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Precast segmental piers: testing, modeling and seismic assessment of an emulative connection based on a grouted central tenon

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Abstract

Nowadays precast reinforced concrete (PRC) piers have found increasing application in bridge project, due to their favourable advantages such as significant improvement in quality, reduction in construction period, less environmental impact and traffic disturbance. Seismic performance of PRC piers highly depends on the design and detailing of the pier-foundation connection. Due to limited knowledge, the application of PRC piers is restricted to low-seismic regions while is rarely in high-seismic regions. In this paper, an emulative connection method is proposed for PRC piers which combines conventional grouted splice sleeves (GSS) for the longitudinal bar splice and a grouted central tenon (GCT). To begin with, a cyclic pseudo-static experiment was performed on three piers to evaluate the seismic performance, including one CIP pier, two PRC piers with the conventional GSS and proposed GSS-GCT connections, respectively. It was found that the GSS-GCT connection could be an effective solution since it apparently increased the lateral load and energy dissipation capacities and reduced the residual displacement. Moreover, inspired by the shear-induced slip observed during the test, a fiber-based finite element model is developed for PRC piers, which is, first-of-its-kind, capable of accounting for cyclic rebar bond-slip degradation, dowel action and friction. Good agreements are obtained between the numerical and experimental results. Finally, the superior seismic performance of the proposed method is confirmed by the capacity response spectrum method.

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(adopted from Tassios and Vintzēleou 1987)

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Any data or materials presented in this study is available upon request

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Acknowledgements

The experimental tests were conducted in the Structural Laboratory of Nanjing Tech University, and the specimens were professionally fabricated by CCCC Second Harbour Engineering Company Ltd. The authors particularly acknowledge the contributions in the experimental program of Weiding Zhuo, Luyao Shi, Yonghui Li and others.

Funding

This research is supported by National Key Research and Development Program of China (2019YFE0119800), the National Natural Science Foundation (51808113, 52178124), and Zhishan Youth Scholar Program of SEU (2242021R41172).

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The conceptualization, methodology, resources were provided by ZL. The experiment program was conducted by GL and HL. The finite element modeling and validation were performed by HL, TT, and SW. The writing, reviewing and editing were mainly by TT, HL, and ZL. Results were commented by ZL and TT. All authors read and approved the final manuscript.

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Correspondence to Teng Tong.

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Liu, Z., Lei, H., Tong, T. et al. Precast segmental piers: testing, modeling and seismic assessment of an emulative connection based on a grouted central tenon. Bull Earthquake Eng 20, 2529–2564 (2022). https://doi.org/10.1007/s10518-022-01335-w

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  • DOI: https://doi.org/10.1007/s10518-022-01335-w

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