Research on DIC Monitoring of Dynamic Deflection and Damage Identification Method for Small and Medium-Span Bridges

Authors

• WANG Yong, School of Ocean and Civil Engineering , Shanghai Jiao Tong University , Shanghai 200240 , ChinaFollow
• LI Derui, School of Ocean and Civil Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China ;Shanghai Jiaotu Technology Co ., Ltd., Shanghai 200240 , China
• TANG Haotian, School of Ocean and Civil Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
• YAN Xingfei, Shanghai Urban Construction Design and Research Institute (Group ) Co., Ltd., Shanghai 200125 , China
• CHENG Bin, School of Ocean and Civil Engineering , Shanghai Jiao Tong University , Shanghai 200240 , ChinaFollow

Corresponding Author

程斌，男，博士，教授.E-mail：cheng_bin@sjtu.edu.cn

Abstract

A large number of built small and medium-span bridges in China are facing the problem of increasingly degrading structural performance. Therefore, it is of great significance to carry out lightweight intelligent monitoring and realize damage identification and early warning, so as to ensure the safe operation of these bridges. For typical small and medium-span simply supported beam bridges, a damage analysis method based on measured dynamic deflection data was established by combining the influence line theory and mechanical constitutive equations. Furthermore, based on the high-precision monitoring algorithm and instruments of digital image correlation (DIC), the real-time dynamic deflection data of the bridges were obtained. It is shown that typical defects such as sectional stiffness degradation, hinge joint damage and failure, and support performance degradation are effectively identified. The results were applied to the digital transformation project of an overpass in Shanghai, which verifies the effectiveness of the dynamic deflection DIC optical measurement technology and the damage identification method and indicates that the proposed method has good value in popularization and application.

Publication Date

6-27-2026

DOI

10.14048/j.issn.1671-2579.2026.03.013

First Page

113

Last Page

122

Submission Date

June 2026

Recommended Citation

Yong, WANG; Derui, LI; Haotian, TANG; Xingfei, YAN; and Bin, CHENG (2026) "Research on DIC Monitoring of Dynamic Deflection and Damage Identification Method for Small and Medium-Span Bridges," Journal of China & Foreign Highway: Vol. 46: Iss. 3, Article 13.
DOI: 10.14048/j.issn.1671-2579.2026.03.013
Available at: https://zwgl1980.csust.edu.cn/journal/vol46/iss3/13

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