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Experimental study on the post-tensioned unbonded prestressing UHPC prefabricated retaining blocks for highway bridges

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Abstract

Traditional sacrificial concrete shear keys are generally employed in highway bridges to restrain the excessive transverse displacements of the bridge superstructures and protect the substructures from being seriously damaged under the earthquakes. However, the post-earthquake rehabilitation or reconstruction of the conventional concrete shear keys are difficult and inconvenient. To this end, this paper proposed and designed a novel modified post-tensioned unbonded prestressing ultra-high-performance-concrete (UHPC) prefabricated retaining block (UHPC-PRB) structure with the straight joint connection. The novel UHPC-PRB structure consisted of a prefabricated UHPC retaining block, a prestressing anchorage system, and a cast-in-situ cap beam. The prefabricated UHPC retaining block was installed to the cast-in-situ cap beam using the unbonded prestressing tendons. The proposed UHPC-PRB structure is supposed to be effective in not only providing the same functionality as that of the traditional concrete shear keys, but also is expected of simplifying the retrofit procedure and reducing the rehabilitation expense simultaneously. To investigate the seismic behavior of the proposed UHPC-PRB structure, four test specimens were designed and the pseudo-static tests were carried out. The damage process, displacements, strains, and stress states of the specimens were studied. In addition, the influences of the loading height, thickness of the UHPC retaining block, and the initial tension of prestressing tendons on the seismic performance of the proposed UHPC-PRB structures were also examined. Finally, the experimental results indicated that, (i) the proposed UHPC-PRB structures had excellent lateral deformation capacity and self-resetting ability; (ii) the initial tension of prestressing tendons had significant effects on the lateral displacement, critical rotational load, and horizontal load-carrying capacity of the UHPC retaining blocks; (iii) the prestress loss of prestressing tendons had certain effect on the development of the bilinear analytical model of the UHPC retaining blocks, but this effect could be ignored in practical highway bridges; and (iv) increase of the horizontal loading height could reduce the critical rotational load and load-carrying capacity of the UHPC retaining blocks.

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Acknowledgements

The authors gratefully acknowledge the support of this research by Scientific Research Foundation of Hunan Provincial Education Department through Grants No. 21B0148, the National Natural Science Foundation of China through Grants No. 51908481, Natural Science Foundation of Hunan Province through Grant No. 2020JJ5543 and the High-level Talent Gathering Project in Hunan Province through Grants No. 2019RS1059.

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Authors and Affiliations

  1. College of Civil Engineering, Xiangtan University, Xiangtan, China

    Wenpeng Wu & Jialong He

  2. College of Civil Engineering, Hunan University, Changsha, China

    Lifeng Li

  3. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China

    Huihui Li

  4. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, China

    Huihui Li

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  1. Wenpeng Wu
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Correspondence to Huihui Li.

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Wu, W., He, J., Li, L. et al. Experimental study on the post-tensioned unbonded prestressing UHPC prefabricated retaining blocks for highway bridges. Bull Earthquake Eng 21, 6477–6498 (2023). https://doi.org/10.1007/s10518-023-01777-w

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