Mechanical Behaviour of Ultra-high-Performance Short Fibre Reinforced Concrete Beams Reinforced With Internal FRP Bars

摘要

The main objective of the research project reported in this paper is to develop a new type of high performance lightweight beams that combine FRP rebars cast in a ultra-high-performance concrete with short fibre reinforcement (UHPC-SFR) to have better performance than beams constructed using traditional materials (timber, steel, or RC beams). The hybrid beam has a high compressive and tensile capacity to sustain high bending moments and high shear loads. The hybrid beam, thus obtained, possesses a lower bending stiffness than a glulam timber beam or steel beam of similar overall dimensions, but a higher ultimate load capacity. One model developed to validate this concept is presented in this paper. It is an analytical model based on the usual force equilibrium hypotheses. The load-displacement and moment-curvature relationships are compared to experimental results obtained from 5 large-scale beams. The results show good correlation between analytical and experimental results, and illustrate the potential use of such hybrid beams for civil engineering structures.