Abstract

In order to comprehensively and accurately understand the condition of modular expansion joints in large-span bridges during their service life, and to develop reasonable and effective disease control strategies, this paper explores a more timely and precise evaluation method for the state of expansion joints. This method focuses on typical issues associated with modular expansion joints, utilizing on-site detection and health monitoring, building upon existing general evaluation methods for bridges. Taking a suspension bridge as an example, on the basis of verifying the feasibility of the expansion joint state evaluation method, a performance degradation model and monitoring evaluation results were established based on the detection technology condition evaluation score. Analysis shows that the combination of sub-item classification and single-item quantitative control indicators for on-site detection, and the analysis of temperature correlation characteristics of expansion joint displacement monitoring, can effectively determine the service performance and disease impact of expansion devices, providing more scientific and reasonable support for the development of disease control strategies for modular expansion devices.