Finite Element Analysis Of Lateral Force Resistance Of Light Steel Frame-Aerated Concrete Block Composite Wall

In recent years the emergence of lattice steel is a new light gauge steel system, with its light weight, highly industrialized, short construction period, less wet operations, shock resistance, low cost, environmental protection recyclable, etc., and more and more well known, and was extended to the low, multi-residential buildings. This structure wall system still closely spaced columns and lattice sheet square column composed of reinforced concrete structure with respect to non-compacting shortcomings, and thin wall prone to partial or overall bukling, thereby reducing their ultimate bearing capacity.To solve two problems of light gauge steel compsite wall proposed above, this paper proposes a new type of light steel frame autoclaved aerated concrete block compsite wall composed of the light gauge steel frame composed of square columns, autoclaved aerated concrete masonry and foam concrete.Firstly this paper introduces the composition, practice and features of the light steel frame autoclaved aerated concrete block compsite wall briefly.In order to know the mechanical properties of different materials, before the commencement of theoretical research, this paper tests the Elastic modulus and ultimate compressive strength of autoclaved aerated concrete blocks, foam concrete, mortar and steel, we get the tension and compression stress-strain relationship of four materials.The finite element models of light gauge steel frame and the compsite wall,were established with ABAQUS finite element software in this paper, in which the Lattice frame steel pipes and connectors were simplified using beam element. To simplify the calculation, we take out the half model in the thickness direction of the composite wall to analysis. When establish the composite wall modeling, the steel frame and the connector were simplified using beam element, and the steel frame was embedded in the concrete modeling using 2D solid element. Some autoclaved concrete blocks have been simplified to a 2D solid element, which are connected by mortar using cohesive elemet. The foam concrete and autoclaved concrete blocks were merged together.This paper analyze the lateral stiffness and horizontal bearing capacity of the compsite wall under Horizontal load, based on the light steel frame autoclaved aerated concrete masonry composite wall calculate model, and compared with the test results, to verify the reasonableness of theoretical modeling approach.On the basis of a compsite wall finite element model, this paper analyze several factors that influence bearing capacity and lateral stiffness of the compsite wall, including autoclaved aerated concrete blocks, mortar and foam concrete strength and the thickness of steel framework. The results showed that: the ultimate bearing capacity and lateral stiffness of light steel frame- block composite wall significantly improved compared to the light steel frame; improving the strength of autoclaved aerated concrete blocks, foam concrete and mortar can significantly improve lateral capacity of the composite wall, but it is not obvious to improve the lateral stiffness of the wall; increasing the thickness of the light steel frame can significantly improve lateral stiffness of the composite wall, but it is not obvious to increase the lateral capacity of the composite wall.In this paper, light steel frame autoclaved concrete masonry compsite wall finite element was analyzed, which provide a reference for further study of this compsite wall and a theoretical basis for engineering applications.