Research On Stability Of Cold-formed Thin-walled Steel

Cold-formed thin-walled steel structure housing is one kind "the festival, the energy conservation, saves water, the nodal wood" "the green" the housing system, its heat preservation, the heat insulation, the sound insulation and comfortableness surpass the traditional housing, is at the rapid development phase in the international domain。Develops this kind of new housing system, not only conforms to the national resources policy, the environmental protection policy and the sustainable developmental strategy, moreover to promotes our country to conserve energy the housing technology the innovation ability, promotes the housing industry advancement, to improve the people to live the level to have the vital significance。Because the domestic enterprise mostly introduce overseas technology and the mechanical device, the domestic existing standard can not satisfy the design and the construction of this kind of new housing system, therefore the analysis to this kind of structure is especially important.Here introduced the cold-formed thin-wall section is Wuhan Metscs Corporation produces, the section is a trough, highly 90mm, width 40mm, wall thickness 0.55mm, submits the load to reach as high as 550MPa, Carries on the stable analysis and the limit supporting capacity research to its composition truss. This article mainly carries on the discussion from following several aspects:1) According to actual engineering structure situation establishment three dimensional finite element model. All the truss components are based on the above-mentioned section, at both ends of the lower chord member of a truss hinged fixed, the top chord member of the coupling connecting nodes, and the spacing of the constraints imposed Z.2) On web member and lower chord member becomes the angle size, has established 4 models, analysis linearity flexion, geometric nonlinear flexion of perfect system, geometric nonlinear flexion of deficiency system and elastic-plasticity and two-ply nonlinear flexion of deficiency system to arch truss structure to get the full process curve of load-displacement and make a compare to the structure by use of the ANSYS finite element software on basis of the stability theory.3) The analysis result can be obviously get that material nonlinear has a very obvious influence to the stability of the structure; Material nonlinear and geometric nonlinear are taked into account as well makes a better understanding of the structure stability.At last, some conclusions are maked basing of the above reachering and some of them are very helpful for the future engineer design.