Dynamics of spall failure in fiber reinforced concrete due to blasting
Dynamics of spall failure in fiber reinforced concrete due to blasting
复制标题
DOI：
10.1016/j.conbuildmat.2006.04.007
复制
发表时间：
2007-03
影响因子：
7.4
通讯作者：
M. Ohtsu;F. Uddin;Weiguang Tong;K. Murakami
中科院分区：
文献类型：
--
作者：
M. Ohtsu;F. Uddin;Weiguang Tong;K. Murakami
对纤维钢筋混凝土（FRC）板的动力破坏进行了试验和分析研究。由于爆破，在标本中产生了损坏区域，如顶部表面的陨石坑和底部的碎片。结果表明，随着FRC混凝土抗弯韧性的增加，其平均粒径和体积显著减小。由于碎片的最终损伤区域可能与爆破引起的共振模式相关联，因此采用边界元法分析了爆破峰值频率处的振动模式。应力分析证实了共振模态的应力集中区域与小块区域之间存在显著的一致性。从而，澄清了FRC试件的碎裂破坏动力学。
Dynamic failure in fiber-reinforced concrete (FRC) slabs was studied experimentally and analytically. Due to blasting, damaged areas were created in the specimens, as the crater at the top surface and as the spall at the bottom. It was observed that the averaged diameters and the volumes of the spall failure remarkably decreased with the increase in the flexural toughness of FRC concrete. Because the final damaged areas of the spall could be associated with the resonance modes due to blasting, vibration modes at peak frequencies of blasting were analyzed by applying the boundary element method. From the stress analysis, remarkable agreement between stress-concentrated regions of the resonance modes and the spall areas was confirmed. Thus, dynamics of the spall failure in FRC specimens are clarified.