基于改进正负靶心决策理论的钢筋混凝土桥梁耐久性评估模型  

Durability assessment model of reinforced concrete bridges based on improved positive and negative clouts decision theory

作　　者：柴乃杰 周文梁[1] CHAI Nai-jie;ZHOU Wen-liang(School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学交通运输工程学院,长沙410075

出　　处：《吉林大学学报（工学版）》2023年第12期3481-3491,共11页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(U1934216,71871226);中国国家铁路集团有限公司系统性重大课题项目(P2021X008)。

摘　　要：钢筋混凝土桥梁耐久性评估属于在不确定环境下的多属性决策问题,针对其指标数据信息不完整的特点,本文提出了基于改进正负靶心的灰靶评估模型。引入正靶心点距及投影值、负靶心点距及投影值、靶心系数、正负靶心距和综合靶心距等概念,实现桥梁耐久性的宏观和微观一体化分析,并将模型应用于甘肃省境内9座钢筋混凝土公路桥梁耐久性评估。结果表明:该9座桥梁的耐久性水平优劣从高到低排序为:桥梁6#、7#、4#、8#、1#、3#、2#、5#、9#,其中桥梁6#、7#的耐久性等级为Ⅱ级,桥梁1#、3#、4#和8#的耐久性等级为Ⅲ级,而桥梁2#、5#和9#的耐久性等级为Ⅳ级。通过指标敏感性分析,得出桥梁耐久性的绝对平均变化率随权重变化率绝对值增加呈线性增长趋势,而且指标权重与其敏感性有一定关系,即在指标权重变化率相同的情况下,指标权重越大,综合评价结果的平均变化率也越大。Durability evaluation of reinforced concrete bridges is a multi-attribute decision-making problem in uncertain environment.According to the characters of uncertain evaluation indicator and its date information,the gray-target assessment model based on improved positive and negative bulls-eye method was proposed,and the concepts of positive and negative bulls-eye distance and projection value,bulls-eye coefficient,positive and negative bulls-eye distance and comprehensive bulls-eye distance were introduced to realize the integrated macro and micro analysis of bridge durability.The model was applied in the durability assessment of nine reinforced concrete highway bridges in Gansu province,the results show that the ranking orders of durability between the nine bridges:Bridge 6#>7#>4#>8#>1#>3#>2#>5#>9#,and the durability of Bridges 6#,7#belong to LevelⅡ,the durability of Bridges 1#,3#,4#and 8#to LevelⅢ,and the durability of Bridges2#,5#,9#to LevelⅣ.Through index sensitivity analysis,it is concluded that the absolute average change rate of bridge durability increases linearly with the increase of absolute value of index weight change rate,and there is a certain relationship between index weight and sensitivity,that is,when the index weight change rate is the same,the higher the index weight,the greater the average change rate of comprehensive evaluation results.

关 键 词：桥梁耐久性 正负靶心系数 改进灰靶决策 综合靶心距值 

分 类 号：TU375[建筑科学—结构工程]