摘要
纤维增强塑料筋与珊瑚混凝土之间的粘结性能优劣决定了其协同工作效率,粘结应力在锚固区的分布规律研究对两者的粘结—滑移机理十分重要。对3组不同直径、不同保护层厚度的CFRP筋—珊瑚混凝土试件开展拉拔试验,采用光纤布拉格光栅测试技术对试验过程中的应力分布变化进行动态监测。研究结果表明:粘结应力在锚固区分布并不均匀,筋材直径越小、保护层厚度越厚应力分布均匀性系数越高,相对滑移量也有相似规律。另外,骨料分布的均匀程度对粘结应力分布亦有影响,当粒径较大的骨料集中分布CFRP筋周边时,会引起应力集中。
The bonding performance between CFRP bars and coral concrete determines their co-working efficiency.It is very important to study the bond-slip mechanism of the bond stress distribution in the anchorage zone.In this paper,three groups of CFRP bar-coral concrete specimens with different diameters and different thickness of protective layer are tested,and the dynamic monitoring of stress distribution during the test process is carried out by using the fiber Bragg grating(FBG)test technique.The results show that the distribution of bonding stress is not uniform in the anchorage zone,and the distribution and the relative slip displacement law are similar to that of CFRP bar and ordinary concrete.The distribution form is affected by the factors such as the diameter of CFRP bar and thickness of the protective layer.In addition,the distribution of bond stress is affected by the uniformity of aggregate dispersion.Stress concentration would be caused where the aggregate with larger size was distributed around the CFRP bars.
作者
陈爽
吕海波
王磊
CHEN Shuang;LYU Hai-bo;WANG Lei(College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;College of Civil Engineering and Architecture, Hezhou University, Hezhou 542800, China;College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2020年第4期741-747,共7页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51568013)
广西自然科学基金资助项目(2016GXNSFBA380175)
广西中青年教师基础能力提升项目(KY2016YB191)
广西高等学校高水平创新团队及卓越学者计划(2017)。
