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Abstract
This paper presents a structural robustness assessment of I-girder bridges through non-linear numerical analysis. Experimental tests were conducted on two scaled bridge specimens, one intact and the other damaged, subjected to asymmetric loading conditions. A nonlinear finite element model was established and validated by comparing it with experimental results in load-displacement and load-strain curves. This paper proposes a new work-based robustness assessment method and corresponding robustness index. Also, parametric studies on the effects of the vertical position of the crossbeam along girder height and the effect of crossbeam cross-section under asymmetrical loading were performed and compared using load-displacement curves. Based on the proposed method, the robustness of two, three, and four I-girder bridges was found to be 0.133, 0.296, and 0.415 with their threshold values equal to 0.269, 0.283, and 0.283 respectively. It is concluded that three I-girder bridges should be considered robust according to the proposed robustness index. The rectangular cross-section of the crossbeam showed improved post-fracture behavior for the studied model in this research based on load-displacement curves predicted by FE analysis, while crossbeam position along girder height can influence the overall post-fracture behavior of bridge structure depending on damage scenarios.
Original language | English |
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Number of pages | 20 |
Journal | STRUCTURE AND INFRASTRUCTURE ENGINEERING |
DOIs | |
Publication status | E-pub ahead of print - 10 Dec 2024 |
MoE publication type | A1 Journal article-refereed |
Keywords
- I-girder bridges
- concrete-steel composite
- member fracture
- non-linear analysis
- redundancy
- robustness
- structural stability
- torsion
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AoF Mobility to China/Lin: Force transfer mechanism and seismic performance of demountable connections for composite pier-coupling beam
Lin, W. (Principal investigator)
01/03/2022 → 28/02/2025
Project: Academy of Finland: Other research funding