Optimization design for SRC frame structures based on fuzzy reliability

Based on “investment-benefit” rule, the optimization mathematical model of SRC frame structures was established. Optimization objectives included the initial cost minimization and the structural failure loss minimization, and the weighed coefficient was used to adjust the importance of the both. In order to obtain the structural loss expectation, firstly, the failure probability of structures was calculated. In order to obtain the failure probability more close to reality, the fuzzy reliability analysis of SRC frame structures was performed. The main contents of fuzzy reliability analysis included determining the aseismic performance level quantification value of SRC frame structures, establishing structural fuzzy function, and presenting Monte Carlo method considering the fuzziness. The SRC frame structure optimization process was adjusted to a two-level iteration process with the outer layer for optimization design and the inner layer for the structural reliability analysis. Aiming at too many design variables and constraint conditions and the higher nonlinear level of constraint conditions and objective function, the phase-in optimization calculation method for SRC frame structures was put forward. Finally, the optimization design of a one-bay-three-story SRC frame is implemented. The optimization results showed that the optimization method proposed here can obtain ideal and reliable design results. ©, 2015, Chinese Vibration Engineering Society. All right reserved.