基于分形理论的钢筋混凝土梁受剪试验研究  

Shear test of reinforced concrete beam based on fractal theory

作　　者：秦拥军[1] 王博[1] 赵志浩[1] 李向阳[1] QIN Yongjun;WANG Bo;ZHAO Zhihao;LI Xiangyang(School of Civil Engineering&Architecture,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047

出　　处：《混凝土》2022年第4期44-47,51,共5页Concrete

基　　金：国家自然科学基金资助项目(51668061,51668060)。

摘　　要：以配箍率和剪跨比为变量设计了5根钢筋混凝土梁受剪试验,以分形理论为基础,对梁受剪破坏过程中裂纹的分形维数演化特征进行分析,研究了裂纹分形维数与最大裂纹宽度、损伤变量之间的关系。结果表明:不同变量下,试验梁裂纹分形维数均随加载进程的进行而呈线性增大,其增长速率随着剪跨比的提高而加快,随着配箍率的增大而降低。受剪梁最大裂纹宽度随着分形维数的增大而不断增大,二者成指数函数关系。随着试验梁裂纹分形维数的增大,其损伤变量也在不断增大,构件损伤程度加剧。Based on fractal theory,through the shear test of 5 reinforced concrete beams,analyze the evolution characteristics of the fractal dimension of the crack during the shear broken of the beam,The relationship between the crack fractal dimension and the maximum crack width and damage variable is studied.The results show under different variables,the fractal dimension of test beam cracks increases linearly with the progress of loading.The maximum crack width of the shear beam increases with the increase of the fractal dimension,and the relationship between the two parts an exponential function.With the increase of the crack fractal dimension of the test beam,the damage variable is also increasing,the component damage is increased.

关 键 词：混凝土梁 受剪破坏 分形理论 剪跨比 箍筋配筋率 

分 类 号：TU528.571[建筑科学—建筑技术科学]