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Cold-formed steel members can be processed into a variety of economic cross-section form of force better performance , higher carrying capacity , the overall stiffness , and ease of processing , making simple , transport , easy to install , easy to industrialization , in light steel keel The large number of applications in the residential structure . But cold-formed steel members research has concentrated study in static , hysteretic behavior under cyclic loading and seismic capacity of such members , little study of the seismic performance of cold-formed steel members engineering significance . First , based on the stability theory and nonlinear finite element method , ANSYS software for the working platform , this paper, the Shell 181 shell element to establish a finite element analysis model of cold-formed steel members , the model can be convenient to consider the initial defect and residual stress . Secondly, the parameters of the whole process of cold-formed steel members under axial compression and shear loads analysis . According to the calculated load-displacement curve , elastic capacity , ultimate strength , Deformation , plasticity development , web thickness ratio of flange thickness ratio , slenderness ratio parameters of its stable performance . Third, the article discusses the stability of cold-formed steel members under cyclic loading . From the hysteresis curve , local buckling , and the perspective of energy consumption , skeleton curves , displacement ductility factor , and ultimate bearing capacity of the comparative analysis of the initial defects , residual stress , the web thickness ratio of flange width to thickness ratio , slenderness ratio , axial compression ratio of member cycling stability . Finally, we completed the static test , Hysteretic behavior of six cold-formed thin-walled rectangular section members and four cold-formed thin-walled rectangular section members . Failure phenomenon , hysteresis curve , local buckling , the point of view of energy consumption , skeleton curves , displacement ductility factor , ultimate bearing capacity , the comparative analysis of the axial force , the web thickness ratio of flange thickness ratio of the wedge rate , the initial defect factor in its stable performance ; obtained through the analysis of the test specimen failure mechanism , the conclusions and recommendations of the engineering design of such components meaningful .
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