Experiment on shear performance of different types of steel fiber UHPC beams without stirrups
The shear behavior of ultra-high-performance concrete(UHPC)beams without stirrups was investiga-ted through the single-point loading.Four UHPC beams with different steel fibers were tested until shear failure.The shear capacity,crack,deflection,and toughness were investigated in detail.The results show that the end-hook steel fiber has the better influence on the shear capacity,crack development and deformation,followed by smooth and straight steel fibers.The end-hook type Ⅱ steel fibers are better than end-hook type Ⅰ steel fibers.End-hook type Ⅰ steel fibers and smooth and straight steel fibers have better toughening effect,but share less longitudinal reinforcement tension.The wavy steel fibers share more longitudinal reinforcement tension.The wavy steel fibers improve the crack resistance of UHPC beams better without stirrups,but toughening effect is poorer.By comparison and analysis,the equation by Chen Xuan provides the best prediction accuracy.
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