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【提要】  對(duì)上海鐵路南站主站屋新型大跨度鋼屋蓋結(jié)構(gòu)的抗震性能進(jìn)行了研究。通過(guò)有限元分析,研究了影響此類(lèi)屋蓋結(jié)構(gòu)動(dòng)力特性的不同因素。得出的結(jié)果有：預(yù)應(yīng)力效應(yīng)影響屋蓋結(jié)構(gòu)的振型頻率分布；下部混凝土結(jié)構(gòu)與上部屋蓋的共同工作效應(yīng)相當(dāng)于為屋蓋提供了剛度較大的彈性支座；幾何非線性特性影響不顯著。在時(shí)程分析基礎(chǔ)上,研究了多維地震輸入對(duì)屋蓋地震響應(yīng)的影響,指出內(nèi)柱為屋蓋結(jié)構(gòu)的一個(gè)較薄弱部位；給出了拉索預(yù)應(yīng)力的初始設(shè)計(jì)值；并通過(guò)時(shí)程分析,驗(yàn)證了該預(yù)應(yīng)力設(shè)計(jì)值可以保證拉索體系在多遇和罕遇地震下均能夠正常工作。
【關(guān)鍵詞】  有限元分析  大跨度鋼屋蓋  多維地震輸入  時(shí)程分析
Seismic Analysis of the Newstyle Longspan Steel Roof Structure of Shanghai South Railway Station/Guan Haitao1,Zhou Jianlong2,Wang Jun3,Huang Dingye1,Wang Dasui2(1 Department of Building Engineering, Tongji University,Shanghai 200092,China； 2 East China Architectural Design & Research Institute,Shanghai 200002,China；3 China Academy of Building Research,Beijing 100013,China)
Abstract:The aseismic behavior is studied for the newtype and longspan steel roof structure of the main building of Shanghai South Railway Station. Factors that affect the dynamic features of the roof are studied by means of FEM analysis. Results show that the prestressing effect has influence on mode distribution, the interactive effect between the supporting structure and the roof is similar to an elastic support with high stiffness under the roof, and the large deformation effect is negligible. On the basis of time history analysis, the roof response to multiple earthquake excitations is studied and the inner columns are found to be a comparatively weak part. The prestressing force of cables is calculated and the validity of the cable system during frequently occurred and seldomly occurred earthquake is proved by time history analysis.
Keywords:FEM analysis; longspan steel roof; multiple earthquake excitations; time history analysis