Behavior of bamboo reinforced self-compacting concrete: application of short span elements

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This study focused on the behavior of bamboo reinforced self-compacting concrete (BRSCC) beams and slabs under monotonic loading. Both BRSCC and Bamboo Reinforced Natural Concrete (BRNC) samples with varying percentages of bamboo (1.5 and 3% for beams and 1%, 2% and 3% for slabs) as longitudinal reinforcement were cast and tested to study shear and flexure failure mechanisms and the contribution of concrete and bamboo to their resistance. The beams were 100 mm wide and had different depths of 150 mm, 250 mm and 275 mm with lengths of 1050 mm, 1200 mm and 2000mm respectively and a span to depth ratio of 1.8. The slabs on the other hand had dimensions of 1000 x 300 x 80 mm and a shear span- to - depth ratio of 2.5. All the samples were simply supported and subjected to a four-point monotonic loading. During testing, the characteristics of the samples under loading such as deflection, cracking and failure were observed and recorded. The study established that for the same percentage longitudinal reinforcement and sectional properties, energy dissipation capacity of the structural components (beams and slabs) of BRSCC was higher than their BRNC counterparts. The average increase in the energy dissipation was 17% and 15% for slabs and beams respectively. In addition, the longitudinal reinforcement ratios greatly impacted the shear capacities and degree of ductility of the structural components. Though bamboo as a longitudinal reinforcement contributes to shear resistance, it is recommended that a code predictive equation that does not explicitly account for longitudinal shear resistance e.g. CSA be utilized when designing BRSCC structural components. BS, ACI, EC 2 and CSA overestimated the prediction of the flexural capacities of the slabs when a material factor of safety of 3 was used for the bamboo. Hence a reduction factor of 0.5 must be applied to code prediction when designing BRSCC slabs to ensure a high enough safety factor on ultimate strength.
A thesis submitted to the Department of Civil Engineering, College of Engineering in partial fulfillment of the requirements for the award of the degree of Master of Science Structural Engineering,