Study On Shear Performance Of Light Gauge Steel-foam Concrete Composite Lightweight Wall

Green building is the current trend of the development of the construction industry in the world.To develop green building is a major measure to promote energy conservation and emission reduction,protect the environment and promote the construction of ecological civilization.The new structure of the wall-Light steel keel foam concrete composite lightweight wall studied in this paper has good machining property and is easy to assemble with light weight and high strength,which is suitable for building modular,standardized,factory,assembly and information and in line with five development concepts of innovation,coordination,green,open and shared.The shear resistance of light steel keel foam concrete composite lightweight wall is affected by many factors,making its theoretical calculation very difficult.At home and abroad the study of it relies mainly on experimental methods,which are neither economical nor conducive to the design and application and the norm making.According to the current research status,two kinds of loading methods,horizontal monotonic loading and low cyclic reciprocating loading were adopted in this paper and the shear performance test of full size specimens of a keel wall without foam concrete filled,two composite walls of light steel keel and foam concrete and a composite wall with a opening size of 1.2m ×1.6m was cast.According to the process of the wall stress and the damage characteristics,the performance indexes of the wall such as yielding load,maximum load and failure load were determined.The factors affecting the shear resistance of the wall were analyzed and compared with the existing light steel keel wall with double-sided sheathings.The shear resistance of a keel wall without foam concrete filled was analyzed by using ABAQUS finite element software compared with the test results.And the effect of the spacing of strut and the size of studs on the shear performance of the keel wall was studied.Meanwhile,According to the change of the composite lightweight wall during the loading process,the simplified analysis of the elastic phase,the elasto-plastic phase and the failure phase of the wall were deduced to derive the calculation formula of the lateral stiffness of the wall.Experimental results showed that pouring foam concrete in the keel zone changed the lateral resistance of the keel and thus enhanced the bearing capacity and the lateral stiffness of the light steel keel wall.The bearing capacity of the wall under low cycle loading was lower than that under monotone loading.The opening reduced the shear capacity of the wall.By simulating the monotonous horizontal loading of the keel wall without foamconcrete filled,it was concluded that the spacing of strut and the size of studs had an effect on the shear performance of the keel.Combined with the test phenomenon,the elastic stage wall was simplified as a composite elastic plate model,the elasto-plastic stage was simplified as a rigid frame compression bar model,and the destruction stage was simplified as a beam hinge frame model,and the calculation formula of the lateral stiffness of the wall stage was derived.