预应力混凝土连续刚构桥模糊综合评估法研究

为了准确评估预应力混凝土连续刚构桥的健康状态,提出了基于层次分析法和模糊理论的预应力混凝土连续刚构桥状态综合评估方法。首先采用层析分析法（AHP）建立了预应力混凝土连续刚构桥底层-中间层-顶层的三层状态评估指标体系,确定了各层指标状态和总体评估状态的等级划分,制定了预应力混凝土连续刚构桥状态评估体系中各层指标的定量指标评判标准。其次选择了梯形和半梯形的隶属函数,建立了预应力混凝土连续刚构桥模糊综合评估法的主要步骤,提出了状态评估体系中各层指标常权、变权和评判向量的计算方法,最后将该方法应用在钦江三桥的状态评估中。结果表明：预应力混凝土连续刚构桥状态评估方法可以评估预应力混凝土连续刚构桥的状态,采用该方法评估的钦江三桥的状态为"优秀",与桥梁的荷载试验结果一致,评估结果验证了提出的模糊综合评估方法的可行性与有效性。

Study on Fuzzy Comprehensive Evaluation Method of Prestressed Concrete Continuous Rigid Frame Bridge

In order to evaluate the health status of prestressed concrete continuous rigid frame bridge accurately, a comprehensive evaluation method based on Analytic Hierarchy Process (AHP) and fuzzy theory was proposed. Firstly, the three-layer state evaluation index system (bottom-middle-top) of prestressed concrete continuous rigid frame bridge was established with the method of chromatography analysis, the grade division for index state of each layer and overall evaluation state was determined, and the quantitative index evaluation standard of each layer in the state evaluation system of prestressed concrete continuous rigid frame bridge was established. Secondly, the membership function of trapezoid and semi trapezoid was selected, the main steps of fuzzy comprehensive evaluation method of prestressed concrete continuous rigid frame bridge were established, and the calculation methods of constant weight, variable weight and evaluation vector of each index in the state evaluation system were proposed. Finally, the method was applied to the state evaluation of Qinjiang third bridge. The results show that the state evaluation method of prestressed concrete continuous rigid frame bridge proposed can evaluate the state of prestressed concrete continuous rigid frame bridge, the state of Qinjiang third bridge evaluated by this method presents "good", which is consistent with load test results. Feasibility and effectiveness of the proposed method are verified.