既有桥梁可靠度与安全使用寿命的综合评估

常用的桥梁技术状况评估方法以静力强度为主要指标,所得评估结论一般难以对既有桥梁的可靠度和安全使用寿命做出评估。将结构疲劳损伤的发展速率和构件的冗余度作为影响桥梁可靠度和安全使用寿命的主要指标,提出运用层次分析法(A H P)的基本原理,通过建立基于疲劳损伤评价方法的综合评价模型,评判既有桥梁技术状况。以禹门口公路黄河大桥吊索的综合评估为例,对该方法的实际应用予以说明。

Integrative Assessment on an Old Bridge Based on Reliability and Safe Life-span

The technical state of an old bridge is usually evaluated using strength theory.Based on the evaluated results,it is difficult to assess the reliability and safe life-span.In this contribution,based on the principle of the Analytical Hierarchy Process(AHP),an integrative model is proposed to assess the state of an old bridge.In this model,the developing rate of structural fatigue damage and the redundancy of element are two major evaluation parameters.The application of the proposed model to the evaluation of a practical bridge is illustrated by the assessment of the cable of Yumenkou Highway Yellow River Bridge.