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Nonlinear dynamic behaviour and seismic fragility analysis of irregular multi-span RC bridges

Nonlinear dynamic behaviour and seismic fragility analysis of irregular multi-span RC bridges
Nonlinear dynamic behaviour and seismic fragility analysis of irregular multi-span RC bridges

This paper investigates the nonlinear dynamic behaviour and failure probability of multi-span Reinforced Concrete (RC) bridges supported on piers of unequal heights. To this end, a three-dimensional nonlinear finite element model of RC bridges with substructure irregularity is developed. The model is verified against an available experimental data of a large-scale shake table test results of a benchmark irregular two-span RC bridge. Six hypothetical two-span irregular RC bridges with piers varied in height, and various superstructure mass-distribution conditions (equal and unequal) and a regular bridge layout (as a reference) are considered. Through Incremental Dynamic Analyses (IDAs), the seismic performance of selected bridge layouts is investigated at both local and global scales. Finally, the influence of bridge layout on seismic vulnerability of piers of varying heights is analysed. Results show that the unbalanced seismic displacement demand and failure probability of different bents of a multi-span irregular RC bridge significantly depend on the height of piers and their arrangement. Therefore, the typical presumption of shorter piers having a higher failure probability due to their higher seismic force absorption is not always the most possible failure mechanism.

Fragility analysis, IDA, Irregularity, Modal analysis, RC bridge, Reinforced concrete
2352-0124
1730-1750
Afsar Dizaj, Ebrahim
387bbd6f-a74a-47fe-9637-af62729ba50d
Salami, Mohammad R.
7c540b73-5c95-4539-abcc-a26a45311934
Kashani, Mohammad M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Afsar Dizaj, Ebrahim
387bbd6f-a74a-47fe-9637-af62729ba50d
Salami, Mohammad R.
7c540b73-5c95-4539-abcc-a26a45311934
Kashani, Mohammad M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d

Afsar Dizaj, Ebrahim, Salami, Mohammad R. and Kashani, Mohammad M. (2022) Nonlinear dynamic behaviour and seismic fragility analysis of irregular multi-span RC bridges. Structures, 44, 1730-1750. (doi:10.1016/j.istruc.2022.08.112).

Record type: Article

Abstract

This paper investigates the nonlinear dynamic behaviour and failure probability of multi-span Reinforced Concrete (RC) bridges supported on piers of unequal heights. To this end, a three-dimensional nonlinear finite element model of RC bridges with substructure irregularity is developed. The model is verified against an available experimental data of a large-scale shake table test results of a benchmark irregular two-span RC bridge. Six hypothetical two-span irregular RC bridges with piers varied in height, and various superstructure mass-distribution conditions (equal and unequal) and a regular bridge layout (as a reference) are considered. Through Incremental Dynamic Analyses (IDAs), the seismic performance of selected bridge layouts is investigated at both local and global scales. Finally, the influence of bridge layout on seismic vulnerability of piers of varying heights is analysed. Results show that the unbalanced seismic displacement demand and failure probability of different bents of a multi-span irregular RC bridge significantly depend on the height of piers and their arrangement. Therefore, the typical presumption of shorter piers having a higher failure probability due to their higher seismic force absorption is not always the most possible failure mechanism.

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Dizaj et al_Accepted_Manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 28 August 2022
e-pub ahead of print date: 7 September 2022
Published date: October 2022
Additional Information: Publisher Copyright: © 2022 Institution of Structural Engineers
Keywords: Fragility analysis, IDA, Irregularity, Modal analysis, RC bridge, Reinforced concrete

Identifiers

Local EPrints ID: 470648
URI: http://eprints.soton.ac.uk/id/eprint/470648
ISSN: 2352-0124
PURE UUID: a9d8aff4-31d6-46e7-9339-a85b54a2daa2
ORCID for Mohammad M. Kashani: ORCID iD orcid.org/0000-0003-0008-0007

Catalogue record

Date deposited: 17 Oct 2022 16:41
Last modified: 18 Oct 2022 01:50

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Contributors

Author: Ebrahim Afsar Dizaj
Author: Mohammad R. Salami

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