| With the development of economy and the implementation of the industrialization of housing,the construction of prefabricated concrete structures have developed rapidly,and the research and application of this structure have gradually increased.Reinforced concrete Frame Shear wall structure is one of the most widely used structural forms in high-rise building.This kind of structure will have very serious consequences after the earthquakes.Therefore,based on the theory of nonlinear analysis,this paper simulates the process of collapsing of the Frame Shear wall structure under earthquake.Listed as follows are the research outline.(1)Based on the existing collapse failure criterion of building structure,the ultimate deformation failure criterion based on the material level is selected.That is to say,when strain of the material integral point is greater than the limit state,the material or member element is considered to be destroyed,which can well describe the essence of the collapse of the structure.(2)The anchorage performance of connecting steel bar of superimposed prefabricated shear wall is studied.Through the bondanchorage performance test of the connecting steel bars,the failure mechanism of the bond-slip behavior is analyzed,and the formula of anchorage length of connecting steel is derived.Finite element models considering the bond-slip behavior are established by using the nonlinear spring element and it has been verified to be reliable.(3)The seismic performance of single superimposed prefabricated shear wall is studied.Based on the results of existing aseismic performance test of superimposed prefabricated shear wall,the difference in seismic performance of the superimposed shear wall and the full cast-in-place shear wall is analyzed and studied.Moreover,the finite element analysis of two kinds of shear wall under low cyclic loading is made by using the shell element,which can be a reference for the collapse analysis model of the overall structure.(4)The collapse analysis of the superimposed and the full cast frame shear wall structure is made.Two types of three-dimensional finite element collapse models are established using ABAQUS/ Explicit.Firstly,the hysteresis model for beam element and damage plastic model for shell element are selected,and the failure criteria of the element is defined by the user subroutine.Secondly,the static and dynamic elastoplastic time history analysis of the simplified structure under earthquake are carried out,and progressive collapse under rare earthquake are simulated.The comparison of numerical results under different working conditions verify the validity of the progressive collapse simulation method and provide an effective basis for the rational design of the structure. |
