Finite Element Analysis Of The Double T Short-leg Shear Wall

In recent decades, with the higher request of high-rise residential structures, the short-leg shear wall structure system has been widely applied to the urban high-rise residential construction. Compared with ordinary shear wall and frame structure, short-leg shear wall can ensure satisfactory natural lighting and ventilation, flexible architectural composition; moreover, it can hide the beams and columns in the wall and has seismic performance and relatively good force condition. The common short-leg shear wall pier structures form include "T" type, broken line type,"+" fonts,"Z" type,"L" type and "-"fonts. Due to the small cross-sectional size character of the short-leg shear wall, the "T" type is adopted very often in practical engineering to enhance the seismic capacity of the structure.This paper is focus on finite element analysis of the double T short-leg shear wall, using well-known engineering analysis software MIDAS GEN to analyze and compare the double-T short-leg’s structure models in flange connection and in web connection. With the help of the universal finite element analysis software ANSYS, this paper do the static-force simulation analysis assuming the double T shaped short-leg shear wall structure is under flange connection and web connection. Furthermore, it compares the bearing capacity and deformability of the double-T short-leg shear wall in different ratios of axial compression and pier wall thickness. The main contents as below:First, using the engineering analysis software MIDAS GEN to do response spectrum and Push-over analysis, it comes out that if coupling wall-beam adopted in layout of structural plane of the double-T short-leg shear wall by web connection, the wall will have larger stiffness, better ductility and good condition of plastic hinge.Second, using the finite element analysis software ANSYS to analyze the double T short-leg shear wall’s status in two different connections by comparing the horizontal and vertical deformation cloud pictures, the first principal stress and shear stress cloud pictures, it shows that when the double T short-leg shear wall connected with web, its carrying capacity, deformation capacity and ductility are super to that of flange connection.Third, using the finite element analysis software ANSYS to make comparisons between two types of double-T short-leg shear wall model in different connections, that is, analyze the two models’bearing capacity and deformation capacity assuming the axial compression ratio are0.2,0.3,0.4,0.5and0.6. It comes out that both models reach the ultimate load and ultimate displacement under axial compression ratio of0.4. Meanwhile, the bearing capacity and deformation capacity of the web connection model is superior to flange connection if doing horizontal comparison assuming the two models were in different axial compression ratio.Fourth, using the finite element analysis software ANSYS to make comparisons between two types of double-T short-leg shear wall model in different connections, that is, analyze the two models’bearing capacity and deformation capacity by changing pier wall thickness ratio. The result comes out that when pier wall thickness ratio rises gradually from5.5to6, then6.5,7,7.5final8, the yield load, ultimate load, and yield displacement along with the ultimate displacement also increases. If the pier wall thickness ratio reaches to8, the ultimate load and ultimate displacement of the model increases to its highest. Meanwhile, the bearing capacity and deformation capacity of the web connection model is superior to flange connection model if doing horizontal comparison assuming the two models were in different pier wall thickness ratios.