Influence of matrix ductility on shear behavior of high ductile fiber reinforced concrete beams

To study the influence of material ductility on beams without stirrups, 7 high ductile fiber reinforced concrete (HDC) and 2 reinforced concrete beams were designed, considering the tensile strength, length-diameter ratio, volume fraction of fiber and shear-span ratio as variable parameters. The mechanical behavior of 4 different mixture proportions HDC was tested, and the shear failure mode, bearing capacity and deformability were studied during the test of the monotonic loading on mid-span. It is concluded that: 1) 4 different mixture proportions HDC can meet different requirements of ductility, whose equivalent flexural toughnesscan be 50 times as high as mortar, and the ultimate tensile strain can be 90 times as high as mortar; 2) the shear capacity and deformability of HDC beams without stirrups is 2.36 and 3 times of those of RC beams respectively, whose shear-tensile failure mode has much better ductility; 3) except shear-span and longitudinal ratio, the shear capacity and deformability of HDC beams are increasing with material ductility, which should be considered in designing, and choose a corresponding material ductility according to actual needs in engineering. © 2018, Engineering Mechanics Press. All right reserved.