摘要
利用Φ100 mm分离式霍普金森压杆试验装置,对普通混凝土及钢纤维体积掺量为1. 0%的钢纤维混凝土在冲击荷载下的动态抗压强度、冲击韧度及裂纹分形维数值进行了研究。根据盒维数计算原理,设计一种基于Matlab的数字图像盒维数计算程序,建立简易盒维数算法。试验结果表明:冲击荷载下试件的动态抗压强度、冲击韧度都具有显著的加载速率强化效应,掺入钢纤维对混凝土的力学性能有大幅提高。冲击荷载下混凝土表面裂纹具有很好的分形特性,用分形维数对混凝土试件的动态抗压强度和冲击韧度进行定量描述,拟合了试件动态抗压强度、冲击韧度与其对应的分形维数的定量关系。研究成果为探索混凝土表面裂纹图形的分形特征与其承受的动态荷载之间的内在规律提供了一个新的度量角度。
Using theΦ100 mm split Hopkinson pressure bar test device,the dynamic compressive strength,impact toughness and crack fractal dimension of ordinary concrete and steel fiber reinforced concrete with 1.0%volume under impact load are studied.According to the calculation principle of box dimension,a digital image box dimension calculation program based on Matlab is designed to establish a simple box dimension algorithm.The test results show that the dynamic compressive strength and impact toughness of the specimen under impact load have significant loading rate strengthening effect,and the mechanical properties of concrete are greatly improved by the incorporation of steel fiber.The surface crack of concrete under impact load has distinct fractal characteristics.The dynamic compressive strength and impact toughness of concrete specimens are quantitatively described by fractal dimension,and the relationship between dynamic compressive strength,impact toughness and fractal dimensions are quantitatively matched.A new metric angle is provided for the exploration of the inherent law between the fractal features of concrete surface crack patterns and the dynamic load.
作者
李启帆
许金余
赵德辉
白二雷
刘志群
LI Qifan;XU Jinyu;ZHAO Dehui;BAI Erlei;LIU Zhiqun(Air Force Engineering University,Xi’an710038,China;Northwestern Polytechnical University,Xi’an710072,China)
出处
《防护工程》
2018年第6期11-15,共5页
Protective Engineering
关键词
分形
冲击荷载
钢纤维混凝土
裂纹
盒维数
动态抗压强度
冲击韧度
fractal
impact load
steel fiber reinforced concrete
crack
box dimension
dynamic compressive strength
impact toughness
作者简介
李启帆(1990—),男,博士研究生,主要从事防护工程相关材料的研究。
