Elastoplastic Model And Seismic Analysis Of Tall Building With Short-leg Shear Wall

Short-leg shear wall structure is a new type of structure system, which has the advantages of frame and shear wall. In recent years, this structure system has been extensively applied, because it is relatively rational in building function, structure mechanical property and building value. However theory and experiment on this structure are short, especially in elastoplastic time-history analysis.Muti-component elasoplastic model for special-shaped section shear wall is built in this paper. According to mechanical property and deformation feature of short-leg shear wall, cross section displacement function and nodal displacement are introduced and improved which consider the effect of shear-lag, and thus it is free of the restriction of plane assumption. The model built in this paper accurately imitated real conditions of short-leg shear wall, which reliability and accuration of the model are enhanced. Space stiffness matrix of T-shape, L-shape and -shape short-leg shear wall is derived by virtual work principle and variational principle. Transfer matrix from local coordinate to whole coordinate is deduced ,and transfer matrix gived rised to node deviation is derived, which is necessary to structure whole analysis.Restoring force vector in dynamic equation and restoring force model of Vertical-Line and coupling beam are probed. For Vertical-Line restoring force model, the influence of stress are considered, which make deformation and stiffness of the model rational, coupling beam restoring force model may accurately imitated real conditions of scoupling beam.DZTSD is developed by MATLAB, which is a program of elasoplastic time-history analysis in tall short-leg shear wall building. The results of DZTSD are able to show crack, yield and plastic hinge of wall and coupling beam. This program is abel to draw displacement curve, speed curve and acceleration curve of the building which undeugo earthquake.Finally, an example is calculated using DZTSD by inputing four kind of earthquake waves, including elastic analysis under conventional seism and plastic analysis under rare seism, which results show that short-leg shear wall is possessed of relatively good earthquake resistance performance. So it is worthy of extending in seven degree earthquake zones.