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1 東南大學(xué)建筑設(shè)計研究院，南京，210096；2 浙江大學(xué)建筑設(shè)計研究院，杭州，310029；3 中國建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，北京，100013。

［提要］  根據(jù)一棟帶高位大跨鋼桁架轉(zhuǎn)換層建筑結(jié)構(gòu)實際工程，建立了考慮樓板面內(nèi)彈性變形高精度有限元空間質(zhì)點系計算模型，進行了采用Ritz法求解技術(shù)的模態(tài)分析、單點加速度響應(yīng)地震反應(yīng)譜分析和時程分析。結(jié)果表明，轉(zhuǎn)換鋼桁架產(chǎn)生局部振型，形成結(jié)構(gòu)薄弱環(huán)節(jié)，結(jié)構(gòu)主振周期對應(yīng)著地震力貢獻最大的振型；轉(zhuǎn)換鋼桁架位置較高及其相鄰層質(zhì)量懸殊，使得高振型對結(jié)構(gòu)動力特性影響顯著；結(jié)構(gòu)豎向剛度的非連續(xù)性改變了層地震力的分布，轉(zhuǎn)換層及其上部結(jié)構(gòu)層間位移角突變，主體結(jié)構(gòu)與鋼桁架平面外變形差異較大；地震波的頻譜特性引起主體結(jié)構(gòu)對El Centro波地震響應(yīng)最強烈，而轉(zhuǎn)換鋼桁架局部對人工波地震響應(yīng)最強烈。

［關(guān)鍵詞］  高層建筑  鋼桁架  轉(zhuǎn)換層  模態(tài)分析  地震反應(yīng)

Dynamic Analysis on Building with Transfer Steel Trusses Located at a Higher Level/Authors:Liu Jinsong1, Qiu Tao2, Wang Cuikun3, Liu Junjin3 (1 Architectural Design and Research Institute, Southeast University, Nanjing 210096, China; 2 Architectural Design and Research Institute, Zhejiang University, Hangzhou 310027， China; 3 Institute of Building Structures, CABR, Beijing 100013, China)

Abstract:According to a construction project of tall building with transfer steel trusses located at a higher lever, a three dimension calculating model considering the in-plate elastic deformation of floor is built, in which the high-precision finite element method with beam and shell elements is used. To study the seismic performance of the structure, mode frequency analysis with Ritz solution, single-point acceleration response spectrum analysis and time history analysis are applied. It is indicated that some modes corresponding to the maximum of earthquake force are principal, but others produced by steel trusses are local because of the weakness of theirs joints. Higher-modes can affect the dynamic performance of the structure evidently when transfer steel trusses are located at a higher level. The saltation of earthquake force along the height of building is caused by the discontinuous stiffness of the structure, which leads the story drift angle of structure to increase. The deformation difference between the main structure and steel trusses in Y- direction is distinct under earthquake waves. In the seismic responses of main structure caused by artificial wave, site wave and El Centro wave, that caused by El Centro is the most intense one, but in the seismic responses of transfer steel trusses, that caused by the artificial wave is the most intense one, which are caused by the spectrum characteristics of earthquake waves.

Keywords:tall building; steel truss; transfer stories; modefrequency analysis; earthquake response