基于灰色系统理论的连续梁桥损伤诊断方法研究

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中图分类号：TU311；TU997 文献标志码：A

Abstract：To ensure lifelong structural safety and service reliability of bridges，damage diagnosis research for existing structures holdssignificant theoretical andpractical value.This study proposesan innovative methodology integrating grey system theory with the difference curvature of influence lines.A finite element modelof a three-span continuous box-beam bridge with uniform cross-sections was established for numerical simulation.Key findings demonstrated： （1） Damage localization was precisely achieved through influence line difference curvature，with abrupt curvature changes exhibiting spatial correspondence to damage locations; （2）Grey correlation coeffcients quantifieddamage severity linearly（e.g.，deflection influence line coefficients： 0.6856，0.7956，0.8898 for single-point damage; 0.717 5， 0.791 4，0.891 2 for multi-point damage），where higher values indicated greater damage severity. Integration with structural health monitoring systems enables bridge condition assessment using long-term data，supporting intelligent maintenance and preventive preservation strategies.

Key words： influence line; damage diagnosis; difference curvature; grey system theory

桥梁作为公路及城市道路网络的关键基础设施，其结构完整性和运营安全性直接影响社会经济发展和人民日常生活。（剩余6870字）