钢纤维高强钢筋混凝土梁剪切韧性试验研究

通过6根钢纤维高强钢筋高强混凝土梁及2根对比梁的斜截面受剪试验,研究钢纤维掺量和混凝土强度对高强钢筋混凝土梁剪切性能的影响。结合弯曲韧度指数确定方法和梁受剪破坏特点,以梁受剪试验荷载挠度曲线为基础,提出改进多特征点法计算剪切韧性指标,定量分析钢纤维掺量及混凝土强度对剪切韧性的影响。结果表明,改进多特征点法能够客观、全面地表达梁的剪切韧性。

Experimental Study on Shear Toughness of Steel Fiber High-strength Reinforced Concrete Beams

The shear capacity tests for six steel fiber high-strength reinforced concrete beams and two beams without steel fiber are taken to research the influences of the steel fiber contents and concrete strength on shear performance of the high-strength reinforced concrete beams. Based on the load-deflection curves of the beams, considering the determination method of bend toughness indexes and the beams failure features, the modified multi-feature points theory is put forward to calculate the shear toughness indexes and analyse the influences of the steel fiber content and concrete strength to shear toughness quantitatively. The results show the multi-feature points theory can express the shear toughness of the beams objectively and comprehensively.