纤维混凝土双丝拉拔物理实验与三维数值模拟  

Experimental and 3D numerical modeling on effect of embedment depth on performance of twin fibers pull out test

作　　者：刘浩 曾向荣[2] 张亚芳[2] 梁正召[3] LIU Hao;JZENG Xiangrong;ZHANG Yafang;LIANG Zhengzhao(Shenzhen Municipal Design Research Ins t itu te Co.L td.,Shenzhen 5;Faculty of Civi l Engineering,Guangzhou U n iv e rs i ty,Guangzhou 510006,C h in a;Faculty of Civi l Engineering,Dalian University o f Technology,Dalian 116024,C h in a)

机构地区：[1]深圳市市政设计研究院有限公司,广东深圳518029 [2]广州大学土木工程学院,广东广州510006 [3]大连理工大学土木工程学院,辽宁大连116024

出　　处：《中山大学学报（自然科学版）》2018年第3期143-148,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(51678170;51278136);广州市科技创新平台项目(15180005)

摘　　要：通过设计纤维混凝土双丝拉拔的模具,开展了双丝拉拔过程的物理实验研究,获得双丝拉拔构件的荷载-位移曲线。同时建立了双丝拉拔的三维数值模型,并考虑到纤维混凝土的三相特性和细观非均匀性,研究了不同埋深下双丝拉拔构件力学性能的影响,得出相应的拉应力分布云图、荷载-位移曲线和声发射演化图等。研究结果表明:双丝间耦合效应明显;埋深变化不仅影响构件的应力分布,且构件的峰值荷载及韧性随双丝埋深增加而增加;构件在物理实验与数值模拟下分别获得的荷载-位移曲线有相同趋势,可以简化为三线性本构关系。Twin fibers pull out tests have been designed and carried out to obtain load -displacement curves. Simultaneously , such tests have been simulated by setting a 3D numerical model , which adopts material heterogeneity. Mechanical properties of twin fibers pull out test can , therefore , be studied by changing embedment depth. The results include tensile stress distribution , load -displacement curves ,load-AE-step curves and AE evolution , and these results show that the change of twin has great influence on stress distribution. With an increasing embedment depth , peak load and toughnessincrease either. In addition , similar trend of load-displacement curve of twin fibers pull observed in both laboratory experiment and numerical simulation.

关 键 词：双丝拉拔 埋深 三维 纤维混凝土 

分 类 号：TB333[一般工业技术—材料科学与工程]