碳纤维掺量对单筋拉拔混凝土试件界面力学性能的影响  

Effect of fiber dosage on the mechanical behavior of fiber reinforced concrete interface

作　　者：张亚芳[1] 杨奕[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2015年第5期29-33,共5页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51278136);广州市教育局羊城学者资助项目(12A007G)

摘　　要：将单丝钢筋与混凝土的界面看作为独立的材料相,分别运用物理实验和数值模拟方法研究了单筋拉拔过程中碳纤维掺量对碳纤维增强混凝土(CFRC,Carbon Fiber Reinforced Concrete)试件粘结滑移性能的影响.物理实验表明,相比于普通混凝土,单筋在碳纤维增强混凝土基体中的拉拔粘结强度随着碳纤维掺量的增加而增强.数值模拟分析结果得到了材料试件的整体力学性能指标,再现构件的拔出破坏演化过程,表明它是一个细观损伤不断萌生、扩展、滑移并最终拔出破坏的渐进过程,单筋拔出损伤演化过程的声发射结果揭示了试件的失稳破裂机理.The interface between steel and concrete is viewed as an independent material phase to study the effect of fiber dosage including steel fiber on FRC bond-slip performance by the methods of physical experiment and numerical simulation.The experiment result shows that the bonding strength of CFRC improved with the fi-ber dosage increased compared with the common concrete.Meanwhile,the numerical simulation method is a-dopted to obtain the data of mechanical properties and the failure process is reproduced which indicates this is a gradual process of the microscopic damage initiated,propagated and finally the slip appearing.The AE result revealed the damage process and the failure mechanism.

关 键 词：界面 单筋拉拔 碳纤维增强混凝土 声发射 

分 类 号：TU528.57[建筑科学—建筑技术科学]