钢纤维混凝土断裂过程激光实时全息干涉法研究  

Research on deformation and failure of steel fiber concrete by real-time laser holographic interferometry

作　　者：刘冬梅[1] 宋超业 陈志勇 

机构地区：[1]北京科技大学土木与环境工程学院 [2]中铁隧道勘测设计院有限公司,洛阳471009 [3]广东省重工建筑设计院,广州510030

出　　处：《岩土力学》2007年第9期1997-2002,共6页Rock and Soil Mechanics

摘　　要：应用激光实时全息干涉法实现了钢纤维混凝土三点弯曲切口梁断裂全过程的实时动态观测研究,连续动态捕获了钢纤维混凝土试件的干涉条纹图。实时全息干涉条纹的动态特征和分布规律直观准确地演示了钢纤维混凝土的初裂点和各阶段的变形特征以及裂缝扩展全过程。试验研究表明,当混凝土试件的钢纤维掺量大于1.0%时,钢纤维的阻裂增韧效应是明显的。钢纤维混凝土断裂力学参量的计算与分析显示,断裂能是反映钢纤维阻裂效应的敏感参数,用全息干涉条纹图的判识和用断裂能描述获得的试件断裂行为是一致的,激光实时全息干涉法能够为混凝土断裂力学研究提供可靠的试验支撑。Laser real-time holographic interferometry is applied to research the whole failure process of three-point bending beams of steel fiber concrete（SFC）.The real-time holograms of crack growth on SFC beams are continuously captured.According to the active fringe’s movement and distribution on the SFC specimens as well as the hologram’s interpretation,the initiation and development of crack in SFC and its deforming character can be exactly visually shown.The experiment indicates the effect of steel fiber preventing fracture and increasing toughness is obvious while the content of steel fiber in concrete specimens is higher than 1.0 %.Based on the calculation of fracture parameters and its analysis,It is clearly revealed that fracture energy is a sensitive parameters for reflecting the effect of steel fiber preventing fracture.The fracture behaviour of the SFC specimens demonstrated by active fringes distribution is in accordance with the result from the explanation of fracture energy in SFC.Laser real-time holographic interferometry can provide an effective experimental support for concrete fracture mechanics.

关 键 词：实时全息干涉法 动态干涉条纹 钢纤维混凝土 断裂过程 断裂能 

分 类 号：TU377.9[建筑科学—结构工程] O348[理学—固体力学]