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Shear Strength Prediction of Deep CFFT Beams

Synopsis: Despite significant theoretical advances in the use of concrete-filled fiber reinforced polymer (FRP) tubes (CFFT), research on their shear behavior has been few and limited. Current method of shear analysis of CFFT beams relies on Bernoulli beam theory, which utilizes the basic assumption of linear strain distribution across the depth. Most recently, the use of modified compression field theory was suggested to improve the shear analysis of CFFT beams. The approach, however, is not applicable to the disturbed or D-regions of a beam, such as those in a deep CFFT beam. Therefore, this study adopted the strut-and-tie model to predict the shear strength of deep CFFT beams. The model is validated against test results for a CFFT beam with a shear-spanto-depth ratio of 1. A parametric study is then carried out to assess the shear criticality of CFFT beams. The study showed that shear failure would only be critical for beams with shear span less than their depth. High strength concrete was also found to improve capacity of CFFT beams. However, a judicious selection of concrete strength and fiber architecture with different proportions of shear and flexural capacities of the tube could help optimize the use of materials.