Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load
Bending failure modes in solid stem wood and solid culm bamboo varies depending on material and geometric properties. Solid culm cross-sections of Oxythenantera Abyssinica round bamboo resemble to wood, but are anatomically different in their mode of growth and tissue organization. The bending stres...
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| Format: | Article |
| Language: | English |
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Sustainable Development Press Limited
2023-12-01
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| Series: | Sustainable Structures |
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| Online Access: | http://www.sustain-dpl.com/UploadFile/article/202305211025350359.pdf |
| _version_ | 1797518873382092800 |
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| author | Tadesse Mergiaw Denamo Addissie James Goedert |
| author_facet | Tadesse Mergiaw Denamo Addissie James Goedert |
| author_sort | Tadesse Mergiaw |
| collection | DOAJ |
| description | Bending failure modes in solid stem wood and solid culm bamboo varies depending on material and geometric properties. Solid culm cross-sections of Oxythenantera Abyssinica round bamboo resemble to wood, but are anatomically different in their mode of growth and tissue organization. The bending stress gradient and failure behavior has highly related with the culm internal voids termed as hollowness which depends on age of bamboo. Hollowness (k) refers the relative proportion of void volume to solid volume with in a culm. Full culm beam specimens with length of 3.5 m were subjected to bending under 4-point static loading according to ISO 22155. Pattern of vertical deflection varies depending on the maturity of the culm. A statistical and experimental results showed that, for K values between 12-15% a mixed mode of local buckling with a longitudinal shear splitting failure mode was resulted in 4-year age bamboo specimens with a slight (14 mm) shift from the shear center inducing large vertical deflection (142 mm) at midspan. A kink buckle and green stick modes were observed in 2-year and 3-year ages culms at failure point of 124 and 158mm at length ‘L’ (L/2.5 to L/4.5) from shear center with a k value 25-27% and 18-22% respectively. |
| first_indexed | 2024-03-10T07:35:29Z |
| format | Article |
| id | doaj.art-21f488a9b0564ccca190dfd545028fd7 |
| institution | Directory Open Access Journal |
| issn | 2789-3111 2789-312X |
| language | English |
| last_indexed | 2024-03-10T07:35:29Z |
| publishDate | 2023-12-01 |
| publisher | Sustainable Development Press Limited |
| record_format | Article |
| series | Sustainable Structures |
| spelling | doaj.art-21f488a9b0564ccca190dfd545028fd72023-11-22T13:28:45ZengSustainable Development Press LimitedSustainable Structures2789-31112789-312X2023-12-013210.54113/j.sust.2023.000029Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending LoadTadesse Mergiaw0Denamo Addissie1James Goedert2Faculty of Civil and Water Resource Engineering, Bahir Dar University, Bahir Dar Institute of Technology, Bahir Dar, EthiopiaEthiopian Institute of Architecture Building Construction and City Development (EIABC), Addis Ababa University, Addis AbabaThe Durham School of Construction Engineering and Architecture, University of Nebraska Lincoln. Omaha, USABending failure modes in solid stem wood and solid culm bamboo varies depending on material and geometric properties. Solid culm cross-sections of Oxythenantera Abyssinica round bamboo resemble to wood, but are anatomically different in their mode of growth and tissue organization. The bending stress gradient and failure behavior has highly related with the culm internal voids termed as hollowness which depends on age of bamboo. Hollowness (k) refers the relative proportion of void volume to solid volume with in a culm. Full culm beam specimens with length of 3.5 m were subjected to bending under 4-point static loading according to ISO 22155. Pattern of vertical deflection varies depending on the maturity of the culm. A statistical and experimental results showed that, for K values between 12-15% a mixed mode of local buckling with a longitudinal shear splitting failure mode was resulted in 4-year age bamboo specimens with a slight (14 mm) shift from the shear center inducing large vertical deflection (142 mm) at midspan. A kink buckle and green stick modes were observed in 2-year and 3-year ages culms at failure point of 124 and 158mm at length ‘L’ (L/2.5 to L/4.5) from shear center with a k value 25-27% and 18-22% respectively.http://www.sustain-dpl.com/UploadFile/article/202305211025350359.pdfhollowness ratiofailure behaviorfailure locationbending stresslongitudinal shearshear center |
| spellingShingle | Tadesse Mergiaw Denamo Addissie James Goedert Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load Sustainable Structures hollowness ratio failure behavior failure location bending stress longitudinal shear shear center |
| title | Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load |
| title_full | Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load |
| title_fullStr | Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load |
| title_full_unstemmed | Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load |
| title_short | Failure Behavior and Failure Locations of Oxytenanthera Abyssinica Bamboo Culms under Bending Load |
| title_sort | failure behavior and failure locations of oxytenanthera abyssinica bamboo culms under bending load |
| topic | hollowness ratio failure behavior failure location bending stress longitudinal shear shear center |
| url | http://www.sustain-dpl.com/UploadFile/article/202305211025350359.pdf |
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