Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements
Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties through ambient excitation measurements of structures. However, it is difficult to obtain an accurate estimation of damping ratio directly from time-frequency decomposition of ambient v...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2015/173450 |
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| author | K. K. Wijesundara C. Negulescu E. Foerster |
| author_facet | K. K. Wijesundara C. Negulescu E. Foerster |
| author_sort | K. K. Wijesundara |
| collection | DOAJ |
| description | Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties through ambient excitation measurements of structures. However, it is difficult to obtain an accurate estimation of damping ratio directly from time-frequency decomposition of ambient vibration measurements using CWT. The main objective of this study is to introduce a new method called two-step procedure in the estimation of damping ratios using ambient vibration measurements. The two-step procedure involves the development of random decrement (RD) signature from the ambient vibration measurements, which is equivalent to the damped free vibration response of a structure under a given initial displacement and subsequently decomposition of time domain RD signature into time-frequency domain using CWT. The secondary objective of the study is to show that CWT is capable of identifying the natural periods and mode shapes of low-rise buildings using ambient vibration measurements. Furthermore, the two-step procedure is validated with two practical applications in a five-storey reinforced concrete structure with masonry infill walls and a three-storey masonry structure. Finally, a conclusion can be drawn that the two-step procedure yields a reasonably good estimation of damping ratio. |
| format | Article |
| id | doaj-art-84df2f72b17c4eac9d32025ff77a8c7d |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-84df2f72b17c4eac9d32025ff77a8c7d2025-02-03T01:23:17ZengWileyShock and Vibration1070-96221875-92032015-01-01201510.1155/2015/173450173450Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation MeasurementsK. K. Wijesundara0C. Negulescu1E. Foerster2Faculty of Engineering, University of Peradeniya, Peradeniya 20400, Sri LankaBRGM (French Geological Survey), Natural Risks Division, 3 Avenue Claude Guillemin, 45060 Orléans Cedex 2, FranceCEA Centre de Saclay, Bâtiment 603 Pièce 4, Point Courrier No 112, 91191 Gif-sur-Yvette Cedex, FranceContinuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties through ambient excitation measurements of structures. However, it is difficult to obtain an accurate estimation of damping ratio directly from time-frequency decomposition of ambient vibration measurements using CWT. The main objective of this study is to introduce a new method called two-step procedure in the estimation of damping ratios using ambient vibration measurements. The two-step procedure involves the development of random decrement (RD) signature from the ambient vibration measurements, which is equivalent to the damped free vibration response of a structure under a given initial displacement and subsequently decomposition of time domain RD signature into time-frequency domain using CWT. The secondary objective of the study is to show that CWT is capable of identifying the natural periods and mode shapes of low-rise buildings using ambient vibration measurements. Furthermore, the two-step procedure is validated with two practical applications in a five-storey reinforced concrete structure with masonry infill walls and a three-storey masonry structure. Finally, a conclusion can be drawn that the two-step procedure yields a reasonably good estimation of damping ratio.http://dx.doi.org/10.1155/2015/173450 |
| spellingShingle | K. K. Wijesundara C. Negulescu E. Foerster Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements Shock and Vibration |
| title | Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements |
| title_full | Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements |
| title_fullStr | Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements |
| title_full_unstemmed | Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements |
| title_short | Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements |
| title_sort | estimation of modal properties of low rise buildings using ambient excitation measurements |
| url | http://dx.doi.org/10.1155/2015/173450 |
| work_keys_str_mv | AT kkwijesundara estimationofmodalpropertiesoflowrisebuildingsusingambientexcitationmeasurements AT cnegulescu estimationofmodalpropertiesoflowrisebuildingsusingambientexcitationmeasurements AT efoerster estimationofmodalpropertiesoflowrisebuildingsusingambientexcitationmeasurements |