Research On Lateral Performance Of Light Steel Composite Wall

In this paper,the experimental research and theoretical analysis on the lateral resistance of the light steel composite wall in the traditional light steel residence are carried out.A new type of composite wall structure,cold-formed thin-walled steel straw brick composite wall,is proposed,and its low cycle cyclic loading test and nonlinear finite element analysis are carried out.The main contents of this paper are:Quasi-static test of cold-formed thin-walled steel OSB composite wall,derivation of lateral stiffness model of light-weight steel composite wall,low cycle cyclic loading test of cold-formed thin-walled steel straw brick composite wall,nonlinear finite element analysis of cold-formed thin-walled steel straw brick composite wall.The purpose of this paper is: To summarize the mechanical characteristics of the typical light steel composite wall through the test,to establish a unified mechanical analysis model under the horizontal action,to provide a theoretical basis for the design of the lateral bearing capacity of the wall;to investigate the mechanical performance of the new composite wall through the cold-formed thin-walled steel straw brick low cycle cyclic loading test,and to focus on the key through the nonlinear finite element analysis The influence of the parameters on the lateral bearing capacity of the wall provides a basic reference for the further research and application of the new wall.In this paper,two full-scale cold-formed thin-walled steel OSB composite walls with different column spacing are designed and manufactured as test objects.It is found that the reduction of column spacing can significantly improve the bearing capacity of the wall,but has little effect on the failure mode of the wall.The main failure modes of the wall are compression cracking at the corner of OSB plate,local buckling of steel frame and failure of connection between the frame and OSB plate.Therefore,the lateral stiffness of steel frame,the horizontal shear stiffness of panel and the connection stiffness have important influence on the lateral bearing capacity of wall.Based on the experimental analysis of the cold-formed thin-walled steel OSB composite wall,the mechanical analysis model of the collaborative deformation of the frame,shear panel and connecting element,the frame shear spring element stiffness model,is established.The force balance and displacement coordination analysis of the model are carried out,the calculation formula of the lateral bearing capacity of the wall is derived,and the parameters of the wall specimen are brought into the formula to obtain the difference between the theoretical value and the experimental value of the lateral bearing capacity of the wall It’s not big,so it proves the rationality of the model.Based on the conceptual analysis of the formula for calculating the lateral bearing capacity of composite wall,it can be seen that the lateral bearing capacity of composite wall is composed of frame resistance and panel resistance,and the connection stiffness plays a decisive role in the panel resistance.In this paper,a full-scale cold-formed thin-walled steel straw brick wall was tested under low cycle cyclic loading.It can be seen from the test that the new composite wall has good integrity and obvious damage phenomenon under the action of horizontal external force.According to the test hysteresis curve,skeleton curve and stiffness curve,the plastic characteristics of the wall are outstanding,which can meet the needs of bearing capacity and deformation in engineering application.The ABAQUS nonlinear finite element analysis of the cold-formed thin-walled steel straw brick wall shows that the frame and the cement mortar layer at the frame side have a great influence on the lateral bearing capacity of the wall,and the improvement of steel strength and cement mortar strength can significantly improve the lateral bearing capacity of the wall,but the enhancement effect is not obvious when the strength level is increased to a certain extent.Straw brick and wood keel have little influence on the lateral bearing capacity of the wall,and their contribution to the bearing capacity may not be considered in the design,but the structure of the joint needs to be handled well to meet the integrity requirements.