Experimental analysis of the efficiency of steel fibers on shear strength of beams

Abstract The efficiency of steel fibers for shear strength of reinforced concrete beams is assessed. Four beams were evaluated: control consisted of one beam without any steel fibers and three beams with reinforced concrete with steel fibers. All beams were reinforced for shear strength by a minimum reinforcement rate. The influence of fiber content added to concrete, at 0.5%, 0.8% and 1.0%, and the possibility of partial or total replacement of conventional shear reinforcement (stirrups) by steel fibers were evaluated. Results showed a significant increase in ductility and stiffness of the beams with steel fibers and, consequently, changes in the failure mode were observed, of shear (control beam) to flexure behavior (beams with steel fibers).

摘要 本研究评估了钢纤维对钢筋混凝土梁抗剪强度的增强效能。共测试四根试验梁：1根为未掺加钢纤维的对照组梁，其余3根为掺加钢纤维的钢筋混凝土梁。所有试验梁均按最低配箍率配置抗剪钢筋。研究考察了混凝土中钢纤维掺量（分别为0.5%、0.8%及1.0%）对梁抗剪性能的影响，同时验证了采用钢纤维部分或完全替代传统抗剪箍筋（stirrups）的可行性。试验结果表明：掺加钢纤维的梁其延性与刚度均得到显著提升，同时试验梁的破坏模式发生了明显转变——对照组梁呈现剪切破坏，而掺钢纤维梁则呈现弯曲受力破坏特征。