基于不确定性推理的大跨度斜拉桥综合评估研究

Comprehensive Assessment of Long-span Cable-stayed Bridge Based on Uncertainty Inference

摘要:

随着国内桥梁建造水平的飞速提升，大跨度桥梁技术状态评估越来越受到重视的同时，仍存在较多问题和不足。本文以某斜拉桥为研究背景，采用不确定推理中的多级模糊综合方法和D-S证据理论，对钢箱梁斜拉桥开展状态评估，并与直接加权平均方法的结果进行比较。研究表明，不确定性推理方法可以较好地应用于大跨度斜拉桥的技术状态评估；D-S证据理论方法能体现子指标之间的差异性，有利于做出更加合理的养护决策。

Abstract:

With the rapid improvement of the bridge construction level in China, the technical condition assessment of long-span bridges is getting more and more attention, but also there are still more problems and deficiencies. Taking a cable-stayed bridge as the research background, the multi-level fuzzy synthesis method in uncertainty inference and D-S evidence theory are used to carry out the condition assessment on the steel box beam cable-stayed bridge, and the results are compared with those of the direct weighted average method. The study shows that the uncertainty inference method can be better applied to the technical condition assessment of long-span cable-stayed bridges. The D-S evidence theory method can reflect the difference among sub-indexes, which is conducive to making more reasonable maintenance decisions.