Numerical Simulation Of Seismic Damage Of Frame-supported Shear Wall Structure With Transfer Beam Based On Submodeling Technique

The bottom strengthening area of frame-supported shear wall structure with transfer beam contains a variety of different components having different shape and size, such as shear wall, transfer beam, frame-supporting column and so on, which engender complex force under seismic action, so it is necessary to deeply analyze its damage and plastic stress and strain.In this paper, the submodeling technique is introduced into the numerical simulation of seismic damage of frame-supported shear wall with transfer beam, the submodel of structural bottom strengthening region is built. With the aid of general finite element analysis software ABAQUS, the damage in bottom strengthening area under rare seismic action is analyzed emphatically. A frame-supported shear wall using transfer beam conversion is designed according to the current codes. First, the elastic time-history analysis of the globalmodel is runned under frequent seismic action, and the macroscopic performance metrics such as interstory drift, vertex displacement and base shear is obtained. The rationality of the structure design is verified compared with specification.Then the support layer and first two layers above transfer story is taken as submodel, and its mesh is refined by one times. The node displacement calculation results of globalmodel using coarse grid on the cutting edge is linear interpolated onto the cutting boundary nodes of submodel using refinement grid, which become one of the displacement boundary conditions of submodel. The submodeling analysis is runned and the node displacement, interlayer displacement, base shear, elastic stress and strain of the strengthening area is calculated, which is compared with the corresponding area of globalmodel. The results indicate that the four indicators calculated results are in good agreement with the corresponding indicators of globalmodel, which proves that the submodeling technique is feasible in the seismic response analysis of frame-supported shear wall structure using beam transformation and the selection scheme of submodel is reasonable.Finally the elastic-plastic interstory drift of the globalmodel under rare seismic action is calculated, and the microscopic indexes such as stress, strain and damage of the shear wall and transfer beams in bottom strengthening area is analyzed using submodeling technology. The results show that the damage of the shear wall limb in bottom strengthening area under 7 degree rare seismic action is small, the maximum compressive stress of transfer beam is no more than the peak compressive stress of concrete.