Multi-storey Steel Structure Design Method Based On Optimum Lateral Stiffness Distribution

Seismic design should full focus on structural performance,security,economy and so on. But traditional seismic design usually biased in favor of conservative and security, material properties will not been fully exploited. The purpose of this study is in ensuring the seismic performance of the premise, reduce the cost of construction, Improve the quality and level of design method.In order to achieve the best seismic performance of structures,this article studies the sections'distribution of structural members to avoid the concentration of structural damage by arranging structural stiffness optimal from the perspective of energy. Research in this regard at home and abroad is still very small at present.Seismic performance analysis and design based on the earthquake response of the structures. The time history analysis method has become an important method for seismic analysis of important buildings at present. It is showed in Code for seismic design of buildings that the time history analysis method is used for research on structural damage mechanism under the earthquake and to improve seismic design method. In addtion, pushover analysis procedure and energy method proposed by Akiyama are also effective methods to obtain the necessary earthquake response of the structures.Based on above background, this paper uses the time history analysis method and SAP2000 to study optimum lateral stiffness distribution and optimum moment of inertia ratio of steel structures, at the same time, a new design method is proposed. Besides, pushover analysis procedure and energy method are used to validate the goodness of the new design method.Firstly, multi-storey steel structures are designed. In order to make the cumulative plastic deformation ratio of each storey equivalent under rare earthquake, time history analysis method is used to study the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures. At the same time, formulas of the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures distribution are proposed.Secondly, different kinds of lateral stiffness distribution models are designed to vertify the rightness of the optimum distribution of lateral stiffness and the optimum moment of inertia. Based on the optimum distribution of stiffness and the optimum moment of inertia, a new design method of multi-storey steel structures based on the optimum lateral stiffness distribution is proposed.At last, In order to validate the goodness of the new design method, 12-storey models are designed, pushover analysis procedure and energy method are used to study the earthquake response of the structures.