Aseismic Performance And Design Method Analysis Of A Novel Mild Steel Damping Wall

This dissertation presents a new type of mild steel damping wall which is ashear-type metal damper.The new type of mild steel damping wall system was arrangedin the plane of the frame as part of the wall, and the support does not have to considercritical force and stability. The purpose of this dissertation is the solution of mild steeldamper wall in the design and application in some key technical issues, the study of theproposed new type of mild steel damping wall’s mechanical properties and earthquakeperformance,and analysis of different design parameters impact on the performance ofthe new type of mild steel damping wall, and propose the mechanical model of new typeof mild steel damping wall.Finally This dissertation put forward the new type of mildsteel damping wall structure performance-based design method, in order to facilitate thepractical engineering applications.The main research contents of this dissertation are as follows:(1)Introduce a new type of mild steel damping wall’s tructure characteristics, basicworking principle and design method.(2) In order to investigate the performance of the new shear-type metal damper，bothbasic performance test and fatigue test of the damping wall is carried out based on thegiven loading condition program in this dissertation. The constitutive model for the newdamping wall is obtained from the experiment study. Experimental results indicate thatthe new mild damping wall possesses stable and effective energy dissipation capacity andexcellent fatigue performance. Considering out-of-plane deformation of the dampingwall, a specimen with initial eccentric deformation is tested and the influence of theout-of-plane deformation upon the performance of the damping wall is studied. Testresults show that the novel shear-type mild steel damping wall of eccentricity still showgood hysteretic and fatigue properties while damper stiffness, energy dissipation capacity,etc, are reduced to different extent, especially under fatigue test.(3) A refined finite element model of the new mild damping wall is developedwithin environment of ABAQUS and numerical simulation the wall is then conducted inthis dissertation. The numerical results match very well with the experimental datum.And considering effect of slenderness parameter Rw,stiffener rigidity rs/r＊s, aspect ratioαsand flange rigidity tf/tw. Moreover, simulation results using Bouc-Wen model are ingood agreement with experimental results, and Bouc-Wen model can be used asmechanics analysis model of the new shear-type mild steel damping wall in energy dissipated structural design.(3) Considering the influence of aftershcok and structural damage, a mild steeldamping wall structure seismic design method based on the damage performance isproposed, and establish the structural elastic-plastic model, given structuralconsiderations of aftershocks damage performance, and the design method is applied toengineering instance.Studies have shown that the new mild steel damping wall is cost-effective andconvenient in construction, which may has a wide application prospect in the near future.