- 摘 要
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(上海交通大學(xué)土木工程系， 上海 200240)
摘要: 為了研究多遇地震下柱面張弦桁架結(jié)構(gòu)多點(diǎn)地震反應(yīng)規(guī)律，采用 STCAD 軟件建立了 9 個(gè)常見尺寸的結(jié)構(gòu)有限元模型，再導(dǎo)入 SAP2000 中分別進(jìn)行多點(diǎn)和一致激勵(lì)時(shí)程分析，考慮了行波效應(yīng)的影響，選取了合理視波速和不同地震波傳播方向。 通過對比多點(diǎn)和一致激勵(lì)時(shí)程分析結(jié)果，得到了多點(diǎn)激勵(lì)對柱面張弦桁架結(jié)構(gòu)地震響應(yīng)的影響，以及多點(diǎn)激勵(lì)效應(yīng)隨結(jié)構(gòu)尺寸參數(shù)、地震波傳播方向等因素的變化規(guī)律。 結(jié)果表明:多點(diǎn)激勵(lì)對上部桁架的影響很大，對主索和撐桿的影響一般可以忽略；上部桁架多點(diǎn)激勵(lì)效應(yīng)與結(jié)構(gòu)尺寸參數(shù)存在相關(guān)性；結(jié)構(gòu)形式的差異性導(dǎo)致地震波傳播方向?qū)ι喜胯旒芏帱c(diǎn)激勵(lì)效應(yīng)影響很大。 根據(jù)分析結(jié)果，給出了上海地區(qū)此類柱面張弦桁架結(jié)構(gòu)考慮多點(diǎn)激勵(lì)效應(yīng)后的地震作用效應(yīng)調(diào)整系數(shù)。
關(guān)鍵詞: 柱面張弦桁架結(jié)構(gòu)；時(shí)程分析；多點(diǎn)激勵(lì)；一致激勵(lì)；行波效應(yīng)
中圖分類號(hào):TU391 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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:魯博寬，碩士，主要從事大跨空間結(jié)構(gòu)的抗震研究；Email:lubokuan1994@ sjtu. edu. cn。
[引用本文] 魯博寬，龔景海. 柱面張弦桁架結(jié)構(gòu)考慮行波效應(yīng)的多點(diǎn)地震反應(yīng)分析[J]. 建筑結(jié)構(gòu)，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.
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