Journal of Engineering Research

To address the ambiguity in the classification of bridge disease grades, this paper discusses the differences in the setting of key thresholds such as crack width between the current "Technical Condition Evaluation Standards for Highway Bridges" and the "Technical Specifications for Maintenance of Urban Bridges". Through mathematical modeling and fuzzy mathematics theory, a collaborative correction framework of "rigid threshold + flexible transition zone" was proposed, which reduced the uncertainty of grade determination caused by the overlap of thresholds between specifications. The research also proposed a grade arbitration rule based on uncertainty to ensure that the impact of detection errors on grade assessment is minimized, and through the dynamic coupling model of expert weights, the consistency of disease grade determination was improved. Through case verification, the proposed standardized improvement path has high executability in practical operation, providing theoretical basis and technical support for the subsequent revision of bridge maintenance standards.

Bridge disease grade; Normative ambiguity; Threshold overlap; Detection uncertainty; Weight discretization