Failure modes-based three-level aseismic optimal design for a SRC frame-RC core wall hybrid structure

Multi-objective design of a SRC frame-RC core wall hybrid structure was taken as an example, minimizing its project cost and damage was taken as optimization objectives by introducing a damage function. According to the three-level aseismic fortification criterion, and the mechanical characteristics of the structure, a three-level aseismic fortification criterion optimization design method was presented. The optimization of the cross-section sizes of the structural components and concrete volume was actualized by assuming that only concrete works under a minor earthquake. The optimization of steel volume was performed to meet the requirement of the minimum displacement difference between two adjacent storeies under a moderate earthquake, while the frame and shear wall were in a collaborative working state. The optimization of steel volume was implemented further to meet the requirement of the minimum structural damage under a severe earthquake, while the structure was in a plastic state and the shear wall was out of work. So, a multi-objective optimization problem was converted into several single-objective optimization problems. Taking various constraints into consideration, a failure modes-based three-level aseismic optimal design of a SRC frame-RC core wall hybrid structure was actualized by using the combination of the genetic algorithm and the optimization criterion, i. e., the OC-GA algorithm. A numerical example of a 24-storey SRC frame-RC core wall structure was analyzed to verify the rationality of the proposed method.