Flexural properties of long straight,hooked end,and hybrid steel fiber ultra-high performance concrete(UHPC)with four different fiber contents were investigated by four-point bending tests of UHPC prisms.The results were compared to the tensile properties of UHPC obtained using an inverse analysis method.It was found that fiber type and content had a minimal impact on the elastic stage of UHPC prism flexural properties but significantly affected the post-crack stage.The hybrid fiber UHPC showed the most optimal reinforcement effect on the post-crack stage,with hybrid fibers exhibiting superior resistance compared to other fiber types.The cracking strength determined by the inverse analysis method was higher than the direct-tension equivalent cracking strength,with a ratio ranging from 1.03 to 1.19.
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