The Experiment And ANSYS Analysis Of Precast Prestressed Concrete T-shaped Shear Wall With Cyclic Lateral Loading

The researches on using precast prestressed concrete wallboards as shear walls in tall building structures, which bear vertical and lateral loading of the whole structure are seldom in China.Post-tensioning technology is used in the system to assemble precast prestressed concrete wallboards into a whole wall structure, which can improve the crack resistance, integrity and rigidity of the wall and make the structure has a strong post-earthquake recovery.As a new construction system, the structural system of industrialized residence with precast prestressed concrete shear wall features sound integration, earthquake resistance and usability. In addition, the application of the highly industrialized system could speed up construction, save building material and energy, protect environment and gain good economic and social profits.The thesis makes an experiment and theoretical analysis on precast prestressed concrete T-shaped shear wall with cyclic lateral loading.First, a precast concrete T-shaped shear wall and an experimental model of cast-in-site concrete T-shaped one are constructed. Then the two shear walls are tested under cyclic lateral loading. Compared the experimental data, the two shear walls are differences in bearing capacity, ductility conditions, energy dissipation and stiffness degradation.By using the finite element software ANSYS in nonlinear and comparative analysis, the specimen agrees with the experimental model. Then the thesis respectively makes analysis for different axial compression ratio and the influences of different degree of concrete on precast concrete T-shaped shear wall in crack and limit load and deformability. Main results are as follow:Results of experiment show that:(1) The wall's damage concentrated in roots near the connection, where is the weak area of the precast prestressed concrete straight shear wall, and the wall show characteristic bending failure. The length and width of crack in precast prestressed concrete T shaped shear wall are shorter than that in cast-in-site one. After unloading, the crack in T shaped shear wall could be close, which shows its sound recovery performance.(2) Results of comparative analysis:T shaped shear wall has more crack and limit load capacity, bigger stiffness, sounder recovery performance than reinforced concrete frame-shear wall. However, its deformability and ductility is worse than cast-in-site shear wall.Results of finite element software ANSYS:when axial compression ratio is between 0.2 and 0.4., the T shaped shear wall's load capacity and stiffness rise, deformability and ductility decrease with the increase of axial compression ratio. When the intension grade of concrete is between C25 and C45, the T shaped shear wall's load capacity and deformability increase first and then decrease. When the concrete intension grade is C35, its crack opening and limit displacements reached its longest.