Shen, Y;
Freddi, F;
Li, J;
(2022)
Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns.
Engineering Structures
, 253
, Article 113833. 10.1016/j.engstruct.2021.113833.
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Abstract
The present paper investigates an innovative seismic-resilient bridge column-footing socket connection (SC) for post-tensioned concrete-filled steel tube (PCFT) columns defined according to the Accelerated Bridge Construction (ABC) requirements. The PCFT-SC column uses an embedded steel tube to dissipate the seismic energy and unbonded post-tensioned (PT) bars to improve the self-centering capacity. Experimental tests were performed on a PCFT-SC column, and the seismic response was compared with the PCFT column with hybrid connection (HC) previously investigated by the authors. The experimental tests confirmed that the PCFT-SC column could develop large strength, stiffness, and ductility capacity and that, compared with the PCFT-HC column, its seismic performance is competitive for drifts up to 2.8%. For larger drifts, the performances are slightly reduced due to the steel tube local buckling and the resulting PT force loss. However, even in these cases, the PCFT-SC column could be preferred due to its constructional advantages. Simplified models of PCFT columns with the SC and HC were developed in OpenSees, including modeling details accounting for the effects of the PT force loss. The numerical results, calibrated against the experimental data, showed the importance of considering PT force loss in the cyclic load analysis for PCFT columns.
| Type: | Article |
|---|---|
| Title: | Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.engstruct.2021.113833 |
| Publisher version: | https://doi.org/10.1016/j.engstruct.2021.113833 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Bridge column, Concrete-filled steel tube (CFT), Column-footing connections, Unbonded post-tensioning, Cyclic testing, Numerical modeling |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10141658 |
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