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The Effect of Single and Bimodulus Material Behavior on Longitudinal Compression Failure of Bamboo Culms Under Flexure
The use of bamboo as a building material is growing rapidly due to its advantages over traditional building materials, such as steel and concrete. Bamboo is lightweight, strong, rapidly renewable, and environmentally friendly; therefore, it can constitute an excellent material for structures. Understanding the failure mechanisms of bamboo culms would allow a wider adoption of bamboo for structural purposes. Various failure mechanisms can occur in bamboo culms under flexure; a common failure mechanism is buckling because of longitudinal compression. Although bamboo culms have different compression and tension moduli (bimodulus behavior), previous studies mainly focused on standard bending theory, which assumes a single modulus (i.e., the “apparent” bending modulus). This study derives analytically the failure moment of a bamboo culm in flexure (for longitudinal compression-induced failure), investigating both single and bimodulus bending. The findings reveal that the bimodulus approach is more critical than the standard bending theory (single-modulus approach). Moreover, disregarding the shift of the neutral axis in the bimodulus approach leads to an error of less than 5% in the estimated failure moment, compared to the exact solution (which takes into account the shift of the neutral axis). Therefore, for the failure analysis of bamboo culms under flexure, and for failure by longitudinal compression, this study recommends the adoption of the bimodulus approach, with the simplification of ignoring the neutral axis shift.
The Effect of Single and Bimodulus Material Behavior on Longitudinal Compression Failure of Bamboo Culms Under Flexure
The use of bamboo as a building material is growing rapidly due to its advantages over traditional building materials, such as steel and concrete. Bamboo is lightweight, strong, rapidly renewable, and environmentally friendly; therefore, it can constitute an excellent material for structures. Understanding the failure mechanisms of bamboo culms would allow a wider adoption of bamboo for structural purposes. Various failure mechanisms can occur in bamboo culms under flexure; a common failure mechanism is buckling because of longitudinal compression. Although bamboo culms have different compression and tension moduli (bimodulus behavior), previous studies mainly focused on standard bending theory, which assumes a single modulus (i.e., the “apparent” bending modulus). This study derives analytically the failure moment of a bamboo culm in flexure (for longitudinal compression-induced failure), investigating both single and bimodulus bending. The findings reveal that the bimodulus approach is more critical than the standard bending theory (single-modulus approach). Moreover, disregarding the shift of the neutral axis in the bimodulus approach leads to an error of less than 5% in the estimated failure moment, compared to the exact solution (which takes into account the shift of the neutral axis). Therefore, for the failure analysis of bamboo culms under flexure, and for failure by longitudinal compression, this study recommends the adoption of the bimodulus approach, with the simplification of ignoring the neutral axis shift.
The Effect of Single and Bimodulus Material Behavior on Longitudinal Compression Failure of Bamboo Culms Under Flexure
Lecture Notes in Civil Engineering
Chouw, Nawawi (editor) / Zhang, Chunwei (editor) / Khodabakhshi, Nahid (author) / Mouka, Theodora (author) / Dimitrakopoulos, Elias G. (author)
Australasian Conference on the Mechanics of Structures and Materials ; 2023 ; Auckland, New Zealand
Proceedings of the 26th Australasian Conference on the Mechanics of Structures and Materials ; Chapter: 17 ; 175-184
2024-09-03
10 pages
Article/Chapter (Book)
Electronic Resource
English
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