Interactional Analysis of Steel Plate Shear Wall with Thin Plate using Modified Slope Deflection Method

摘要

Steel Plate Shear Walls have been discussed as a lateral load resisting system in various building and especially high-rise buildings. Application of this system in high-rise buildings requires a detailed analysis of the behavior of Steel Plate Shear Walls. This is due to the fact that in high-rise and mid-rise buildings, great axial deformations of columns and aggregation of their effects in height lead to domination of bending displacement. This study aims at analysis of steel plate shear walls using plate frame interaction and modified slope-deflection method (modified slope-deflection method with consideration of axial deformation effect). The plates in this system are equaled by diagonal springs. Plate - frame interaction method is used for calculating plate stiffness. The process of analysis, which aims at reduction of analysis duration, has been conducted in a programming language, thus the analysis of the system and only by changing the values of steel shear wall parameters, is possible with high accuracy and in a very short time. The results of analysis through this method, which uses plate frame interaction method for calculation of plate stiffness, indicate the incorrect assumption of this method in formation of diagonal tension field in post-buckling phase in comparison with the finite element analysis. After modification, the accuracy of this new method has been investigated by changing the parameters of panel width and thickness in this system. Analytical results, compared with finite element analysis, showed good coincidence. The main cause of difference is in the method of calculating the length of the plate which has not buckled and played any role in the post - buckling phase.