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

作　　者：孙文昊[1,3] 安风娇 谢俊 陈俊伟[1,3] SUN Wenhao;AN Fengjiao;XIE Jun;CHEN Junwei(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;National-Local Jonit Engineering Research Center of Underwater Tunnelling Technology,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [3]水下隧道技术国家与地方联合工程研究中心,湖北武汉430063

出　　处：《混凝土》2023年第12期35-38,43,共5页Concrete

基　　金：国家自然科学基金面上项目(51578109)。

摘　　要：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.

关 键 词：数字图像相关技术 应力-应变全曲线 残余抗压强度 应变云图 

分 类 号：TU528.571[建筑科学—建筑技术科学]