Optimization And Design Of Lightweight Steel Structure Filled With The Concentrically Brace

The steel structure has been widely used in recent years, as the special property ofsteel structure and the adjustment of policy. Pure steel frame structure can providesufficient indoor space, but it does not apply in high intensity area because its lateralstiffness is small. Steel concentrically braced frame system is a common used duallateral resistant system in multi-story frames. Its characteristics, such as green,economic, effective, makes it widely used in high-rise buildings. But if designedimproperly, it will cause collapse and other serious consequences. In the design of steelconcentrically braced frame system, the stiffness of the framework needs to be adjustedfor the central brace to play a better role as a second line of defense.This paper bases on the distribution of shear rate, using the PKPM to modeling andanalyze. A six-layer light steel structure housing is used to be the model to achieve theoptimal shear distribution rate through optimization design. Add central braces indifferent location according the principle of layout of residential structure, and theseismic properties of frame. There are four schemes: A, B, C, D. The shear rate of thesefour schemes under the earthquake is analyzed through PKPM. The interlayerdisplacement, shear force, story drift ratios, seismic force are contrasted to receive theoptimal scheme.Through the analysis these can be indicated:(1) Under the earthquake action, the central braces can contribute largely to theaseismatic property of the structure. The constructional form is relatively simple, thepattern of force transmit is definite, the connection between column and beam isconvenient, the form of the structure is easy to design and construct, the economicbenefit is good, so it is more appropriate to be used in multi-storey steel structureresidential buildings. It is conducive to the promotion and application of multi-layerlight steel residential building structure system;(2) Through the response of structures under earthquake in the role of each modethis paper put forward: according to the current the code for seismic design of buildings(GB50011-2010), The framework which designed bearing at least25%shear of thestructure can satisfy the three level of requirements for seismic resistance;(3) Through the analysis of the shear rate of the structure under the earthquake this paper suggests: The regulation of the framework seismic shear distribution ofconcentrically braced steel frame can be according to the principle that each layerframework can at least take25%of the layer shear, rather than25%of the totalshearing force at the bottom.