Seismic vulnerability assessment of precast post-tensioned segmental bridge piers subject to far-fault ground motions
Seismic vulnerability assessment of precast post-tensioned segmental bridge piers subject to far-fault ground motions
Precast post-tensioned segmental (PPS) bridge piers mitigate global and local damages of bridge structures through natural hinges (joints between their segments) and rocking motion of their segments. The application of the PPS piers is currently growing in Accelerated Bridge Construction (ABC) where the segments are manufactured offsite with higher quality, and are assembled onsite in a short time. Structural vulnerability analysis of the PPS piers is very essential in extending their engineering implementation under seismic loading. Thus, this work particularly focuses on seismic vulnerability assessment of the PPS piers. To achieve this goal, a previously developed and experimentally validated robust Finite Element model of the PPS piers in OpenSees programme is used to analyse PPS piers of various aspect ratios. An equivalent reinforced concrete (RC) pier to one of the PPS piers is also analysed. Incremental Dynamic Analysis (IDA) is performed and fragility curves are generated to evaluate seismic performance of the PPS piers and an equivalent RC pier using a suite of 44 far-fault ground motions. The IDA results show that slenderising the PPS pier tends to change the failure criterion from the yielding of the post-tensioning tendon to the strength loss of the pier. For squat and slender piers, the yielding of the tendon governs the failure of the pier while the strength of very slender PPS piers drops due to second-order effects at small drift values prior to the yielding of the post-tensioning tendon. It is also found from fragility curves that squat piers are more prone to seismic collapse compared to slender piers. The equivalent RC pier reaches slight and medium damage states in lower intensity measures compared to the PPS pier.
Accelerated bridge construction, Far-fault ground motions, Incremental dynamic analysis, Precast post-tensioned segmental columns, Seismic performance assessment
2566-2579
Ahmadi, Ehsan
f1994ae0-2b3e-43c9-a595-032e801aae70
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
December 2021
Ahmadi, Ehsan
f1994ae0-2b3e-43c9-a595-032e801aae70
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Ahmadi, Ehsan and Kashani, Mohammad
(2021)
Seismic vulnerability assessment of precast post-tensioned segmental bridge piers subject to far-fault ground motions.
Structures, 34, .
(doi:10.1016/j.istruc.2021.09.041).
Abstract
Precast post-tensioned segmental (PPS) bridge piers mitigate global and local damages of bridge structures through natural hinges (joints between their segments) and rocking motion of their segments. The application of the PPS piers is currently growing in Accelerated Bridge Construction (ABC) where the segments are manufactured offsite with higher quality, and are assembled onsite in a short time. Structural vulnerability analysis of the PPS piers is very essential in extending their engineering implementation under seismic loading. Thus, this work particularly focuses on seismic vulnerability assessment of the PPS piers. To achieve this goal, a previously developed and experimentally validated robust Finite Element model of the PPS piers in OpenSees programme is used to analyse PPS piers of various aspect ratios. An equivalent reinforced concrete (RC) pier to one of the PPS piers is also analysed. Incremental Dynamic Analysis (IDA) is performed and fragility curves are generated to evaluate seismic performance of the PPS piers and an equivalent RC pier using a suite of 44 far-fault ground motions. The IDA results show that slenderising the PPS pier tends to change the failure criterion from the yielding of the post-tensioning tendon to the strength loss of the pier. For squat and slender piers, the yielding of the tendon governs the failure of the pier while the strength of very slender PPS piers drops due to second-order effects at small drift values prior to the yielding of the post-tensioning tendon. It is also found from fragility curves that squat piers are more prone to seismic collapse compared to slender piers. The equivalent RC pier reaches slight and medium damage states in lower intensity measures compared to the PPS pier.
Text
Ahmadi & Kashani_Accepted_Manuscript
- Accepted Manuscript
More information
Published date: December 2021
Additional Information:
Funding Information:
The authors acknowledge the support received by the UK Engineering and Physical Sciences Research Council (EPSRC) for a Prosperous Nation [grant number EP/R039178/1 ] : SPINE: Resilience-Based Design of Biologically Inspired Columns for Next-Generation Accelerated Bridge Construction ].
Publisher Copyright:
© 2021 The Author(s)
Keywords:
Accelerated bridge construction, Far-fault ground motions, Incremental dynamic analysis, Precast post-tensioned segmental columns, Seismic performance assessment
Identifiers
Local EPrints ID: 451505
URI: http://eprints.soton.ac.uk/id/eprint/451505
ISSN: 2352-0124
PURE UUID: 038e1249-3559-49cf-b97e-9f06f097c146
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Date deposited: 04 Oct 2021 16:33
Last modified: 17 Mar 2024 03:46
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