【摘要】 通过四点加载剪切试验和数字图像相关法对定向和随机乱向分布钢纤维水泥基复合材料的剪切过程进行测试分析,得到材料的剪切应变云图及荷载-位移曲线,结合纤维夹杂应力强度因子计算理论与剪切应力-应变曲线计算出试件在承载过程中的剪切起裂韧度和极限断裂韧度以评估钢纤维水泥基复合材料抗剪性能受纤维取向的影响。结果表明,定向较乱向分布钢纤维水泥基复合材料的剪切起裂韧度提高50%～100%,剪切极限断裂韧度提高30%～60%。定向分布钢纤维水泥基复合材料剪切破坏时,承载能力和抗剪韧性较高且表现为多缝开裂。更多还原

【Abstract】 Four-point loading shear test and digital image correlation are used to measure the shear process of steel fiber reinforced cementitious composites with aligned and random distribution.The shear strain cloud diagram and load-displacement curve are obtained.In order to study the effect of fiber orientation on shear properties of material, the shear initial and ultimate fracture toughness are calculated based on the calculation theory of fiber inclusion stress intensity factor and shear stress-strain curve.According to the results, the initial shear fracture toughness and fracture toughness of the aligned steel fiber cementitious composites are 50%～100% and 30%～60% higher than those with steel fiber cementitious composites.When shearing failure, the aligned steel fiber cementitious composite shows multi-slit cracking and has a higher bearing capacity and shear toughness.更多还原