Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion
Past research has revealed that a Variable Frequency Pendulum Isolator (VFPI) effectively controls the structural responses such as base shear and structural acceleration under far and near fault earthquakes and the VFPI may show excessive sliding displacement under some earthquakes having 4-6 s tim...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Electronic Journals for Science and Engineering - International
2022-08-01
|
| Series: | Electronic Journal of Structural Engineering |
| Subjects: | |
| Online Access: | https://ejsei.com/EJSE/article/view/298 |
| _version_ | 1827856862966448128 |
|---|---|
| author | Harshal Admane Pranesh Murnal |
| author_facet | Harshal Admane Pranesh Murnal |
| author_sort | Harshal Admane |
| collection | DOAJ |
| description | Past research has revealed that a Variable Frequency Pendulum Isolator (VFPI) effectively controls the structural responses such as base shear and structural acceleration under far and near fault earthquakes and the VFPI may show excessive sliding displacement under some earthquakes having 4-6 s time-period long waves. But, the impact of the amplitude of the long period wave on the sliding displacement of VFPI is missing in past research due to difficulty in finding out the amplitude of long period wave of an earthquake. Therefore, the present study considered the amplitude of the long period wave of an earthquake to analyse the behaviour of the structure isolated by VFPI. For this, the most dangerous long period wave of earthquakes has been extracted in the form of noise free wavelets by using Mavroeidis and Papageorgiou proposed numerical approach. The results indicate that the noise free long period wavelet effectively represent the low frequency earthquake for the structure isolated by VFPI. It is also found out that, the VFPI shows the excessive sliding displacement for only those earthquakes which contains peak ground displacement of long period wave more than 0.40 m. The variation in the base shear and structural acceleration of structure isolated by VFPI under various value of Frequency Variation Factor (FVF) obey the exponential and cubic form respectively. According to this, the present research provides empirical formulas, chart, and tables to predict the structural and isolator responses by using the peak ground velocity (PGV) and dominating low frequency (fd) of a near fault earthquake. |
| first_indexed | 2024-03-12T12:32:04Z |
| format | Article |
| id | doaj.art-b63d74c5f0a1431d984b2b86e5c4aed8 |
| institution | Directory Open Access Journal |
| issn | 1443-9255 |
| language | English |
| last_indexed | 2024-03-12T12:32:04Z |
| publishDate | 2022-08-01 |
| publisher | Electronic Journals for Science and Engineering - International |
| record_format | Article |
| series | Electronic Journal of Structural Engineering |
| spelling | doaj.art-b63d74c5f0a1431d984b2b86e5c4aed82023-08-29T10:17:29ZengElectronic Journals for Science and Engineering - InternationalElectronic Journal of Structural Engineering1443-92552022-08-01222536710.56748/ejse.222982300Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground MotionHarshal Admane0https://orcid.org/0000-0001-6980-7679Pranesh Murnal1Research ScholarProfessorPast research has revealed that a Variable Frequency Pendulum Isolator (VFPI) effectively controls the structural responses such as base shear and structural acceleration under far and near fault earthquakes and the VFPI may show excessive sliding displacement under some earthquakes having 4-6 s time-period long waves. But, the impact of the amplitude of the long period wave on the sliding displacement of VFPI is missing in past research due to difficulty in finding out the amplitude of long period wave of an earthquake. Therefore, the present study considered the amplitude of the long period wave of an earthquake to analyse the behaviour of the structure isolated by VFPI. For this, the most dangerous long period wave of earthquakes has been extracted in the form of noise free wavelets by using Mavroeidis and Papageorgiou proposed numerical approach. The results indicate that the noise free long period wavelet effectively represent the low frequency earthquake for the structure isolated by VFPI. It is also found out that, the VFPI shows the excessive sliding displacement for only those earthquakes which contains peak ground displacement of long period wave more than 0.40 m. The variation in the base shear and structural acceleration of structure isolated by VFPI under various value of Frequency Variation Factor (FVF) obey the exponential and cubic form respectively. According to this, the present research provides empirical formulas, chart, and tables to predict the structural and isolator responses by using the peak ground velocity (PGV) and dominating low frequency (fd) of a near fault earthquake.https://ejsei.com/EJSE/article/view/298waveletvfpivariable curvatureprediction of responsesnear-fault ground motionslow frequency ground motions |
| spellingShingle | Harshal Admane Pranesh Murnal Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion Electronic Journal of Structural Engineering wavelet vfpi variable curvature prediction of responses near-fault ground motions low frequency ground motions |
| title | Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion |
| title_full | Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion |
| title_fullStr | Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion |
| title_full_unstemmed | Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion |
| title_short | Response Prediction of VFPI Through Equivalent Long Period Wavelet of Near-Fault Ground Motion |
| title_sort | response prediction of vfpi through equivalent long period wavelet of near fault ground motion |
| topic | wavelet vfpi variable curvature prediction of responses near-fault ground motions low frequency ground motions |
| url | https://ejsei.com/EJSE/article/view/298 |
| work_keys_str_mv | AT harshaladmane responsepredictionofvfpithroughequivalentlongperiodwaveletofnearfaultgroundmotion AT praneshmurnal responsepredictionofvfpithroughequivalentlongperiodwaveletofnearfaultgroundmotion |