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Abstract:
Continuous rigid-frame bridges with cast-in-place or prefabricated super-high piers with grouted sleeve connections (CSHP-B or PSHP-B) exhibit significantly high flexibility. The earthquake-induced pounding and its influence on the seismic performances of CSHP-B and PSHP-B remain unclear. In this study, 1/20-scaled models of a CSHP-B and PSHP-B and relevant adjacent approach model bridges were designed and manufactured. Subsequently, shaking table tests were conducted regarding the pounding response and its relevant influence on the seismic performances of the CSHP-B and PSHP-B under excitations of non-long-period ground motions, non-pulse-like long-period ground motions, and near-fault pulse-type (NFPT) ground motions. The experimental results show that when considering pounding, the peak displacements of the main beams (pier top) of the CSHP-B and PSHP-B decreased, while the relevant peak displacements of the adjacent bridge model increased. Moreover, considering pounding, the peak displacements of the main beams (pier top) of the PSHP-B are larger than those of the CSHP-B; the decreasing and increasing ratios of the peak displacements of the PSHP-B (- 8.6%-19.8%) and adjacent model bridge (+6.9%-+17.5%) are both higher. The peak pounding force and pounding number between the PSHP-B or CSHP-B and the adjacent model bridge both increase with increasing excitation intensity. However, the pounding number between the main bridge and the adjacent model bridge decreased under the excitations of the NFPT ground motions. In addition, compared with the CSHP-B, the peak pounding force and pounding number between the PSHP-B and the adjacent model bridge are relatively larger and smaller, respectively. Furthermore, when considering pounding, the influence of the high-order modes on the displacement response of the main beams increases, while the strain and moment responses of the pier bottoms decrease, and the development of the damage mode of PSHP-B changes more significantly. © 2024 Chang'an University. All rights reserved.
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China Journal of Highway and Transport
ISSN: 1001-7372
Year: 2024
Issue: 9
Volume: 37
Page: 68-82
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 13
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