【摘要】 为了研究建筑结构在强震作用下的微观破坏机理以及提高建筑结构地震反应分析的精确性和可靠性,将多尺度有限元分析方法引入抗震混合试验中。根据经验将复杂结构在地震作用下表现出来的特性划分为线性,非线性以及强非线性部分,形成由宏观有限元模型模拟线性部位,微观有限元模型模拟非线性部位以及试验单元模拟用有限元单元难以模拟的强非线性部位的多尺度混合有限元模型。本文基于3层4跨Benchmark钢框架模型建立多尺度混合有限元模型进行地震反应分析。通过多尺度混合有限元模型与相应普通有限元模型之间的地震时程对比分析,验证了多尺度模型在抗震混合模拟试验中与普通有限元模型相比具有耗时相对较小同时能够得到较高精度的优越性。更多还原

【Abstract】 In order to study the damage mechanism of huge complex building structure under violent earthquake and improve the accuracy and reliability of the seismic response analysis,the hybrid simulation is applied,where a complex structure is divided into three portions,which include linear,nonlinear portion and the part we are interested in the while structure. The linear behavior of the partial structure is simulated with the macroscopic elements,the nonlinear behavior of the partial structure is simulated with the microscopic elements,and the local strong nonlinear behavior of the partial structure which we are interested in is simulated with the experimental element which is regarded as a special computing element. In this paper,a multi-scale finite element model based on three-story fourbay steel frame benchmark model is modeled by the way the beam-column joint is simulated by solid element( C3D8R) and the others are simulated by beam( B31) element except the side column at the bottom left of the while frame,which as an experimental substructure is simulated by connector,the coupling and MPC constraint are used between the different elements. Finally,make a seismic time response analysis with the finite models,which include multi-scale finite model,beam element model and solid element model. And the comparison of analysis results between multi-scale model and finite element model indicate that the building structure can be simulated very well by multi-scale model. Furthermore,the results also suggeste that not only the computational cost are saved but also the accuracy and reliability of the seismic response are improved when the while structure is multi-scaled.更多还原