Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records
Seismic isolation is a powerful tool for mitigating seismic risk and improving structural performance. However, some parameters, such as earthquake inputs and soil characteristics, influence the technology’s performance. This research aims to investigate the effects of soil–structure interaction (SS...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | CivilEng |
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| Online Access: | https://www.mdpi.com/2673-4109/4/3/40 |
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| author | Nastaran Cheshmehkaboodi Lotfi Guizani Noureddine Ghlamallah |
| author_facet | Nastaran Cheshmehkaboodi Lotfi Guizani Noureddine Ghlamallah |
| author_sort | Nastaran Cheshmehkaboodi |
| collection | DOAJ |
| description | Seismic isolation is a powerful tool for mitigating seismic risk and improving structural performance. However, some parameters, such as earthquake inputs and soil characteristics, influence the technology’s performance. This research aims to investigate the effects of soil–structure interaction (SSI) with regard to different moderate earthquakes associated with different distances of the source to the site, frequency content, and different soil characteristics on the seismic response of the isolated bridges. Near-fault (NF) and far-field (FF) records are applied to the conventional and isolated bridge with and without considering the underlying soil. For this reason, using the direct and simplified methods, three soil properties representing rock, dense, and stiff soils are modeled in Abaqus software. Nonlinear time history analysis (NLTHA) is carried out, and structural responses of both approaches in terms of maximum deck acceleration, base shear, and displacement of the deck and the isolation system are studied. Results demonstrate that the difference between the two approaches is significant. Using the simplified method is a rather simple approach that roughly captures the important features of the record characteristics and SSI. Furthermore, careful attention should be paid to the base shear responses and the isolator displacement demands, as they are significantly amplified in softer soils. In addition, the peak ground acceleration to peak ground velocity ratio (PGA/PGV) plays a decisive role in all dynamic responses. Records with a lower PGA/PGV ratio cause higher dynamic responses in terms of displacement and acceleration/force, regardless of the distance of the ruptured fault, while NF records show higher dynamic responses compared to FF records. |
| first_indexed | 2024-03-10T22:55:51Z |
| format | Article |
| id | doaj.art-fd72253349154841865367b5cef734ab |
| institution | Directory Open Access Journal |
| issn | 2673-4109 |
| language | English |
| last_indexed | 2024-03-10T22:55:51Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | CivilEng |
| spelling | doaj.art-fd72253349154841865367b5cef734ab2023-11-19T10:05:15ZengMDPI AGCivilEng2673-41092023-06-014370272510.3390/civileng4030040Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field RecordsNastaran Cheshmehkaboodi0Lotfi Guizani1Noureddine Ghlamallah2École de Technologie Supérieure, Montréal, QC H3C 1K3, CanadaÉcole de Technologie Supérieure, Montréal, QC H3C 1K3, CanadaEnglobe Engineering, Montréal, QC H1B 5X7, CanadaSeismic isolation is a powerful tool for mitigating seismic risk and improving structural performance. However, some parameters, such as earthquake inputs and soil characteristics, influence the technology’s performance. This research aims to investigate the effects of soil–structure interaction (SSI) with regard to different moderate earthquakes associated with different distances of the source to the site, frequency content, and different soil characteristics on the seismic response of the isolated bridges. Near-fault (NF) and far-field (FF) records are applied to the conventional and isolated bridge with and without considering the underlying soil. For this reason, using the direct and simplified methods, three soil properties representing rock, dense, and stiff soils are modeled in Abaqus software. Nonlinear time history analysis (NLTHA) is carried out, and structural responses of both approaches in terms of maximum deck acceleration, base shear, and displacement of the deck and the isolation system are studied. Results demonstrate that the difference between the two approaches is significant. Using the simplified method is a rather simple approach that roughly captures the important features of the record characteristics and SSI. Furthermore, careful attention should be paid to the base shear responses and the isolator displacement demands, as they are significantly amplified in softer soils. In addition, the peak ground acceleration to peak ground velocity ratio (PGA/PGV) plays a decisive role in all dynamic responses. Records with a lower PGA/PGV ratio cause higher dynamic responses in terms of displacement and acceleration/force, regardless of the distance of the ruptured fault, while NF records show higher dynamic responses compared to FF records.https://www.mdpi.com/2673-4109/4/3/40seismic isolationearthquake characteristicssoil–structure interaction effectsnear-faultfar-fieldbridges |
| spellingShingle | Nastaran Cheshmehkaboodi Lotfi Guizani Noureddine Ghlamallah Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records CivilEng seismic isolation earthquake characteristics soil–structure interaction effects near-fault far-field bridges |
| title | Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records |
| title_full | Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records |
| title_fullStr | Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records |
| title_full_unstemmed | Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records |
| title_short | Soil–Structure Interaction Effects on Seismic Responses of a Conventional and Isolated Bridge Subjected to Moderate Near-Fault and Far-Field Records |
| title_sort | soil structure interaction effects on seismic responses of a conventional and isolated bridge subjected to moderate near fault and far field records |
| topic | seismic isolation earthquake characteristics soil–structure interaction effects near-fault far-field bridges |
| url | https://www.mdpi.com/2673-4109/4/3/40 |
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