Structural Engineering and Mechanics

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An experimental study of the mechanical performance of different types of girdling beams used to elevate bridges

  • Fangyuan Li (Department of Bridge Engineering, Tongji University) ;
  • Wenhao Li (Department of Bridge Engineering, Tongji University) ;
  • Peifeng Wu (Department of Bridge Engineering, Tongji University)
  • Received : 2022.02.23
  • Accepted : 2023.01.30
  • Published : 2023.02.25
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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.

Keywords

Acknowledgement

The research described in this paper was financially supported by the Fundamental Research Funds for the Central Universities (22120180318).

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