Experimental And Theoretical Investigation To Earthquake Resistant Behavior Of Steel Plate Shear Walls

The steel plate shear wall with excellent energy dissipation performance and good displacement ductility is widely concerned and studied by many scholars at home and abroad. It’s quite suitable for high-rise and extra-high buildings with higher earthquake resistant requirement.This paper systematically studies the thin Steel Plate Shear Walls (SPSW), the cross stiffener SPSW, the SPSW with slits and the SPSW with openings through test and numerical simulation methods. Its purpose is revealing the hysteretic performance of different types of steel plate shear wall under cyclic loading and the influence of the parameters to bearing capacity of SPSW, and further finds out the simplified calculation model of steel plate shear walls to provide reference for the design and practical application. The main research contents and conclusions are as follows:1) The hysteresis curves and skeleton curves have been gotten through the circular pseudo-static experimental study of the four types of steel plate walls. The lateral stiffness, bearing capacity, ductility factor, energy-dissipating capacity, bearing capacity degeneration、peak rigidity degradation and deformation behavior of steel plate walls have been analysis. The results show that the thin SPSW has higher lateral stiffness, carrying capacity and good ductility performance, but its pinch effect is obvious; Cross-stiffener not only strongly restrain the out-plane deformation of thin steel plate, but also remarkably improve it’s lateral stiffness and bearing capacity; The SPSW with slits has good energy-dissipating capacity, but it is weak in lateral stiffness and bearing capacity; The performance of SPSW with holes is between the SPSW with slits and the thin SPSW. The SPSW with cross stiffener has biggest resist lateral stiffness and highest bearing capacity, while the SPSW with slits has best energy-dissipation performance. Contrast the difference of performance among the four types of steel plate shear wall, it is provided reference of engineering application for design work.2) The circular pseudo-static experiments of four types of steel plate wall are simulated via ANSYS, and contrast with experimental data. Moreover, the hysteresis curves, skeleton curves, stress and deformation of steel plate are analysis. Finite elements results agree well with experimental results, it is provided the basis for expand analysis. Because of its ideal constraints, lacking of consideration of material defect and residual stress, the lateral stiffness of finite element model is bigger than its experimental ones. The contours of stress show that the maximum stress first appears on the infill plate, and then grows in the column bases and the bottom of beam-column joints with the development of stress. It will occur local buckling in the final failure due to overlarge stress. In the later period of loading, cross stiffeners can not restrain the out plane deformation of infill plate due to the stiffeners’yield even rupture.3) The influence of parameters on bearing capacity of steel plate shear walls is studied. The parameters include the depth-thickness ratio, depth-width ratio, and column rigidity, axial-load ratio of column and stiffness-to-plate rigidity ratio. The static nonlinear single-track loading to steel plate walls in relevant parameters has been done, and the load-displacement curve、stress nephogram and out plane deformation nephogram have been gotten. The bigger axial-load ratio of column, the lower horizontal ultimate bearing capacity of steel plate wall is. But it does not obviously influence the initial elastic stiffness of SPSW. When stiffness ratio of ribbed plate is higher than a certain value, tension strip can develop sufficiently, and it does not importantly improve ultimate bearing capacity of SPSW. The bigger is depth-width ratio of strip between slits; the lower is bearing capacity and resist lateral stiffness of steel plate wall.4) On the base of unidirectional batter braces computation model, it researches bidirectional batter braces and simplifying V bracing to SPSW. Equivalent bidirectional batter braces model has lower bearing capacity and initial elastic stiffness, but its whole characteristic curve is close to the curves of ANSYS shell simulation and test; V bracing model has better initial elastic stiffness, but when plastic hinges occur, its bearing capacity drops quickly, the characteristic curve is quite different from the curve of test. Through numerical regression analysis, it put forward the corresponding simplified calculation formula. To check its availability by contrast the results of SAP2000、ANSYS and experiment, then checking two project cases using simplified model.