Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations
Historic Cairo has been a UNESCO World Heritage Site since 1979. It has more than 600 historic structures, which require extensive studies to sustain their cultural, religious, and economic values. The main aim of this paper is to undertake dynamic investigation tests for the dome of Fatima Khatun,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/1/192 |
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| author | Ahmad R. Bakkar Ahmed Elyamani Adel G. El-Attar Dan V. Bompa Ahmed Y. Elghazouli Sherif A. Mourad |
| author_facet | Ahmad R. Bakkar Ahmed Elyamani Adel G. El-Attar Dan V. Bompa Ahmed Y. Elghazouli Sherif A. Mourad |
| author_sort | Ahmad R. Bakkar |
| collection | DOAJ |
| description | Historic Cairo has been a UNESCO World Heritage Site since 1979. It has more than 600 historic structures, which require extensive studies to sustain their cultural, religious, and economic values. The main aim of this paper is to undertake dynamic investigation tests for the dome of Fatima Khatun, a historic mausoleum in Historic Cairo dating back to the 13th century and consisting of mainly bricks and stones. The challenge was that the structure was difficult to access, and only a small portion of the top was accessible for the attachment of accelerometers. Current dynamic identification procedures typically adopt methods in which the sensors are arranged at optimal locations and permit direct assessment of the natural frequencies, mode shapes, and damping ratios of a structure. Approaches that allow for the evaluation of dynamic response for structures with limited accessibility are lacking. To this end, in addition to in situ dynamic investigation tests, a numerical model was created based on available architectural, structural, and material documentation to obtain detailed insight into the dominant modes of vibration. The free vibration analysis of the numerical model identified the dynamic properties of the structure using reasonable assumptions on boundary conditions. System identification, which was carried out using in situ dynamic investigation tests and input from modelling, captured three experimental natural frequencies of the structure with their mode shapes and damping ratios. The approach proposed in this study informs and directs structural restoration for the mausoleum and can be used for other heritage structures located in congested historic sites. |
| first_indexed | 2024-03-09T13:19:05Z |
| format | Article |
| id | doaj.art-0e1d2b3ec9eb4fcb941c086c02da4ff7 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-09T13:19:05Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-0e1d2b3ec9eb4fcb941c086c02da4ff72023-11-30T21:31:10ZengMDPI AGBuildings2075-53092023-01-0113119210.3390/buildings13010192Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient VibrationsAhmad R. Bakkar0Ahmed Elyamani1Adel G. El-Attar2Dan V. Bompa3Ahmed Y. Elghazouli4Sherif A. Mourad5Department of Structural Engineering, Faculty of Engineering, Cairo University, Giza 12613, EgyptDepartment of Archaeological Conservation, Faculty of Archaeology, Cairo University, Giza 12613, EgyptDepartment of Structural Engineering, Faculty of Engineering, Cairo University, Giza 12613, EgyptSchool of Sustainability, Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UKDepartment of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UKDepartment of Structural Engineering, Faculty of Engineering, Cairo University, Giza 12613, EgyptHistoric Cairo has been a UNESCO World Heritage Site since 1979. It has more than 600 historic structures, which require extensive studies to sustain their cultural, religious, and economic values. The main aim of this paper is to undertake dynamic investigation tests for the dome of Fatima Khatun, a historic mausoleum in Historic Cairo dating back to the 13th century and consisting of mainly bricks and stones. The challenge was that the structure was difficult to access, and only a small portion of the top was accessible for the attachment of accelerometers. Current dynamic identification procedures typically adopt methods in which the sensors are arranged at optimal locations and permit direct assessment of the natural frequencies, mode shapes, and damping ratios of a structure. Approaches that allow for the evaluation of dynamic response for structures with limited accessibility are lacking. To this end, in addition to in situ dynamic investigation tests, a numerical model was created based on available architectural, structural, and material documentation to obtain detailed insight into the dominant modes of vibration. The free vibration analysis of the numerical model identified the dynamic properties of the structure using reasonable assumptions on boundary conditions. System identification, which was carried out using in situ dynamic investigation tests and input from modelling, captured three experimental natural frequencies of the structure with their mode shapes and damping ratios. The approach proposed in this study informs and directs structural restoration for the mausoleum and can be used for other heritage structures located in congested historic sites.https://www.mdpi.com/2075-5309/13/1/192dynamic propertiesexperimental modal analysisnatural frequency signal processingsystem identificationhistorical structures |
| spellingShingle | Ahmad R. Bakkar Ahmed Elyamani Adel G. El-Attar Dan V. Bompa Ahmed Y. Elghazouli Sherif A. Mourad Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations Buildings dynamic properties experimental modal analysis natural frequency signal processing system identification historical structures |
| title | Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations |
| title_full | Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations |
| title_fullStr | Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations |
| title_full_unstemmed | Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations |
| title_short | Dynamic Characterisation of a Heritage Structure with Limited Accessibility Using Ambient Vibrations |
| title_sort | dynamic characterisation of a heritage structure with limited accessibility using ambient vibrations |
| topic | dynamic properties experimental modal analysis natural frequency signal processing system identification historical structures |
| url | https://www.mdpi.com/2075-5309/13/1/192 |
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