Tensile characterisation of bamboo strips for potential use in reinforced concrete members: experimental and numerical s
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ORIGINAL ARTICLE
Tensile characterisation of bamboo strips for potential use in reinforced concrete members: experimental and numerical study Bapi Mondal
. Damodar Maity . Puneet Kumar Patra
Received: 25 May 2020 / Accepted: 29 September 2020 Ó RILEM 2020
Abstract The usage of bamboo as a replacement for steel reinforcement in concrete is in the early stages of development as bamboo reinforced concrete (BRC) members involve a lot more uncertainties than steelreinforced concrete members. The properties of bamboo vary inter- and intra-species. A prerequisite to developing a rational design of BRC members, therefore, requires two stages—(i) a statistical characterisation of the mechanical properties of bamboo, and (ii) identifying the variables contributing significantly towards the stress-strain/load-displacement behaviour. This paper first experimentally characterizes the longitudinal tensile properties of Bambusa balcoa, a commonly found bamboo species in India. Statistical analysis of the experimental results suggests that most of the mechanical properties follow a lognormal distribution. The elastic modulus is found to have a dominant contribution towards the stressstrain behaviour. A high fidelity finite element model, the results of which are validated with experiments, indicates that only the variation of elastic modulus can capture 92% of the variability in the experimental B. Mondal (&) D. Maity P. K. Patra Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India e-mail: [email protected] D. Maity e-mail: [email protected] P. K. Patra e-mail: [email protected]
results. We also create a low-fidelity finite element model using equivalent tensile modulus, which can capture 82% of the variability in the experimental results. Lastly, a finite element model of a BRC beam is created using the low-fidelity finite element model of bamboo. A comparison with the experimental results suggests a good agreement between them. Keywords Bamboo Longitudinal tensile properties Experimental characterisation Finite element modelling
1 Introduction Concrete has become one of the most extensively used construction materials in the world. However, due to its low tensile strength and brittle nature, concrete requires tensile reinforcement, which is traditionally a steel rebar. Even though steel is the most compatible material in concrete, it has many disadvantages such as high cost, susceptibility to corrosion, heavy weight, and environmentally unfriendly. In order to provide a sustainable alternative to steel reinforcement, many researchers are working towards unconventional solutions. One promising such solution is bamboo. Bamboo is an optimized composite that exploits the concept of Functionally Graded Material (FGM). It has a unique structure which resembles that of a
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unidirectional fibre-reinforced composite with many nodes along its length. Since 1950s, several researches on bamboo as a reinforcing material in concrete have been
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