摘要
通过自行设计的加载装置,采用双面剪切试验法研究了粘结长度对碳纤维增强复合材料(CFRP)-C60高强混凝土界面性能的影响,并提出了最小粘结长度的概念和有效粘结长度模型.结果表明:随粘结长度的增大,试件破坏时的极限荷载和极限位移均显著增加,但初始剥离荷载和初始剥离位移都没有明显的变化;随着荷载的增加,应力的传递区域不断向前推进,同时应力传递区域的长度也不断增加,即应力传递区域呈现动态变化;C60混凝土的最小粘结长度大约为有效粘结长度的2倍,只有当粘结长度大于最小粘结长度时才可充分发挥粘结界面的承载力,提高界面延性.
By using a self-designed loading device,the interface performance of CFRP( Carbon Fiber-Reinforced Polymer)-C60 high-strength concrete under different bond lengths are investigated via double shear tests.Then,the concept of the minimum bond length is proposed and a model of the effective bond length is established.The results indicate that( 1) with the increase of the bond length,both the ultimate bond load and the ultimate global slip response increase remarkably,while the initial strip load and the initial strip response have no significant change;( 2) with the increase of the load,the stress transfer area moves forward from the loading end and continuously prolongs,which presents a process of dynamic change;( 3) the minimum bond length of C60 concrete is about 2 times the effective bond length;and( 4) when the bond length is larger than the minimum value,the bearing capacity of the concrete can be fully used and the ductility is improved.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第2期14-19,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51378089)
海岸与近海工程国家重点实验室开放基金资助项目(SI14-3-2)~~
关键词
碳纤维增强复合材料
高强混凝土
界面性能
粘结长度
双面剪切试验
carbon fiber-reinforced polymer
high-strength concrete
interface performance
bond length
double shear test
