界面控制下间距对双丝拉拔实验影响的数值模拟研究  

Numerical Simulation on Twin Fibers Pull-out Test Under Interfacial Control with Effect of Spacing

作　　者：张亚芳[1] 曾向荣[1] 刘浩[1,2] 吴庆华[1] 

机构地区：[1]广州大学土木工程学院,广州510006 [2]合乐中国有限公司

出　　处：《武汉理工大学学报》2015年第9期78-83,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51278136);广州市教育局羊城学者资助项目(12A007G);广州市科技创新平台项目(15180005)

摘　　要：从细观非均匀性角度建立了含骨料的混凝土双丝拉拔数值模拟模型,研究了双丝间距变化对双丝拉拔构件的力学性能影响,观察了双丝构件拉拔过程中构件裂纹萌生、扩展直至失稳破坏全过程,获得了不同双丝间距构件的剪应力分布数值光弹图、荷载-位移曲线、声发射计数曲线及沿界面剪应力分布曲线等。研究表明:构件的峰值荷载随双丝间距增加而增加;构件韧性随双丝间距增大而减少;同时间距变化对沿界面剪应力分布影响较大。Effect of fiber spacing was carefully studied by setting a mesoscopic heterogenous numerical model of twin fibers and concrete matrix in this paper. The failure process from crack initiation to instability failure was observed. With photoelastic figures of shear stress,load-displacement curves,acoustic emission accumulation curves and shear stress curves of interfaces were obtained. When the spacing increases,the peak load will increase and toughness will decrease. In addition,it is observed that the fiber spacing has also great effect on the shear stress distribution.

关 键 词：双丝拉拔 间距 界面 剪应力 

分 类 号：TU528.57[建筑科学—建筑技术科学]