Study On Behavior Of Unstiffened Low Yield Point Steel Plate Shear Wall Structure

Low yield point steel plate shear wall(LYP-SPSW)structure has high ductility and high energy dissipation capacity.The seismic mechanism study of this kind of structure system satisfies the development requirements of high-rise buildings.The design philosophy,"combination of high performance structure and high performance materials,and combination of bearing member and the energy dissipation element",is achieved.This structure provides a better solution for ductility aseismic behavior of high-rise buildings.However,few experimental and theoretical studies on thin LYP-SPSW structure were carried out at home and abroad.The complete theoretical analysis system was not formed,leading to lack of corresponding design method.Therefore,based on the material properties of low yield point steel,the behavior of LYP-SPSW structure was systematically studied in this thesis.The influence anaylsis of edge frame was carried out.The threshold value of the frame column flexibility and the shear proportion of infill plate were further defined.Meanwhile,the design suggestions were proposed.The main work of this thesis consisted of four parts:(1)Thirty-five LYP100 and LYP160 material specimens were tested under monotonic and twelve cyclic loading patterns.The combined hardening parameters of constitutive model were calibrated and verified.The cyclic constitutive relation of two steels was obtained,which provided the basic data for performance analysis of LYP-SPSW structure.(Chapter 2)(2)Based on the finite element software ABAQUS,a nonlinear finite element approach of the thin SPSW structure was established.The results of numerical simulation were compared with typical experimental results and the accuracy and applicability of this numerical method was verified.(Chapter 3)(3)According to the numerical method,the parametric analysis of main factors,which influence the shear capacity of the unstiffened LYP-SPSW structure(including height-to-thickness ratio,span-to-height ratio and the column flexibility coefficient,totally 360 models),were carried out and the contribution of the edge frame to the bearing capacity was focused.The threshold values of the column flexibility coefficient were obtained from the aspects of stress development and load-carrying capacity.Moreover,by analyzing the load-carrying efficiency of structures,the optimal recommended value of the column flexibility coefficient was given.The results provided significant basis for the edge frame design of LYP-SPSW structure.(Chapter 4)(4)Based on the parametric analysis,the shear distributions between infill plate and edge frame were studied,and the contributions of the edge frame to load-carrying capacity were quantified by analyzing the whole forced process of the LYP-SPSW structure.The results provided necessary conditions for optimizing the design of LYP-SPSW structure(Chapter 5).