三标度模糊层次分析法在桥梁安全评估中的应用

摘要

In order to have an objective and systematical evaluation of bridge safety and keep the bridge working well , a comprehensive integrated assessment method based on three-scale analytic hierarchy process and fuzzy eval-uation model was presented .On the basis of the method , the application research of bridge safety assessment was principally illustrated as follows .Firstly, the assessment indexes of bridge safety were determined through the anal-ysis of various factors that had effects on safety operation of bridges by analytic hierarchy process .The assessment index system for bridge safety was established , which was classified into target layer , criterion layer and index lay-er.Considering the deficiency of traditional analytic hierarchy process that inaccurately calculated the weight of as -sessment index , the three-scale analytic hierarchy process model was introduced .By the improved model , the weights of assessment indexes were calculated precisely .Secondly , the assessment system for bridge safety was e-valuated by using fuzzy comprehensive evaluation method .Combining the fuzzy weighted average operator with the maximum membership degree principle of fuzzy comprehensive evaluation , the mark of bridge safety condition was determined, and, on this basis, the condition level of bridge safety was obtained according to remark sets .Finally, the integrated assessment method was applied to an engineering example for Jiangpotou Bridge .The assessment re-sult for the bridge was consistent with current standard , and proved the feasibility and practicality of the method .%为了客观、系统地评估桥梁安全状况，提出三标度层次分析法与模糊综合评判的集成评估方法。首先，运用层次分析法分析影响桥梁安全状况的评估指标，进而建立桥梁安全评估的目标层、准则层、指标层，并形成桥梁安全评估指标体系。采用三标度层次分析法计算评估指标权重。其次，通过模糊综合评判模型，对桥梁安全评估体系进行分层次模糊综合评估。结合模糊加权平均算子和模糊综合评判最大隶属度原则，确定桥梁安全状况分值，参照评语集得出桥梁安全等级。最后，将该集成评估方法应用到江坡头大桥工程实例中，评估结果与现行规范一致，体现了该方法的可行性与实用性。