Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load
In this paper, the influence of soil-structure interaction (SSI) on a torsionally coupled turbo-generator (TG) machine foundation is studied under earthquake ground motions. The beneficial effects of base isolators in the TG foundation under earthquake ground motions are also studied duly, consideri...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/6686646 |
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| author | Karmegam Rajkumar Ramanathan Ayothiraman Vasant A. Matsagar |
| author_facet | Karmegam Rajkumar Ramanathan Ayothiraman Vasant A. Matsagar |
| author_sort | Karmegam Rajkumar |
| collection | DOAJ |
| description | In this paper, the influence of soil-structure interaction (SSI) on a torsionally coupled turbo-generator (TG) machine foundation is studied under earthquake ground motions. The beneficial effects of base isolators in the TG foundation under earthquake ground motions are also studied duly, considering the effects of SSI. A typical TG foundation is analyzed using a three-dimensional finite element (FE) model. Two superstructure eccentricity ratios are considered to represent the torsional coupling. Soft soil properties are considered to study the effects of SSI. This research concludes that the effects of torsional coupling alter the natural frequencies, if ignored, could lead to unsafe design. The deck accelerations and displacements are increased with an increase in superstructure eccentricity. On the other hand, the deck accelerations and displacements are greatly reduced with the help of base isolators, thus confirming the beneficial use of base isolators in machine foundations to protect the sensitive equipment from the strong earthquake ground motions. However, the effects of SSI reduce the natural frequencies of the TG foundation resting on soft soil conditions and activate the higher mode participation, resulting in amplifying the response. |
| format | Article |
| id | doaj-art-78a81dd5907d41f6b3d55d824e95c597 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-78a81dd5907d41f6b3d55d824e95c5972025-02-03T06:07:38ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/66866466686646Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake LoadKarmegam Rajkumar0Ramanathan Ayothiraman1Vasant A. Matsagar2Department of Civil Engineering, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi 110 016, IndiaDepartment of Civil Engineering, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi 110 016, IndiaDepartment of Civil Engineering, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi 110 016, IndiaIn this paper, the influence of soil-structure interaction (SSI) on a torsionally coupled turbo-generator (TG) machine foundation is studied under earthquake ground motions. The beneficial effects of base isolators in the TG foundation under earthquake ground motions are also studied duly, considering the effects of SSI. A typical TG foundation is analyzed using a three-dimensional finite element (FE) model. Two superstructure eccentricity ratios are considered to represent the torsional coupling. Soft soil properties are considered to study the effects of SSI. This research concludes that the effects of torsional coupling alter the natural frequencies, if ignored, could lead to unsafe design. The deck accelerations and displacements are increased with an increase in superstructure eccentricity. On the other hand, the deck accelerations and displacements are greatly reduced with the help of base isolators, thus confirming the beneficial use of base isolators in machine foundations to protect the sensitive equipment from the strong earthquake ground motions. However, the effects of SSI reduce the natural frequencies of the TG foundation resting on soft soil conditions and activate the higher mode participation, resulting in amplifying the response.http://dx.doi.org/10.1155/2021/6686646 |
| spellingShingle | Karmegam Rajkumar Ramanathan Ayothiraman Vasant A. Matsagar Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load Shock and Vibration |
| title | Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load |
| title_full | Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load |
| title_fullStr | Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load |
| title_full_unstemmed | Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load |
| title_short | Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load |
| title_sort | effects of soil structure interaction on torsionally coupled base isolated machine foundation under earthquake load |
| url | http://dx.doi.org/10.1155/2021/6686646 |
| work_keys_str_mv | AT karmegamrajkumar effectsofsoilstructureinteractionontorsionallycoupledbaseisolatedmachinefoundationunderearthquakeload AT ramanathanayothiraman effectsofsoilstructureinteractionontorsionallycoupledbaseisolatedmachinefoundationunderearthquakeload AT vasantamatsagar effectsofsoilstructureinteractionontorsionallycoupledbaseisolatedmachinefoundationunderearthquakeload |