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学者姓名：肖靖林
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Abstract ：
The normal service of reinforced concrete hollow-slab beams, which are widely used in small- and medium-span bridges, is a topic of interest. This paper presents an experimental study on four existing hollow-slab beams removed from a real bridge. The mechanical properties, including failure mode, load-deflection response, crack development and load-strain response, were investigated. Moreover, a fibre beam element-based model updating method was applied to these hollow-slab beams for material property parameter inversion and quantitative structural performance evaluation. The two-step model updating achieved accurate inversion of the material property parameters. The updated fibre beam element-based model can reproduce the load-deflection response and crack width development well, i.e., achieve quantitative structural performance evaluation, and can assist with further maintenance decisions such as designing a strengthening scheme. The results indicate that evaluating the ultimate capacity on the basis of stiffness is not very reliable because a member with greater stiffness may not always possess a greater ultimate capacity. The yield strength of steel bars is the predominant parameter of the ultimate capacity; thus, to evaluate the ultimate capacity, more attention should be given to assessing the yield strength of steel bars instead of testing the stiffness under a normal service load. Although the initial stiffness values of these existing hollow-slab beams decreased by 17 similar to 33 %, the beams exhibited high ductility, and their actual residual ultimate capacity values exceeded the design expectations by 7 similar to 10 %. In future bridge maintenance projects, the fibre beam element-based model updating method can be implemented with deflection and crack data from field static load tests to predict material property parameters and to quantitatively evaluate performance.
Keyword ：
Existing reinforced concrete (RC) bridge Existing reinforced concrete (RC) bridge Fibre beam element-based model Fibre beam element-based model Full-scale experiment Full-scale experiment Hollow-slab beam bridge Hollow-slab beam bridge Material property inversion Material property inversion Model updating Model updating Structural performance evaluation Structural performance evaluation
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| GB/T 7714 | Xiao, Jing-Lin , Liu, Yu-Fei , Feng, Hao-Long et al. Performance evaluation of existing reinforced concrete hollow-slab beams: Experiments and fibre beam element-based model updating [J]. | ENGINEERING STRUCTURES , 2025 , 326 . |
| MLA | Xiao, Jing-Lin et al. "Performance evaluation of existing reinforced concrete hollow-slab beams: Experiments and fibre beam element-based model updating" . | ENGINEERING STRUCTURES 326 (2025) . |
| APA | Xiao, Jing-Lin , Liu, Yu-Fei , Feng, Hao-Long , Nie, Jian-Guo . Performance evaluation of existing reinforced concrete hollow-slab beams: Experiments and fibre beam element-based model updating . | ENGINEERING STRUCTURES , 2025 , 326 . |
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