The need for establishing the contribution of pultruded FRP encasements and additional FRP wraps around these
encasements to the shear strength and load-deflection behavior of reinforced concrete beams is the main motivation of the
present study. This paper primarily focuses on the effect of additional wrapping around the composite beam on the flexural and
shear behavior of the pultruded GFRP (Glass Fiber Reinforced Polymer) beams infilled with reinforced concrete, taking into
account different types of failure according to av/H ratio (arch action, shear-tension, shear-compression and pure bending). For
this purpose, nine hybrid beams with variable shear span-to-depth ratio (av/H) were tested. Hybrid beams with 500 mm, 1000
mm, and 1500 mm lengths and cross-sections of 150x100 mm and 100x100 mm were tested under three-point and four-point
loading. Based on the testing load-displacement relationship, ductility ratio, energy dissipation capacity of the beams were
evaluated with comprehensive macro damage analysis on pultruded GFRP profile and GFRP wrapping. The GFRP wraps were
established to have a major contribution to the composite beam ductility (90-125%) and strength (40-75%) in all ranges of beam
behavior (shear-dominated or dominated by the coupling of shear and flexure). The composite beams with wraps were showns
to reach ductilities and strength values of their counterparts with much greater beam depth.
