基于健康监测的悬索-斜拉协作体系桥梁结构整体响应相关性分析

Correlation Analysis on Overall Response of Bridge Structures in Suspension Cable and Cable-stayed Cooperative System Based on Health Monitoring

摘要:

以某跨黄河空间缆索悬索-斜拉协作体系特大桥为工程依托，针对桥梁健康监测中全参数同等关注、数据庞大的问题，结合皮尔逊相关性系数、熵权法与属性识别理论，构建桥梁整体力学响应综合相关性模型，消除传统层次分析法和德尔菲法的主观干扰。基于该桥健康监测系统14个环境和作用参数，以位移、转角、应变、振动和索夹滑移5个指标表征结构整体响应，开展相关性系数计算、矩阵归一化、熵权计算及属性测度分析，划分参数相关性等级并排序。结果显示，主梁四分点截面结构温度、主梁内温度、主梁主跨跨中结构温度对桥梁整体力学响应线性关联最强，研究明确了环境和作用监测参数优先级，为该类桥梁健康监测数据质量保障提供依据。

Abstract:

Taking a super major bridge with a spatial suspension cable and cable stayed cooperative system across the Yellow River as the engineering background, and aiming at the problems of equal attention to all parameters and massive data in bridge health monitoring, a comprehensive correlation model for the overall mechanical response of the bridge is established in combination with Pearson correlation coefficient, entropy weight method and attribute recognition theory, thus eliminating the subjective interference of traditional analytic hierarchy process (AHP) and Delphi method. Based on 14 environmental and action parameters of the health monitoring system of the bridge, with 5 indicators such as displacement, rotation angle, strain, vibration and cable clamp slip characterizing the overall structural response, the calculations of correlation coefficient, matrix normalization, entropy weight calculation and attribute measure analysis are carried out to classify and rank the parameter correlation levels. The results show that the structural temperature at the four-point section of the girder, the internal temperature of the girder, and the mid-span structural temperature of the girder and main span have the strongest linear correlation with the overall mechanical response of the bridge. The research result clarifies the priority of environmental and functional monitoring parameters, providing a basis for ensuring the quality of health monitoring data for this type of bridge.