Impact of asymmetrical corrosion of piers on seismic fragility of ageing irregular concrete bridges
Impact of asymmetrical corrosion of piers on seismic fragility of ageing irregular concrete bridges
This article investigates the seismic fragility of ageing irregular multi-span reinforced concrete (RC) bridges. Different irregularity sources are considered, including: (i) substructure stiffness irregularity arising from the unequal-height piers, (ii) substructure stiffness irregularity arising from the spatially variable (asymmetrical) corrosion damage of piers and (iii) irregular distribution of effective tributary masses on piers of varying heights. To this end, a three-dimensional nonlinear finite element model is developed for multi-span RC bridges and verified against a large-scale shake table test results of a two-span concrete bridge specimen available in the literature. Nonlinear pushover, incremental dynamic and seismic fragility analyses are performed on three groups of two-span RC bridges with different configurations. Moreover, a time-dependent dimensionless local damage index is employed to evaluate the failure sequence and collapse probability of selected bridge layouts. The analysis results of the three studied irregularity sources show the considerable significance of spatially variable corrosion of bridge piers and substructure irregularity on the failure sequence of piers and seismic fragility of multi-span RC bridges. Furthermore, analysis outcomes show that uneven corrosion of piers triggers an unbalanced distribution of seismic ductility demands and irregular seismic response of equal-height multi-span RC bridges.
Fragility analysis, irregularity, local damage index, multi-span bridge, nonlinear dynamic, reinforced concrete, spatially variable corrosion
Afsar Dizaj, Ebrahim
387bbd6f-a74a-47fe-9637-af62729ba50d
Salami, Mohammad R.
db0a471b-65d9-45d6-973b-ae10a3e4febd
Kashani, M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Afsar Dizaj, Ebrahim
387bbd6f-a74a-47fe-9637-af62729ba50d
Salami, Mohammad R.
db0a471b-65d9-45d6-973b-ae10a3e4febd
Kashani, M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Afsar Dizaj, Ebrahim, Salami, Mohammad R. and Kashani, M.
(2023)
Impact of asymmetrical corrosion of piers on seismic fragility of ageing irregular concrete bridges.
Structure and Infrastructure Engineering.
(doi:10.1080/15732479.2023.2271887).
Abstract
This article investigates the seismic fragility of ageing irregular multi-span reinforced concrete (RC) bridges. Different irregularity sources are considered, including: (i) substructure stiffness irregularity arising from the unequal-height piers, (ii) substructure stiffness irregularity arising from the spatially variable (asymmetrical) corrosion damage of piers and (iii) irregular distribution of effective tributary masses on piers of varying heights. To this end, a three-dimensional nonlinear finite element model is developed for multi-span RC bridges and verified against a large-scale shake table test results of a two-span concrete bridge specimen available in the literature. Nonlinear pushover, incremental dynamic and seismic fragility analyses are performed on three groups of two-span RC bridges with different configurations. Moreover, a time-dependent dimensionless local damage index is employed to evaluate the failure sequence and collapse probability of selected bridge layouts. The analysis results of the three studied irregularity sources show the considerable significance of spatially variable corrosion of bridge piers and substructure irregularity on the failure sequence of piers and seismic fragility of multi-span RC bridges. Furthermore, analysis outcomes show that uneven corrosion of piers triggers an unbalanced distribution of seismic ductility demands and irregular seismic response of equal-height multi-span RC bridges.
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Dizaj et al_Accepted_Manuscript
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Impact of asymmetrical corrosion of piers on seismic fragility of ageing irregular concrete bridges
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Accepted/In Press date: 27 June 2023
e-pub ahead of print date: 29 October 2023
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Publisher Copyright:
© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Keywords:
Fragility analysis, irregularity, local damage index, multi-span bridge, nonlinear dynamic, reinforced concrete, spatially variable corrosion
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Local EPrints ID: 480034
URI: http://eprints.soton.ac.uk/id/eprint/480034
ISSN: 1573-2479
PURE UUID: 3dbd7a67-e470-4697-80ef-771c8d8e5355
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Date deposited: 01 Aug 2023 16:37
Last modified: 17 Mar 2024 03:46
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Author:
Ebrahim Afsar Dizaj
Author:
Mohammad R. Salami
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