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Structural Engineering and Mechanics Volume 85, Number 4, February25 2023 , pages 563-571 DOI: https://doi.org/10.12989/sem.2023.85.4.563 |
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An experimental study of the mechanical performance of different types of girdling beams used to elevate bridges |
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Fangyuan Li, Wenhao Li and Peifeng Wu
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| Abstract | ||
| Girdling underpinning joints are key areas of concern for the pier-cutting bridge-lifting process. In this study, five specimens of an underpinning joint were prepared by varying the cross-sectional shape of the respective column, the process used to treat the beam-column interface (BCI), and the casting process. These specimens were subsequently analyzed through static failure tests. The BCI was found to be the weakest area of the joint, and the specimens containing a BCI underwent punching shear failure. The top of the girdling beam (GB) was subjected to a circumferential tensile force during slippage failure. Compared to the specimens with a smooth BCI, the specimens subjected to chiseling exhibited more pronounced circumferential compression at the BCI, which in turn considerably increased the shear capacity of the BCI and the ductility of the structure. The GB for the specimens containing a column with a circular cross-section exhibited better shear mechanical properties than the GB of other specimens. The BCI in specimens containing a column with a circular cross-section was more ductile during failure than that in specimens containing a column with a square cross-section. | ||
| Key Words | ||
| beam-column interface (BCI); casting process; field static test; girdling beam (GB); mechanical performance | ||
| Address | ||
| Fangyuan Li, Wenhao Li and Peifeng Wu: Department of Bridge Engineering, Tongji University, Shanghai 200092, China | ||