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| System reliability assessment of long-span cable-stayed bridges using an updating support vector algorithm |
| Received:February 17, 2014 Revised:May 03, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201502003 |
| KeyWord:bridge engineering system reliability cable-stayed bridge support vector machine failure sequence |
| Author | Institution |
| 刘扬 |
长沙理工大学 桥梁结构安全控制湖南省工程实验室, 长沙 |
| 鲁乃唯 |
长沙理工大学 桥梁结构安全控制湖南省工程实验室, 长沙 |
| 殷新锋 |
长沙理工大学 桥梁结构安全控制湖南省工程实验室, 长沙 |
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| Abstract: |
| A new system reliability assessment method is proposed based on updating support vector method, considering the characteristic of cable-stayed bridges with explicit performance functions and multiple failure modes.The traditional Support Vector Machine (SVM) is developed and applied to system reliability analysis of cable-stayed bridges.There are four main steps in this algorithm:firstly, the main failure sequences should be rectified according to the sensitivity analysis of components;secondly, Least Squares Support Vector Machine (LS-SVM) is used to approximate the structural responses, and then reliability indices of components are obtained using Monte-Carlo simulation method.Thirdly, the support vectors in LS-SVM model are updated on the basis of updated finite element models, and then the conditional reliability indices of the rest components is calculated based on the updated support vector model;finally, the failure tree of structural system and series parallel method are used to estimate the system reliability index.The numerical analysis of a concrete cable-stayed bridge with 420m span has shown the effectiveness and applicability of the proposed algorithm.At the same time, the main failure sequences and the main failure components of the concrete bridge are given. |
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