| By the increasing of steel productive, steel has been more and more used in civil-engineering structure. Right now, light steel has rapidly developed, its prospect is favored for its certain advantages, and this kind of structure has been greatly used in many low-buildings.In this paper, we will study a new type of light-steel structure, this new type of light-gauge steel wall is composed of two light-gauge steel tubes and the tubes are connected by special standard V clips. The steel wall studs are sheathed by wallboards to act as vertical load carrying members in the light steel structural buildings. The skeleton of the light-gauge Steel wall is the small truss which is composed of two cold-formed thin-walled square tubes or rectangular tubes, and the two square tubes are connected with special standard V clips by the self tapping screws. As usual, the material of the wall can be steel, gypsum or OSB-board. Furthermore, in order to increase the bearing capacity of the system, cross-tensile steel can be set up on both sides of the wall through the self tapping screw to connect to the square tubes.In the paper, both theoretical analysis and finite element software SAP2000 are used to analysis the buckling modes, buckling capacity and the ultimate bearing load of the wall studs with dissimilar sheathing diaphragm on two sides. And then judging the reasonbale of the results by comparing these two sets of solutions, finally the rationalization for engineering design methods are recommended.In the paper, the main contents are listed as follows:1. Through analysis, identify the possible buckling modes of the systems under the boundary conditions of hinged at both ends.2. According to the energy law, the total potential energy equation systems is established and then through the principle of stationary potential energy, caculate all kinds of linear buckling load.3. Considering about the initial defect, calculate the stability factor, then calculate the nonlinear buckling load (also named ultimate load)4. By using the finite element software SAP2000, establish the finite element model of systems, get different forms of buckling modes and buckling loads.5. Contrast the results calculated by the theoretical analysis and finite element software SAP2000 to verify the reliability of the results.6. Comparison the load capacity of the small truss column with or without the supported-wall, analyze the effect of the supported-wall. These key points are concluded from the paper, listed as follows:1. There are three possible buckling modes of Wall Studs with Dissimilar Sheathing Diaphragm on Two Sides under the boundary conditions of hinged at both ends.a. The square tube connected to the weak sheathing diaphragm buckles in the wall plane.b. The whole system buckles outside the wall plane.c. Part of the square tube buckles.2. For the buckling mode of in wall plane, the diaphgram bracing can significantly improve the buckling load of the system. However, due to the buckling mode of outside wall plane, the diaphragm bracing performed not as well as the previous case, the diaphragm bracing hardly improve the buckling load of the system. The statics show that the height of the system greatly affect the buckling load of the outside wall plane.3. The results calculated through the theoretical analysis are quite close to solutions of the finite element software SAP2000. So the results are reliable and reasonable.4. For the new type of structure system, the buckling load out of wall plane is much greater than that of in plane because of the certain factors such as the height of the system or the section of the small truss column. So the ultimate loading capacity is calculated according to the in plane buckling load.5. The method of the caculation of the structure system is given in this paper. |
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