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Effect of Substructure Irregularity on the Seismic Vulnerability of Short-Span Bridges
https://orcid.org/http://orcid.org/0000-0003-2415-0858
https://orcid.org/http://orcid.org/0000-0002-0451-9534
https://orcid.org/http://orcid.org/0000-0002-1476-5763
https://orcid.org/http://orcid.org/0000-0001-7413-6769
Seismic performance and dynamic characteristics of bridge structures are highly influenced by their geometric properties. This paper aims at studying the impact of substructure irregularity on the seismic vulnerability of multicolumn-bent short-span bridges by estimating the capacity of bridge components. For this purpose, incremental dynamic analyses have been performed on two five-span bridge configurations, chosen according to a real case study. The studied bridges present supported on seat-type abutments and differ according to pier heights: regular and irregular substructures with equal and different heights, respectively, have been considered. Pounding of the bridge superstructure portion and nonlinear backfill soil behavior are accounted for in nonlinear time history analyses. Spectral acceleration of the first fundamental period and peak ground velocity are considered as intensity measures, while failure criteria consisted on maximum columns drift ratio and deck unseating at abutments. The performed analyses revealed a response of the irregular bridge significantly worser than the regular one. Besides, the two failure criteria affect the seismic vulnerability of the regular bridge almost equally and for the irregular bridge, column damage is always recognized to be the main reason of the structural collapse.
Effect of Substructure Irregularity on the Seismic Vulnerability of Short-Span Bridges
https://orcid.org/http://orcid.org/0000-0003-2415-0858
https://orcid.org/http://orcid.org/0000-0002-0451-9534
https://orcid.org/http://orcid.org/0000-0002-1476-5763
https://orcid.org/http://orcid.org/0000-0001-7413-6769
Seismic performance and dynamic characteristics of bridge structures are highly influenced by their geometric properties. This paper aims at studying the impact of substructure irregularity on the seismic vulnerability of multicolumn-bent short-span bridges by estimating the capacity of bridge components. For this purpose, incremental dynamic analyses have been performed on two five-span bridge configurations, chosen according to a real case study. The studied bridges present supported on seat-type abutments and differ according to pier heights: regular and irregular substructures with equal and different heights, respectively, have been considered. Pounding of the bridge superstructure portion and nonlinear backfill soil behavior are accounted for in nonlinear time history analyses. Spectral acceleration of the first fundamental period and peak ground velocity are considered as intensity measures, while failure criteria consisted on maximum columns drift ratio and deck unseating at abutments. The performed analyses revealed a response of the irregular bridge significantly worser than the regular one. Besides, the two failure criteria affect the seismic vulnerability of the regular bridge almost equally and for the irregular bridge, column damage is always recognized to be the main reason of the structural collapse.
Effect of Substructure Irregularity on the Seismic Vulnerability of Short-Span Bridges
https://orcid.org/http://orcid.org/0000-0003-2415-0858
https://orcid.org/http://orcid.org/0000-0002-0451-9534
https://orcid.org/http://orcid.org/0000-0002-1476-5763
https://orcid.org/http://orcid.org/0000-0001-7413-6769
Seismic performance and dynamic characteristics of bridge structures are highly influenced by their geometric properties. This paper aims at studying the impact of substructure irregularity on the seismic vulnerability of multicolumn-bent short-span bridges by estimating the capacity of bridge components. For this purpose, incremental dynamic analyses have been performed on two five-span bridge configurations, chosen according to a real case study. The studied bridges present supported on seat-type abutments and differ according to pier heights: regular and irregular substructures with equal and different heights, respectively, have been considered. Pounding of the bridge superstructure portion and nonlinear backfill soil behavior are accounted for in nonlinear time history analyses. Spectral acceleration of the first fundamental period and peak ground velocity are considered as intensity measures, while failure criteria consisted on maximum columns drift ratio and deck unseating at abutments. The performed analyses revealed a response of the irregular bridge significantly worser than the regular one. Besides, the two failure criteria affect the seismic vulnerability of the regular bridge almost equally and for the irregular bridge, column damage is always recognized to be the main reason of the structural collapse.
Effect of Substructure Irregularity on the Seismic Vulnerability of Short-Span Bridges
Lecture Notes in Civil Engineering
Pellegrino, Carlo (Herausgeber:in) / Faleschini, Flora (Herausgeber:in) / Zanini, Mariano Angelo (Herausgeber:in) / Matos, José C. (Herausgeber:in) / Casas, Joan R. (Herausgeber:in) / Strauss, Alfred (Herausgeber:in) / Heydarpour, Khashayar (Autor:in) / Bencivenga, Pasquale (Autor:in) / Hadi, Monsef Ahmadi (Autor:in) / Zizi, Mattia (Autor:in)
International Conference of the European Association on Quality Control of Bridges and Structures ; 2021 ; Padua, Italy
12.12.2021
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Short-span bridge , Substructure irregularity , Seismic vulnerability , Incremental Dynamic Analysis , Fragility analysis Engineering , Building Construction and Design , Engineering Economics, Organization, Logistics, Marketing , Risk Management , Fire Science, Hazard Control, Building Safety , Building Materials
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