桥梁状态的区间可拓评估模型

Interval extension evaluation model of bridge condition

为了较好地反映桥梁的使用状态,解决目前桥梁状态评估中存在主观影响因素过多与评价指标权重不确定性等问题,基于区间可拓评价理论,采用了将专家主观权重和客观权重相结合的组合权重作为最终指标权重,建立了桥梁状态的区间可拓评估模型,应用区间关联函数计算待评价桥梁关于各评价等级的关联度,根据最大隶属度原则进行桥梁状态等级评判。应用模型对某连续梁桥进行状态评估,其最大隶属度为0.20,表明该桥梁状态等级为Ⅲ级。可见,该模型可有效评估桥梁状态,评估结果客观。

In order to better reflect the service condition of bridge and reduce the influence of many subjective factors and the uncertainty of indexes weights on the condition evaluation of existed bridge, based on interval extension theory, an interval extension evaluation model of bridge condition was proposed. Experts＇ subjective weights and objective weights were combined as the aim weights of evaluation indexes. The correlation degrees between bridge condition and evaluation grades were calculated by interval relation function. Bridge condition was evaluated according to the maximum subordination principle. The condition evaluation result of a continuous beam bridge shows that the maximum subordination value is 0.20, which indicates the state grade of the bridge is Ⅲ, so the model can evaluate the bridge condition effectively and the evaluation result is objective. 5 tabs, 2 figs, 10 refs.