Research On Lateral Performance Of Foam Concrete Light Steel Keel Composite Wall

A new type of wall made of light gauge steel skeleton,fiber cement pressure plate and foam concrete as core material as the load-bearing components of a low-rise light steel residence.The residence not only has the traditional low-light residential buildings with a high degree of standardization,industrial production,energy saving and environmental protection,but also has excellent thermal insulation,sound insulation,fire performance.Based on numerous literatures,this paper mainly presents detailed results on the lateral performance of foam concrete light steel keel composite wall by test and deriving the theoretical formula.In this paper,the scientific calculation method of the lateral performance of the light gauge steel foam concrete composite wall is given.Hope to provide the necessary technical support and theoretical basis for the construction of this house.10 walls under monotonic and cyclic load are tested in this paper.The trial devices,test method and full test course as well as the analysis of test data are introduced in detail in this paper.It is shown that the main failure modes of the test specimens are local fragmentation of fiber cement pressure plates or pulling-out of self-drilling screws resulting in the failure of fiber cement pressure plates.Based on the test data,the shear performance indexes of wall panels,such as yield load,maximum load,failure load and ductility factor,were calculated.Mainly analysis the loading method of horizontal load,vertical load,filling effect of foam concrete and the impact of wall structures on the lateral performance of the composite wall.Test results show that wall's lateral behavior under monotonic load is higher than that under low cyclic repeated horizontal loading;vertical load and foam concrete can promote the wall' s lateral performance obviously;wall columns with double keel column truss structure can enhance the lateral behavior of the combined wall;the reduction of the self-tapping screw spacing can increase the shear resistance of the wall,but it will reduce the ductility of the wall simultaneously;with the increase of the spacing of the keel column,the wall lateral performance will reduce.The formulas for calculating lateral stiffness of such composite wall under elastic stage are proposed by using the method of equivalent brace.The results calculated by the formulas correspond to the test results,but the formulas cannot be used to calculate the lateral stiffness of the wall under the plastic stage.It is supposed that we regard the destruction of the first self-tapping screw as the boundary condition,so as to deduce the formula for calculating shear resistance of composite wall.However,the result calculated by the formula is different from the test result,because the composite wall is almost in the state of yield when the first self-tapping screw is destroyed,and the effect of fulling foam concrete is missed during deducing the formula.The revised formula is fit for calculating shear resistance of composite wall which is under the elastic stage.In addition,this paper provides an example that checking the seismic performance of the foam concrete light steel keel composite wall in the actual project.