OPTIMIZATION DESIGN FOR STEEL REINFORCED CONCRETE FRAME BEAM BASED ON ANSYS FINITE ELEMENT THEORY

Based on experimental study of bond-slip behaviours between steel and concrete, a nonlinear finite element optimization design method of steel reinforced concrete (SRC) beams is proposed by ANSYS. The design variables include the layout dimensions of SRC frame beams, structural member sections, the strengths of concrete and steel, the dimensions of shaped steel; the objective function is the cost of the entire materials applied to construct a SRC frame beam; the constraint conditions are main requirements stated in Chinese code for design of SRC structures, including basic design rules, reasonable calculating theories, indispensable constructions, and some mature conclusions confirmed by experimental studies on the calculating methods of SRC structures based on the bond-slip theory between shaped steel and concrete encasement. With the failure experiments of some SRC beams, the mechanical behaviours of SRC beams during every stage are further learnt. Reasonably determine the constitutive relation of shaped steel and concrete which are used to the nonlinear analysis by ANSYS, and nonlinear analysis and system optimization are jointed together, iterated and converged mutually in nonlinear finite element optimization program, which reduces the times of the iteration. All these may contribute to the analysis and design effectively, improvement of SRC frame structures, and provide a way for optimization design of other steel-concrete composite structures.