Experimental Study And Analysis Of Axial Bearing Capacity Of Lattice Channel-Steel Keel Wall-Column

In recent years,with the economic development and the accelerated process of housing industrialization,light-gauge steel structure system has been widely used in China due to its good performance,short construction period,environmentally friendly material and other characteristics.One of the important components of this structural system is light-gauge steel composite wall.In this paper,the study object is the composite wall column which consists of the lattice channel-steel column(LCSC)sheathed in OSB-board.The connection between the channel-steel and the U-type connector is self-tapping screw,as well as the connection between the column and the OSB-board.In this paper,the axial compression tests and the finite element analysis of LCSC and the composite wall column were carried out to obtain the axial bearing capacity,the load-displacement curves and the load-strain curves of each specimen.Through the mutual verification of the test and the finite element,the correctness and rationality of the finite element modeling method have been proved.Considering the position of the OSB-board joint,the thickness of the OSB-board,the interval of the self-tapping screws connecting the OSB-board and LCSCs,the spacing of LCSCs and the eccentricity of the load,the finite element models were built to analyze the affection of these five factors on the bearing capacity of the composite wall column to obtain their relationship.It can be found that the bearing capacity of the composite wall column is linearly related to the thickness of the channel-steel through the test.The whole process includes very obvious elastic and plastic stages,and the composite wall columns have good ductility.The OSB-board can improve the integrity of the composite wall column because of the stressed skin diaphragm and thus the mechanical performance of the composite wall column can be improved.The smaller the thickness of the channel,the more obvious the effect of the OSB-board on the bearing capacity of the specimen,which requires special attention in practical application.Due to the installation and loading error,the bearing capacity of the composite wall has a certain degree of chance comparing to LCSC so we need to pay special attention to precision during the test.Steel mechanical properties are very good,and we need to use the actual material properties of steel material data in the finite element model to make the result of finite element simulation more reasonable.The initial bending and the initial eccentricity have a great influence on the axial bearing capacity of the component.The strength of the connection between the OSB-board and the LCSC has a great influence on the bearing capacity of the composite wall column.In the finite element model,it is necessary to simulate the corresponding connection reasonably so that the model is closer to the actual situation and it has a great influence on the load-displacement curves.By analyzing the influence of various factors on the bearing capacity of the composite wall column,it can be found that reducing the distance between the OSBboard joint and the end of the wall column,reducing the interval of the self-tapping screws connecting the OSB-board and LCSCs,increasing the spacing between the LCSCs and increasing the thickness of OSB-board will increase the bearing capacity of the composite wall column,but the change is not large.The results of this paper show that the bearing capacity of composite wall is high and the deformation performance is good,which can overcome the shortcomings of the traditional structure and has good application prospect.This paper can provide a reference for further research and application of this kind of structural system.