Analyzed On The Composite Walls Of The Cold-formed Thin-walled Steel Residential Buildings Under Bearing Vertical Load

Comparing with the overseas advanced level, our country is later in the research and appli-cation about light steel structure, and is still in the research and the experiment site stage about the cold-formed thin-walled steel residential buildings.For the ratio width-thickness of cold--formed thin-walled steel is bigger, element is easy to happen local buckling or overall buckling, when the structure bears the vertical load. Once stability loses, the thin-walled steel structure collapses immediately, the structure security is harmed directly.Through the research on the composite wall C-shaped stud of the cold-formed thin-walled steel residential buildings under bearing vertical load, we hoped that the thesis can accelerate the development of the steel residential buildings in the domestic.1. introduce specifically the characteristics of the cold-formed thin-walled steel residential buildings, the domestic and international application of the steel residential buildings at present, and the domestic and international research status of the cold-steel thin-walled steel residential buildings system under the vertical force.2. Introduce specifically the cold-formed thin-walled steel residential buildings vertical stress system, the cold-formed thin-walled steel plate buckling theory and effective width under bearing vertical load, and, effect of bearing capacity taking into account plate assembly effect of rectangular thin-walled member using the existing theory.3. From the simple root stud, this thesis discusses the different buckling load and buckling failure mode of the simple root stud in the cold-formed thin-walled steel residential buildings under the vertical force; After, writer has analyzed the changes rule of the stud buckling stress, buckling failure mode under different studs calculated length, the section size, and the critical calculated length,some relationships are gained.4. Analyzed the rule of critical buckling stress and failure mode under different section, when the sheathing-bracing wall stud bears the vertical load, acquire the laws that are relevant to the sheathing effect by contrasting and calculating the capacity of studs between sheathing--bracing and non-sheathing-bracing.5.With the use of finite element analysis, set up a finite element ANS YS model about the composite wall of sheathing-bracing and non-sheathing-bracing; determine the appropriate model boundary constraint condition refer to the correlation testing literature; discuss effect of stud calculated length taking into account track; analyzed the change rule of the composite wall's critical buckling stress under different wall type, stud spacing.Finally, on the basis of the above research, sum up the main conclusions and propose the further improved work in this thesis according to the domestic and international research direction.