[提要]  根据17根钢纤维混凝土强度等级为CF65～CF90的钢纤维高强混凝土无腹筋梁的受力性能试验结果，分析了钢纤维体积率变化对钢纤维高强混凝土梁裂缝分布形态及破坏特征的影响规律，验证了钢纤维对高强混凝土梁裂缝发生与发展的有效约束作用及对斜截面破坏形态的改善作用。经过统计分析，提出了钢纤维高强混凝土梁斜截面抗裂和斜截面承载力计算方法，供修订《纤维混凝土结构技术规程》参考。
[关键词]  结构工程  试验研究  钢纤维高强混凝土  梁

A test program has been performed to study the shear behaviors of the steel fiber reinforced high-strength concrete beams. Seventeen beams without stirrups were made of CF65 to CF90 concrete. Based on the test results,the effects of steel fiber on the occurrence and elongation of cracks, the crack states and the failure characteristics of reinforced high-strength concrete beams are analyzed. The methods are proposed for calculating the shear-cracking strength and the shear resistance of the beams.It can be used as a research basis for revising the contents of the Technical Specification for Fiber Rein forced Con:crete Structures.
Keywords:  structure engineering; experimental study; steel fiber reinforced high-strength concrete; beam

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