jie,CHEN Wei.Response characteristics of long-span cable-stayed bridges under non-uniform seismic action[J].Chinese Journal of Computational Mechanics,2001,18(3):358-363.
[11]元兴军,李小军,周国良.行波效应对大跨刚构连续桥梁半主动控制影响分析[J].地震学报,2006,28(2):190-196.YUAN Xing-jun,LI Xiao-jun,ZHOU Guo-liang.Analysis on influence of seismic travelling wave effect on semi-active control for long-span rigid-continuous bridge[J].Acta Seismologica Sinica,2006,28(2):190-196.
[12]刘先明,叶继红,李爱群.多点输入计算方法的工程应用[J].钢结构,2006,21(1):1-4.LIU Xian-ming,YE Ji-hong,LI Ai-qun.Application of multi-support excitation calculation method in engineerings[J].Steel Construction,2006,21(1):1-4.
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