基于模糊理论的钢管混凝土拱桥状态评估方法

为准确评估大跨度钢管混凝土拱桥的状态,提出层次分析法和模糊理论相结合的模糊综合评估方法。首先基于层次分析法建立大跨度钢管混凝土拱桥状态评估的指标体系、权重体系,根据5种桥梁健康状态确定评估体系中各层指标的评判标准;对状态评估的底层指标进行无量纲化处理,基于隶属函数对桥梁状态进行模糊综合评估;最后将该方法应用于南宁永和大桥(计算跨径346.49m的中承式钢管混凝土拱桥)的状态评估中。结果表明:模糊综合评估方法可以评估大跨度钢管混凝土拱桥的状态,采用该方法评估的南宁永和大桥的状态为“较好”,与桥梁实际状态相符;评估结果验证了基于层次分析法建立的状态评估体系和提出的模糊综合评估方法的可行性。

An Evaluation Method for State of Concrete-Filled Steel Tube Arch Bridge Based on Fuzzy Theory

In order to accurately evaluate the state of long-span concrete-filled steel tube arch bridge, a method of fuzzy comprehensive evaluation based on an analytic hierarchy process and the fuzzy theory was proposed. Firstly, based on the analytic hierarchy process, an index system and a weight system of state evaluation for long-span concrete-filled steel tube arch bridge were established, and the criteria for evaluating indicators at all levels in the state evaluation system were determined according to five kinds of bridge health conditions. Secondly, dimensionless processing of the bottom indicators of state evaluation was carried out, and a fuzzy comprehensive evaluation of bridge state was carried out based on the membership function. Finally, the method was applied to the state evaluation for the Yonghe Bridge (a through concrete-filled steel tube arch bridge with a calculated span of 346.49 m) in Nanning. The results show that the state of long-span concrete-filled steel tube arch bridge can be evaluated by the method of fuzzy comprehensive evaluation;the state of the Yonghe Bridge evaluated by this method is "better", which is consistent with the actual state of the bridge;the evaluation results validate the feasibility of the state evaluation system based on the analytic hierarchy process and the proposed fuzzy comprehensive evaluation method.