Research On Shear Behaviors Of High-Strength Ultra-Thin-Wall Steel Wall Frames

The cold-formed thin-wall steel structural system behaves a series of advantages for the low-rise residential buildings, including light weight, material saving, short design and construction duration, energy saving, environmental protection, easy industrialized production and etc. This structural system is widely used abroad many years but used in China in recent years. Domestic enterprises are mostly used abroad sets of technologies, skill and building materials production lines. Since there are great differences between abroad and China in the design and its application, so that the research of shear behavior on this structure system is very necessary.In this paper, low-rise cold-formed thin-wall steel structural system of Met Frame Construction Technology CO. LTD for engineering background, the wall frame is taken as an object to research of the Anti-force behavior and ultimate bearing capacity. The mainly discusses are followed:(1)The numerical analysis of the high-strength ultra-thin-wall steel independent-wall frame models is performed considering material and geometry nonlinear problems simultaneously. As a result, modal Analysis, failure modes, ultimate bearing capacity of the independent -wall frame are obtained and analyzed.(2)A parametric analysis by FEM is carried out. The influences of different column spaces, different height-width ratios of wall frames and different member connection pitch upon the shear capacity of wall frame are discussed. Furthermore, Compared the ultimate buckling load with original structure, the analysis of the impact of various factors. The results show that: With the column spaces, wall-height, the distance between the member connection pitch to increase, the independent structure of the wall-shear strength reduced. (3)Considering the needs of project, the study by independent-wall frame to wall-wall frame. Comparative Study of stability, failure modes, ultimate buckling load with two structure system .Results from the analysis shows that with the increase of wall frame's number, the shear capacity of wall frame is significantly increased, and extent of the increase of shear capacity is greatly, The results fully reflects the structural integrity of the wall-effects.(4)To explode and understand the main design method,design assumptions,structural conditions,principle of finite element model and failure modes of "stressed skin diaphragm", and research influence on shear capacity of wall frame.At last, all researches in this article are concluded, some conclusions are very helpful for the future design and some questions need to be solved in future are pointed out.