A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges
Irregularities in bridge pier stiffness concentrate the ductility demand on short piers; while not operating on the longer and more flexible ones. The existence of non-uniform, ductility demand distribution in bridges significantly influences seismic response. As such, this paper proposes a new appr...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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University of Tehran Press
2018-06-01
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| Series: | Civil Engineering Infrastructures Journal |
| Subjects: | |
| Online Access: | https://ceij.ut.ac.ir/article_66131_abe5591336011b4ecb5f79ab42b1b22f.pdf |
| _version_ | 1811241757164175360 |
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| author | Dr. Mehdi Ghassemieh Seyed Mohyedin Ghodratian Mohammad Khanmohmmadi Mahmoud Baei |
| author_facet | Dr. Mehdi Ghassemieh Seyed Mohyedin Ghodratian Mohammad Khanmohmmadi Mahmoud Baei |
| author_sort | Dr. Mehdi Ghassemieh |
| collection | DOAJ |
| description | Irregularities in bridge pier stiffness concentrate the ductility demand on short piers; while not operating on the longer and more flexible ones. The existence of non-uniform, ductility demand distribution in bridges significantly influences seismic response. As such, this paper proposes a new approach for balancing the ductility demand in irregular bridges by utilizing shape memory alloys (SMAs). An irregular, single column bent viaduct with unequal pier heights is modeled and used as a reference bridge. To enhance seismic behavior of the bridge, a fixed bearing at the top of the short pier is replaced by a sliding bearing and two groups of SMA bars. SMAs are designed to keep their maximum strain within the super-elastic range. The seismic response of the controlled bridge is compared with a reference bridge through parametric studies using a set of suitable ground motion records. Study parameters include SMA lengths, short pier reinforcement ratios, design strain of SMA elements, and the heights of the medium and long piers. The proposed method successfully reduced the response of the short pier and, hence, improved the overall seismic behavior. |
| first_indexed | 2024-04-12T13:40:56Z |
| format | Article |
| id | doaj.art-2ee06d05719f4d6f8c5a0edb82232ac6 |
| institution | Directory Open Access Journal |
| issn | 2322-2093 2423-6691 |
| language | English |
| last_indexed | 2024-04-12T13:40:56Z |
| publishDate | 2018-06-01 |
| publisher | University of Tehran Press |
| record_format | Article |
| series | Civil Engineering Infrastructures Journal |
| spelling | doaj.art-2ee06d05719f4d6f8c5a0edb82232ac62022-12-22T03:30:51ZengUniversity of Tehran PressCivil Engineering Infrastructures Journal2322-20932423-66912018-06-0151114716810.7508/ceij.2018.01.00966131A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular BridgesDr. Mehdi Ghassemieh0Seyed Mohyedin Ghodratian1Mohammad Khanmohmmadi2Mahmoud Baei3Department of Civil Engineering, Bu-Ali Sina University, fahmideh st, 65178-38695 Hamedan, IranSchool of civil engineering, Sharif UniversitySchool of Civil Engineering, University of TehranSchool of Civil Engineering, University of TehranIrregularities in bridge pier stiffness concentrate the ductility demand on short piers; while not operating on the longer and more flexible ones. The existence of non-uniform, ductility demand distribution in bridges significantly influences seismic response. As such, this paper proposes a new approach for balancing the ductility demand in irregular bridges by utilizing shape memory alloys (SMAs). An irregular, single column bent viaduct with unequal pier heights is modeled and used as a reference bridge. To enhance seismic behavior of the bridge, a fixed bearing at the top of the short pier is replaced by a sliding bearing and two groups of SMA bars. SMAs are designed to keep their maximum strain within the super-elastic range. The seismic response of the controlled bridge is compared with a reference bridge through parametric studies using a set of suitable ground motion records. Study parameters include SMA lengths, short pier reinforcement ratios, design strain of SMA elements, and the heights of the medium and long piers. The proposed method successfully reduced the response of the short pier and, hence, improved the overall seismic behavior.https://ceij.ut.ac.ir/article_66131_abe5591336011b4ecb5f79ab42b1b22f.pdfbridgeductility demandenergy dissipationirregularityseismic responseshape memory alloy (sma) |
| spellingShingle | Dr. Mehdi Ghassemieh Seyed Mohyedin Ghodratian Mohammad Khanmohmmadi Mahmoud Baei A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges Civil Engineering Infrastructures Journal bridge ductility demand energy dissipation irregularity seismic response shape memory alloy (sma) |
| title | A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges |
| title_full | A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges |
| title_fullStr | A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges |
| title_full_unstemmed | A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges |
| title_short | A Superelastic Retrofitting Method for Mitigating the Effects of Seismic Excitations on Irregular Bridges |
| title_sort | superelastic retrofitting method for mitigating the effects of seismic excitations on irregular bridges |
| topic | bridge ductility demand energy dissipation irregularity seismic response shape memory alloy (sma) |
| url | https://ceij.ut.ac.ir/article_66131_abe5591336011b4ecb5f79ab42b1b22f.pdf |
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