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| Optimization design for src frame structure based on the fuzzy reliability |
| ZHENG Shan-suo，WANG Xiao-fei，HE Wei，WANG Fan |
| School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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Abstract Based on ‘‘investment - benefit’’ rule, optimization mathematical model of SRC frame structure is established. Optimization objectives include the initial cost minimization and the structural failure loss minimization, and the weighed coefficient is used to adjust the importance of the both. In order to obtain the structural loss expectation, firstly, the failure probability of structures is calculated. In order to obtain more close to the actual failure probability, fuzzy reliability analysis of SRC frame structure is performed. The main contents of fuzzy reliability analysis include: determining the seismic performance level quantification value of SRC frame structure; establishing structural fuzzy function; Monte Carlo method is proposed considering the fuzziness. Adjusts SRC frame structure optimization process to a two level iteration process, in which, the outer layer for optimization design, the inner layer for the structural reliability analysis. Considering that design variables and constraint conditions is too much and the nonlinear degree of constraint conditions and objective function is higher, phase-in optimization calculation method for SRC frame structure is put forward. Finally, the optimization design of a one-bay-three-story SRC frame is implemented, optimization results show that the optimization method proposed in the paper can obtain ideal and reliable design results.
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Received: 10 March 2014
Published: 25 May 2015
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