TIME-DEPENDENT ROBUST RELIABILITY OPTIMIZATION OF STRUCTURE BASED ON GENETIC INTERVAL AFFINE RESPONSE SURFACE

GUAN Yi; SHENG GuoJun

doi:10.16579/j.issn.1001.9669.2024.03.016

Abstract：In order to improve the time dependent robust reliability performance of structure and give consideration to the description accuracy of interval variables,a time dependent robust reliability optimization of structure based on genetic interval affine response surface method was proposed.Firstly,the performance response of structure according to the structural performance analysis method was obtained,and uncertainties of the structure were extracted.Secondly,the parametric analysis model of the structure was established,and design of experiment was carried out.The process of design of experiment was divided into two parts which were design variable database and structural performance response database.Combined with interval affine theory,the initial interval affine response surface was established.On the basis of sample boundary and structural performance analysis results of each variable in the design variable database,the genetic algorithm and criteria for error minimization were used to optimize the initial interval affine response surface.The structural performance response database was used to verify the effectiveness of new interval affine response surface.Finally,combined with structural performance degradation behaviour and robust reliability optimization method,the time dependent robust reliability optimization model for structure was established and structural optimization design was carried out.The rationality of the proposed method was verified by an engineering example.The analysis results show that genetic interval affine response surface can more reasonably reflect the fluctuation range of structural response,and the proposed optimization method can effectively improve the level of structural robust reliability.