Mouka, Theodora;
Dimitrakopoulos, Elias G;
Lorenzo, Rodolfo;
(2022)
Effect of a longitudinal crack on the flexural performance of bamboo culms.
Acta Mechanica
, 233
pp. 3777-3793.
10.1007/s00707-022-03314-3.
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Abstract
Splitting parallel to the culm fibers is common in full-culm bamboo structural members, even early in a structure’s lifespan. Currently, there is insufficient knowledge on the effect of splitting on member performance, which induces significant uncertainties in bamboo member engineering design. This is a potential threat to the safety of existing and future full-culm bamboo structures. This study investigates analytically the effect of a longitudinal crack on the stiffness of an originally intact bamboo culm in flexure. The study develops analytical expressions that describe stiffness loss in two flexure cases (a three-point bending and a four-point bending test) and verifies them with available experimental results and numerical simulations. Main cause of the stiffness loss is torsion-induced deflections, with secondary cause being shear deformations. Importantly, stiffness loss solely depends on two dimensionless parameters: the shape factor (radius-to-thickness ratio) and a factor that is a function of material properties and ratio of shear span length to culm diameter. Additionally, the study proves analytically that friction at the load application points mitigates torsion-induced deflections. This has important implications for bamboo structure design and testing standards, indicating that the manner in which loads are transferred on beams affects the apparent beam stiffness when a crack appears.
Type: | Article |
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Title: | Effect of a longitudinal crack on the flexural performance of bamboo culms |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1007/s00707-022-03314-3 |
Publisher version: | https://doi.org/10.1007/s00707-022-03314-3 |
Language: | English |
Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Full-culm bamboo bending, Stiffness loss, Vlasov torsion, Warping, Longitudinal crack |
UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
URI: | https://discovery.ucl.ac.uk/id/eprint/10155288 |
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