Research About Seismic Behavior Of Precast Prestressed Concrete Straight Shear Wall

In recent years, with the quick advance of China's modernization and China's labor shortage, a new system of residential structures—prefabricated wall system for residential construction is concerned by the engineering because of its rapid progress, project quality, and the advantages of energy conservation. Post-tensioning technology is used to assemble prefabricated wall components 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. Compared with the whole cast wall, it has a lot of technical and economic advantages.And we do a seismic behavior experiment and finite element simulation and analysis of a precast prestressed concrete straight shear wall which is common used in residential structure. The main contents are as follows:A precast prestressed concrete shear wall model is designed and tested under cyclic lateral loading. And it is analyzed in yield load, bearing capacity, stiffness degradation, energy dissipation as well as ductility conditions by test data. The result shows that 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.Based on experiment, we do a one-way nonlinear whole process analysis to the wall. Compared with test results and finite element analysis results, we get an analysis model obtains a good agreement with the experiment resultsBased on the above, using the finite element software ANSYS to do a one-way nonlinear whole process analysis to the precast prestressed concrete straight shear wall under different axial compression ratio and effective prestress. The result appears that the ductility reduces with the axial compression ratio increasing and it is highest when carrying capacity in axial compression ratio is 0.3, then it decrease. The stiffness degenerate significantly when axial compression ratio is greater than 0.4. Considering the carrying capacity, ductility and energy dissipation, for the precast prestressed concrete shear walls on 6 to 7 degree earthquake intensity area, we suggest that it's compression ratio under their gravity loads is less than 0.4. And more conclusion is the prefabricated wall's early crack is suppressed better, the stiffness, capacity and peak load of skeleton curve increases, while the ultimate level displacement and ductility is lower.