Optimization Design Research Of SRC Frame Structure

The SRC frame structure is a new type structure, which is made by incorporating the section steel into the steel reinforced concrete with integrity and working together. The mechanical performance is obvious better than a simply superposition of RC structure and steel structure. Compared with the steel structure, due to the restriction of wrapped concrete, SRC structure can effectively prevent the local buckling of steel members and significantly improving the steel structure of the overall stiffness and give full play to the strength of steel. In addition, the protection of the outsourcing concrete also increases the durability and the fire resistance. Compared with the RC structure, the SRC frame structure has a good deformation capacity of steel, which greatly improves the ductility of the member. Especially with the full web type(H type steel, I-section steel, channel steel, etc.), steel SRC member can significantly improve the brittle nature of shear failure and the seismic performance of the structure.Static analysis and modal analysis for a 12 layers SRC framework office building in Licheng high school are finished by the finite element analysis software ANSYS under the constant load, live load and wind load condition Due to the problems existing in the actual engineering structure are very complicated, the influence of a variety of factors and even uncertain factors of the whole framework to that parametric modeling and optimal design is difficult to achieve. For convenience, select the bottom and the fourth axis specimens from the whole frame structure with representative frame member to study base on the separation of parametric modeling. Considering the nonlinear characteristics of steel and concrete and carried out the nonlinear stress analysis. Then mature research conclusions of the SRC structure and defined in the current design specification and design theory of design basic requirements, the key points of calculation and structural measures as constraint conditions. Objective function is base on frame member economic cost. Due to the emergence of local optimal solution, an optimal algorithm is not easy to determine the reliability of the optimization results, using ANSYS optimization module provides the "zero-order optimal algorithm" and "first-order optimal algorithm” to conduct optimization analysis respectively of SRC frame structures with the section size of steel, longitudinal reinforcement, concrete and the distance form steel centre to the tensile edge as the design variables. Finally, cost optimization efficiency is roughly around 10%, it can be concluded that, the conclusion of optimize efficiency is significant through the economic benefits comparison between best optimized sequence and the original case. Structure optimization design plays an important role in the promotion of future engineering.