基于DIC技术分析钢纤维对混凝土轴压性能的影响

Study of steel fiber effect on the axial compression property of concrete based on DIC method

为了分析不同掺量钢纤维对混凝土单轴受压性能的影响,进行了不同掺量钢纤维混凝土单轴受压纵向、横向和体积应力-应变全曲线的测试,并利用数字图像相关技术研究了单轴受压破坏过程中试件表面的应变变化。试验结果表明:钢纤维的加入可以改变试件单轴受压过程中的应变分布;随着钢纤维掺量的增加,钢纤维桥接裂缝两侧应力的能力增加,混凝土试件的残余抗压强度增大;相比试件Y方向的应变云图,X方向的应变云图能更准确表征试件裂缝的开展趋势。

In order to analyze the influence of different content of steel fiber on the axial compression performance of concrete,the longitudinal,transverse and volumetric stress-strain curves of different content of steel fiber reinforced concrete under uniaxial compression were tested,and the strain change of specimen surface during uniaxial compression failure was studied by using digital image correlation technology.The test results show that the addition of steel fiber can change the strain distribution of the specimen during uniaxial compression.With the increase of steel fiber content,the ability of steel fiber to bridge the stress on both sides of the crack increases,and the residual compressive strength of concrete prism increases.Compared with the strain nephogram in the Y-direction of the specimen,the strain nephogram in the X-direction can more accurately characterize the crack development of the specimen.