巩玉发，许宇虹
     (辽宁工程技术大学建筑与工程学院，阜新123000)

[摘要] 考虑钢框架结构与筏板-土之间相互作用的影响，并建立相应的多质点力学模型和运动方程。通过ANSYS进行数值模拟，对一个12层钢框架-筏基-土体相互作用的三维有限元模型进行分析，充分考虑其材料非线性和接触非线性，着重分析了筏板-地基土对上部结构动力特性的影响情况，包括结构振型、周期、位移、内力等动力特性及地震反应行为；并与刚性地基假定情况下的结构计算结果进行分析比较，为改进实际结构设计的安全、经济性提供依据。
[关键词] 钢框架；土-结构相互作用；非线性时程分析；接触单元

    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