Research On The Hysteretic Behavior Of Channel Column With Complex Edge Stiffeners And Stiffeners In Web Of Cold-Formed Steel

In recent years,the steel structure has developed rapidly in the construction industry,and the cold-formed thin-walled steel structure has also been widely used at home and abroad.Most of the researches on cold-formed thin-walled steel structures are focused on static stability,while the researches on seismic performance are few and mostly about ordinary section members.In order to study the seismic performance of new section members,the finite element method is used to simulate the hysteretic behavior of stiffened thin walled channel members with stiffened web under axial force and horizontal cyclic loading.Then the effect of the stiffening of the web on the hysteresis performance is analyzed,and the restoring force model is established at the end.In this respect,this paper has practical engineering significance.In this paper,the finite element analysis software ABAQUS is used to verify the correctness of the finite element model,taking into account the geometric and material nonlinearity and using the shell element.This article first simulates the hysteretic behavior of the cold-formed thin-walled channel with complex curling,and analyzes the effects of axial compression ratio,slenderness ratio,web thickness ratio and hemming ratio on the hysteretic behavior of the member,The hysteresis curve,the skeleton curve,the maximum bearing capacity,the energy dissipation capacity and the ductility of the parameter component are analyzed.The analysis shows that the component with high axial compression ratio will accelerate the degradation of the strength and rigidity of the component.Hysteresis performance has a great weakening effect.The slenderness ratio is different,the stiffness of members is different,but the rate of stiffness degradation is basically the same.The ductility factor decreases with the increase of slenderness ratio,and the ultimate bending moment decreases with length.In order to solve the problem of large thickness and poor hysteresis performance of normal section web,the effect of stiffening and stiffening of web on hysteresis performance is studied in this paper.Through the stiffening ribs on the web,the web is divided into three continuous unit plates.The width ratio of the three units is divided into five forms.The numerical simulation results of different web stiffeners and stiffeners are compared.The results show that the hysteretic behavior of cold-formed channel members is improved effectively by setting web stiffeners.When the width of three Web units is equal,the hysteretic behavior of components is relatively best.Finally,by summing up the simulation results of the previous chapters,the restoring force model of the stiffened and complex coiling channel steel bending member of the stiffened web is established.It provides a reference for the elastoplastic dynamic analysis of this kind of structure。...