Laboratory tests to understand tephra sliding behaviour on roofs
Abstract Following explosive eruptions, loading from tephra fall deposits can lead to roof collapse. However, the load may be reduced significantly by tephra sliding on pitched roofs. We present small-scale laboratory tests to investigate tephra sliding behaviour on metal, fibre cement sheet and til...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2023-11-01
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| Series: | Journal of Applied Volcanology |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13617-023-00137-2 |
| _version_ | 1797630433137000448 |
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| author | Sara Osman Mark Thomas Julia Crummy Anna Sharp Steve Carver |
| author_facet | Sara Osman Mark Thomas Julia Crummy Anna Sharp Steve Carver |
| author_sort | Sara Osman |
| collection | DOAJ |
| description | Abstract Following explosive eruptions, loading from tephra fall deposits can lead to roof collapse. However, the load may be reduced significantly by tephra sliding on pitched roofs. We present small-scale laboratory tests to investigate tephra sliding behaviour on metal, fibre cement sheet and tile roofing. We tested 10–30 cm thicknesses for dry and wet deposits of pumice, scoria and basaltic ash. We found that tephra did not slide on roof pitches ≤ 15° for coarse-grained deposits and ≤ 12° for dry ash. Thin deposits of wet ash were stable at pitches ≤ 30°. In addition, tephra was mainly shed on pitches ≥ 32° for metal roofs and ≥ 35° for fibre cement and tiles. Using these results, we have produced an initial set of sliding coefficients for tephra for simply pitched roofs that can be used to help prioritise roofs for clearing during an eruption and assist in designing roofs to withstand tephra fall. |
| first_indexed | 2024-03-11T11:08:10Z |
| format | Article |
| id | doaj.art-1de4c02c86f34c2e8ac79d1a48d5a2cb |
| institution | Directory Open Access Journal |
| issn | 2191-5040 |
| language | English |
| last_indexed | 2024-03-11T11:08:10Z |
| publishDate | 2023-11-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Applied Volcanology |
| spelling | doaj.art-1de4c02c86f34c2e8ac79d1a48d5a2cb2023-11-12T12:05:29ZengBMCJournal of Applied Volcanology2191-50402023-11-0112111610.1186/s13617-023-00137-2Laboratory tests to understand tephra sliding behaviour on roofsSara Osman0Mark Thomas1Julia Crummy2Anna Sharp3Steve Carver4School of Earth and Environment, University of LeedsSchool of Earth and Environment, University of LeedsBritish Geological Survey, The Lyell CentreSchool of Earth and Environment, University of LeedsSchool of Geography, University of LeedsAbstract Following explosive eruptions, loading from tephra fall deposits can lead to roof collapse. However, the load may be reduced significantly by tephra sliding on pitched roofs. We present small-scale laboratory tests to investigate tephra sliding behaviour on metal, fibre cement sheet and tile roofing. We tested 10–30 cm thicknesses for dry and wet deposits of pumice, scoria and basaltic ash. We found that tephra did not slide on roof pitches ≤ 15° for coarse-grained deposits and ≤ 12° for dry ash. Thin deposits of wet ash were stable at pitches ≤ 30°. In addition, tephra was mainly shed on pitches ≥ 32° for metal roofs and ≥ 35° for fibre cement and tiles. Using these results, we have produced an initial set of sliding coefficients for tephra for simply pitched roofs that can be used to help prioritise roofs for clearing during an eruption and assist in designing roofs to withstand tephra fall.https://doi.org/10.1186/s13617-023-00137-2Ash fallRoof loadingBuilding damageVolcanic hazardsEruption impacts |
| spellingShingle | Sara Osman Mark Thomas Julia Crummy Anna Sharp Steve Carver Laboratory tests to understand tephra sliding behaviour on roofs Journal of Applied Volcanology Ash fall Roof loading Building damage Volcanic hazards Eruption impacts |
| title | Laboratory tests to understand tephra sliding behaviour on roofs |
| title_full | Laboratory tests to understand tephra sliding behaviour on roofs |
| title_fullStr | Laboratory tests to understand tephra sliding behaviour on roofs |
| title_full_unstemmed | Laboratory tests to understand tephra sliding behaviour on roofs |
| title_short | Laboratory tests to understand tephra sliding behaviour on roofs |
| title_sort | laboratory tests to understand tephra sliding behaviour on roofs |
| topic | Ash fall Roof loading Building damage Volcanic hazards Eruption impacts |
| url | https://doi.org/10.1186/s13617-023-00137-2 |
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