纤维直径对聚丙烯纤维混凝土单丝拉拔性能的影响  

Influence of Fiber Diameter on Properties of Single Fiber Pull-out Test of Polypropylene Fiber Reinforced Concrete

作　　者：张亚芳[1] 陈沛然[1] 刘浩 王丽 

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》2014年第7期80-85,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51278136);广东省科技计划国际合作项目(2011B050300019);广东省高等学校高层次人才项目(2050205);广州市教育局羊城学者项目(12A007G)

摘　　要：以纤维直径为变量,建立了聚丙烯纤维增强混凝土的单丝拉拔数值模型,分析了纤维直径对单丝拉拔性能的影响。结果表明:纤维直径越大,单丝拉拔试件的峰值荷载越大,但拉拔韧度和界面最大粘结强度则越小;纤维直径的变化对单丝拉拔损伤破坏现象影响甚微;纤维直径较小的试件能够获得多次声发射峰值,耗能较大,具有良好的增韧效果。Pull-out numerical models based on single polypropylene fiber has been studied with the fiber diameter set as a variable,so that influence of fiber diameter on properties of single fiber pullout has been analyzed.The results of the specimens have shown that the larger the fiber diameter is,the larger the peak load could be reached,but the less the pullout toughness and interfacial bond strength of single fiber pull-out specimen are.Furthermore,change of fiber diameter has little impact upon the damage phenomena of pullout.Multiple AE peaks could be identified for specimens with smaller diameter,actually,more energy has been consumed during the process,and hence,the pullout toughness has been improved significantly.

关 键 词：界面 单丝拉拔 纤维直径 粘结强度 拉拔韧度 

分 类 号：TU528.57[建筑科学—建筑技术科学]