钢-混凝土结构非线性地震反应分析方法分析-防灾减灾工程及防护工程专业论文.docxVIP

中国地震局工程力学研究所博士学位论文 中国地震局工程力学研究所博士学位论文 Abs Abstract IV IV V V Abstract As more and more seismic damage we know, we recognize that the fact that ground surface movements are multidimensional when earthquake happened. So the traditional way that simplifying the 3-D structure to 2-D model and analyzing the elastic-plastic response in one direction can not reveal the innate characteristics of earthquake response of structures. To accurately evaluate the safety of structures under seismic loading, it is necessary to make the 3-D nonlinear time-history analysis of structures. Now there are mainly two computation models can be used to do such analysis, Micro FEM Method and Macro FEM Method. The micro method directly uses the solid elements or shell elements to model real structures or members. Although the mechanical theory on which the micro method based is clear, it still face the difficulties including the establishment of models, huge computation time, etc. So the micro model is hardly applied into the nonlinear analysis of complex structures and unrealistic. The macro model has the advantages of little freedom and short computation time. Although the macro model can’t model the micro mechanism of damage precisely, it has been widely used in the nonlinear seismic analysis of structures as being an effect model. The combination of micro model and macro model is an good method to solve the nonlinear analysis of complex structures. This method still use the beam element to model structures and further mesh the beam element into many sub elements. Based on some postulations, such as plane remains plain after bending, the deformation compatibility relationship among inner sub elements can be defined. These sub elements can follow different constitute relation to well describe the stress state of elements. The fiber model method and layered model method can be categorized into such types. To seek a balance point between computation accuracy and computation cost, there are t