基于权重融合法的跨海桥梁部位及部件权重体系分析

桥梁技术评定工作中存在桥梁部位、部件权重与实际状况匹配度不足的情况,本文采用层次分析法、专家群组分析和熵权法构建桥梁部位及部件权重综合分析体系。通过层次分析法以及专家群组分析得出桥梁部位及部件“主观权重”,采用熵权法分析桥梁结构健康监测数据得出桥梁部位及部件的“客观权重”,通过权重融合得到兼顾主、客观因素的桥梁部位及部件权重体系。以港珠澳大桥青州航道桥为分析对象,对比现行桥梁技术状况评定标准给出权重体系,结果表明：采用群组分析法得出权重值与标准权重值基本一致。采用熵权法得出的上部结构权重值比标准权重值稍大,下部结构、桥面系的权重值基本一致。通过权重融合法得到的上部结构权重值偏大,桥面系权重值偏小,下部结构权重值基本一致。通过权重融合得到的分析结果,综合考虑了主、客观因素,更贴近工程实际情况,合理反映桥梁部位及部件权重。

Weight System Analysis of Bridge Parts and Components based on Weight Fusion Method

In the bridge technical evaluation work, there is a lack of matching degree between the bridge parts and component weights and the actual situation. This paper uses AHP, expert group analysis and entropy weight method to build a comprehensive analysis system of bridge parts and component weights. The "subjective weight" of bridge parts and components is obtained through analytic hierarchy process (AHP) and expert group analysis. The "objective weight" of bridge parts and components is obtained by using entropy weight method to analyze the bridge structure health monitoring data. The bridge parts and components weight system that considers both subjective and objective factors is obtained through weight fusion. Taking the Qingzhou Channel Bridge of Hong Kong Zhuhai Macao Bridge as the analysis object, the weight system is given by comparing the current bridge technical status evaluation standards. The results show that the weight value obtained by the group analysis method is basically consistent with the standard weight value. The weight value of superstructure obtained by entropy weight method is slightly larger than the standard weight value, and the weight value of substructure and bridge deck system is basically the same. The weight value of the superstructure obtained by the weight fusion method is too large, the weight value of the bridge deck system is too small, and the weight value of the substructure is basically the same. The analysis results obtained by weight fusion comprehensively consider the subjective and objective factors, which are closer to the actual situation of the project and reasonably reflect the weight of bridge parts and components.