(上海交通大学土木工程系， 上海 200240)

摘要: 为了研究多遇地震下柱面张弦桁架结构多点地震反应规律，采用 STCAD 软件建立了 9 个常见尺寸的结构有限元模型，再导入 SAP2000 中分别进行多点和一致激励时程分析，考虑了行波效应的影响，选取了合理视波速和不同地震波传播方向。 通过对比多点和一致激励时程分析结果，得到了多点激励对柱面张弦桁架结构地震响应的影响，以及多点激励效应随结构尺寸参数、地震波传播方向等因素的变化规律。 结果表明:多点激励对上部桁架的影响很大，对主索和撑杆的影响一般可以忽略；上部桁架多点激励效应与结构尺寸参数存在相关性；结构形式的差异性导致地震波传播方向对上部桁架多点激励效应影响很大。 根据分析结果，给出了上海地区此类柱面张弦桁架结构考虑多点激励效应后的地震作用效应调整系数。

关键词: 柱面张弦桁架结构；时程分析；多点激励；一致激励；行波效应

中图分类号:TU391 文献标志码:A 文章编号:1002￣848X(2022)01￣0078￣08

DOI:10. 19701 / j. jzjg. 20200711

Seismic response analysis of cylindrical truss string structure under multi￣supportexcitation considering traveling wave effect

LU Bokuan， GONG Jinghai

(Department of Civil Engineering， Shanghai Jiao Tong University， Shanghai 200240， China)

Abstract: In order to study rules of seismic response of cylindrical truss string structure under multi￣support excitation forfrequent earthquakes， nine common size structural finite element models were established using the software STCAD. Andthen time￣history analyses under multi￣support excitations and uniform excitations were performed respectively afterimporting models into software SAP2000. The influence of the traveling wave effect was considered， a reasonable apparentwave velocity and different seismic wave directions were selected. The multi￣support excitation’s impact on seismicresponses of cylindrical truss string structure and change rule of multi￣support excitation effect with regard to structural scaleparameters and seismic wave direction were obtained by comparing the results of multi￣support excitation and uniformexcitation time￣history analyses. The results show that the multi￣support excitation has a great impact on the upper truss，but the impact on cables and struts can be neglected generally. There exists correlations between upper truss multi￣supportexcitation effect and structural scale parameters. The difference of the structure form causes the seismic wave direction tohave a great influence on the multi￣support excitation effect of the upper truss. According to the analysis results， theseismic action effect adjustment coefficient of this kind of cylindrical truss structure in Shanghai area is given afterconsidering the multi￣point excitation effect.

Keywords:cylindrical truss string structure；time￣history analysis；multi￣support exitation；uniform excitation；travellingwave effect

第一作者:鲁博宽，硕士，主要从事大跨空间结构的抗震研究；Email:lubokuan1994@ sjtu. edu. cn。

[引用本文] 鲁博宽，龚景海. 柱面张弦桁架结构考虑行波效应的多点地震反应分析[J]. 建筑结构，2022，52(1):78￣85. LU Bokuan，GONG Jinghai. Seismic response analysis of cylindrical truss string structure under multi￣supportexcitation considering traveling wave effect[J]. Building Structure，2022，52(1):78￣85.