界面均质度对混凝土单丝拉拔性能影响的数值模拟研究

摘要

Numerical model of fiber-concrete matrix had been generated,and the influence of interface heterogeneity on single fiber pull-out test of concrete matrix had been studied.Furthermore,load-dis-placement curves,acoustic emission (AE)accumulation curves and interface shear stress distribution curves could be obtained and interpreted.The results of this numerical study indicate that change of the interface heterogeneity has great effects on peak load and degradation of the load-displacement curves.In addition,the AE accumulation increases with the interface heterogeneity.The interface shear stress dis-tribution curves show that the shear stress distribution curves tend to be smooth with the increase of the interface heterogeneity.%建立混凝土单丝拉拔数值模拟模型，研究了界面均质度变化对单丝拉拔构件力学性能的影响，获得了拉拔构件荷载－位移曲线、声发射累计曲线及界面剪应力分布曲线等。研究表明：界面均质度变化对拉拔构件峰值荷载及劣化过程影响较大；声发射累计数随界面均质度增加而增加；同时界面剪应力分布曲线随着界面均质度增加而趋向平滑。