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 reise 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 we 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 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.