基于DIC技术的变轴力钢筋混凝土足尺柱裂缝发展研究  

Research on crack development of full-scale reinforced concrete columns with variable axial force based on DIC technology

作　　者：樊爽 郭玉荣[1,2] FAN Shuang;GUO Yurong(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency,Ministry of Education,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《混凝土》2022年第3期69-74,共6页Concrete

基　　金：国家自然科学基金资助项目(51878259)。

摘　　要：为研究轴力变化对RC柱在往复加载作用下裂缝发展的影响,进行了一根定轴力足尺RC柱和一根变轴力足尺RC柱的水平和竖向双向往复加载拟静力试验。利用数字图像相关(Digital Image Correlation,DIC)技术分析两根柱子在往复加载过程中与加载方向垂直的柱根部混凝土表面的裂缝发展过程,研究两根柱子裂缝长度和宽度的变化规律及轴力变化对裂缝发展的影响。研究结果表明:DIC技术可对微裂缝的开裂点和裂缝发展过程进行识别;轴力变化导致裂缝分布呈现明显的不对称性,并抑制横向裂缝的开展和影响竖向裂缝的开裂点;受轴力变化影响,变轴力柱在相同位移下的裂缝宽度更大,且与轴力变化幅度有关,但对裂缝长度影响不大。In order to study the influence of axial force variation on crack development of RC column under reciprocating loading,the quasi-static tests of a full scale RC column with fixed axial force and a full scale RC column with variable axial force were carried out under horizontal and vertical reciprocating loading.Digital Image Correlation(DIC)technology was used to analyze the crack development process of concrete surface at the root of two columns perpendicular to the loading direction during the reciprocating loading process,and the variation law of crack length and width and the influence of axial force on crack development of two columns were studied.The results show that DIC technology can identify the cracking point and fracture development process of microfractures.The variation of axial force results in obvious asymmetry of fracture distribution and inhibits the development of transverse fractures and affects the cracking point of vertical fractures.Under the influence of axial force variation,the crack width of column with variable axial force is larger under the same displacement,and it is related to the amplitude of axial force variation,but has little influence on the crack length.

关 键 词：DIC技术 变轴力 拟静力试验 钢筋混凝土柱 裂缝 

分 类 号：TU528.571[建筑科学—建筑技术科学]