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    鞏玉發(fā)，許宇虹
     (遼寧工程技術(shù)大學(xué)建筑與工程學(xué)院，阜新123000)

[摘要] 考慮鋼框架結(jié)構(gòu)與筏板-土之間相互作用的影響，并建立相應(yīng)的多質(zhì)點(diǎn)力學(xué)模型和運(yùn)動(dòng)方程。通過ANSYS進(jìn)行數(shù)值模擬，對(duì)一個(gè)12層鋼框架-筏基-土體相互作用的三維有限元模型進(jìn)行分析，充分考慮其材料非線性和接觸非線性，著重分析了筏板-地基土對(duì)上部結(jié)構(gòu)動(dòng)力特性的影響情況，包括結(jié)構(gòu)振型、周期、位移、內(nèi)力等動(dòng)力特性及地震反應(yīng)行為；并與剛性地基假定情況下的結(jié)構(gòu)計(jì)算結(jié)果進(jìn)行分析比較，為改進(jìn)實(shí)際結(jié)構(gòu)設(shè)計(jì)的安全、經(jīng)濟(jì)性提供依據(jù)。
[關(guān)鍵詞] 鋼框架；土-結(jié)構(gòu)相互作用；非線性時(shí)程分析；接觸單元

    Seismic analysis for steel frame structure considering soil-structure interaction
    Gong Yufa, Xu Yuhong
    (College ofEngineering and Architecture,  Liaoning Technical University,  Fuxin 123000,  China)

Abstract: The cooperative effects of the steel frame structure-raft-soil system were considered, and the multi particle mechanical model and the equation of motion were established. A 3D finite element model of raft-soil interaction was analyzed by using the ANSYS software, fully taking into account the nonlinear materials and nonlinear contact. The effects of the raft-soil system on the dynamic properties of the structure were analyzed regarding to vibration modes, vibration periods, displacements, internal forces and earthquake responses by numerical simulation calculation. The results were compared with those of the structure on rigid foundation and supply a basis for improving structure design safety and economy.
Keywords: steel frame;  soil-structure interaction;  nonlinear time history analysis;  contact element