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Structural Engineering and Mechanics Volume 56, Number 4, November25 2015 , pages 549-567 DOI: https://doi.org/10.12989/sem.2015.56.4.549 |
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A Gaussian process-based response surface method for structural reliability analysis |
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Guoshao Su, Jianqing Jiang, Bo Yu and Yilong Xiao
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| Abstract | ||
| A first-order moment method (FORM) reliability analysis is commonly used for structural stability analysis. It requires the values and partial derivatives of the performance to function with respect to the random variables for the design. These calculations can be cumbersome when the performance functions are implicit. A Gaussian process (GP)-based response surface is adopted in this study to approximate the limit state function. By using a trained GP model, a large number of values and partial derivatives of the performance functions can be obtained for conventional reliability analysis with a FORM, thereby reducing the number of stability analysis calculations. This dynamic renewed knowledge source can provide great assistance in improving the predictive capacity of GP during the iterative process, particularly from the view of machine learning. An iterative algorithm is therefore proposed to improve the precision of GP approximation around the design point by constantly adding new design points to the initial training set. Examples are provided to illustrate the GP-based response surface for both structural and non-structural reliability analyses. The results show that the proposed approach is applicable to structural reliability analyses that involve implicit performance functions and structural response evaluations that entail time consuming finite element analyses. | ||
| Key Words | ||
| first-order moment method; structural reliability; response surface method; Gaussian process | ||
| Address | ||
| Guoshao Su, Jianqing Jiang, Bo Yu and Yilong Xiao: School of Civil and Architecture Engineering, Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China | ||