| Light gauge steel construction whose structural framing is constitutive of cold-formed steel members has been on a rapidly increasing sacle and has been used for low residential construction widely in the world since the construction has a series of prominent advantages such as light weight, high strength and stiffness, energy saving, environmental protection, ease of prefabrication and mass production, fast and easy erection and installation and so on, but its research and application has just begun in our country. The prescriptive method and design manuals for the construction of one- and two-family residential dwellings using cold-formed steel framing have issued in North America and Canada, however, all methodss are based on experience and application, but no simplified analytical method is put forward.To promote the application and development of light gauge steel framed residential dwellings in our country, the research on structural performance of light gauge steel framing should be enhanced and the structural system according with architectural system should be developed. Concerning the tests, analyses, design and calculation of performances for light gauge steel framing, this paper focuses on following items:(1) The calculation of light gauge steel framed compound bearing walls (LGSFCBW) in compression and bending. Based on North American specification and commentary for the design of cold-formed steel structural members, which was published by the American Iron and Steel Institute, the detailed design requirements of wall stud assemblies are given considering the structural contribution of the attached sheathings and shear diaphragm is discussed briefly. Then the calculational theoretic and method for sheathing braced wall stud assemblies complying with national code is brought up in compression and bending. Finally, the calculation is simplified so as to use directly. The effect of the attached sheathings is taken into account when the LGSFCBW in compression and bending is computed. A gap is supplied on native wall stud design code and the calculational method can be refered by designers and researchers.(2) The study on lateral resistance of LGSFCBW. Because the lateral performance of the LGSFCBW is quite complex and dependent of many factors, theoretic calculation is unpractical and study is on the basis of test all over the world. Firstly, the possible fracture modes and reasons are assessed and the influences of all kinds of components to the lateral performance are summarized so that the intruduction and application of light gauge steel constructions is established. Secondly, the present situation of the research on the seismic behaviour of LGSFCBW from three aspects including test models, test programs and setups. and test results is briefly expounded. Furthermore, the fracture modes and the basic dynamic properties of such structures are identified. Some suggestions are brought forward. Thirdly, to improve the application of light gauge steel structure in our country, some experimentations ofInstitute of New-Style Steel Structure which adopting native productions are induced nally, three-dimensional finite element model is presented. Compared with the tests, mumerical results are verified much accurate and efficient, therefore a reliable way is provided to utilize the computational technique adequately to reduce the tests and to utilize the experimental results adequately to improve design quality,(3) Study on floor system. Not only adequate strength, stiffness and integer stabilization must be provided, but also insulation, fire and acoustics must be satified. Referring to the forms of floor solution abroad, Autoclaved Lightweight Concrete (ALC) floor used in low buildings and precast ALC composite slab used in middle buildings are put forward. Furthermore, the calculational methods and corresponding analyses are discussed.(4) Research on design method of low light gauge steel constructions in North America. A concise recommendation adopting Chinese term... |
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