基于模糊层次分析法的现役桥梁承载状态评估方法研究

Research on the Evaluation Method of Bearing State of Existing Bridges Based on Fuzzy Analytic Hierarchy Process

利用桥梁运营t年后的实际评估参数:抗弯抗剪承载力降低系数、动静刚度降低系数、结构频率降低系数、挠度校验系数、裂缝平均宽度、裂缝平均高度以及裂缝平均间距,结合模糊层次分析法,建立现役钢筋混凝土桥梁结构承载状态评估模型,对实际桥梁进行计算分析与安全状态评估。结果表明,该方法的评估结果和实际桥梁检测评估结论相符,可以用于现役钢筋混凝土梁桥的承载安全状态评估,指导桥梁的维修养护决策。

The evaluation parameters of the bridge after operating t years,such as,decreasing coefficient of the bending shear bearing capacity,decreasing coefficient of the dynamic and static stiffness,decreasing coefficient of the structure frequency,deflection calibration coefficient,the average crack width,the crack average height,the average crack spacing,and fuzzy analytic hierarchy process are used to build the bridge structure bearing condition assessment system,analysis and estimate the bridge safety state.The results show that:the results of this method is similar to the real bridge test evaluation conclusion,this method can be used in the actual reinforced concrete bridge load-bearing security status assessment.