摘要
改进了传统的碳纤维增强复合材料(CFRP)加固砌体的结构方式,采用CFRP满贴半包裹加固砌体墙受冲击面,对CFRP改善砌体墙抗泥石流冲击性能进行了试验.基于三维数字散斑影像相关方法测量试验墙面位移场和节点时程位移,比较了CFRP加固前后砌体墙的破坏情况及墙面位移特点,分析了CFRP加固对砌体墙抗冲击性能的改善情况及加固前后砌体墙受冲击作用下的破坏机理.试验结果表明:传统砌体结构抵抗泥石流冲击性能较差,在砌体墙承受能量为37,343,809,1 568 J的撞击各两次后将完全破坏;而碳纤维布加固后的砌体墙可继续承受6次1 568 J的撞击才完全破坏;墙体采用CFRP加固后具有更好的整体性,其在泥石流冲击作用下的位移显著减小且分布更加均匀,抗变形和抗裂性能明显提高,抵抗泥石流冲击荷载能力显著改善.
The traditional masonry reinforcement method with CFRP(carbon fiber reinforced polymer)was improved,making the impacted surface of masonry wall fully covered and half wrapped,and an experimental study on the impact resistance of masonry walls strengthened with CFRP under debris flow was conducted.Based on the three-dimensional digital speckle image correlation method,the displacement field of test walls was measured,and the damage of masonry walls and characteristics of displacement fields before and after CFRP reinforcement were compared.The improvement of the impact resistance after CFRP reinforcement and the destruction mechanism of masonry walls before and after reinforcement under the impact were discussed.The test shows that the traditional masonry structure has poor impact resistance against debris flow,and the masonry wall will be significantly damaged when it is subjected to the impact energy of 37,343,809 and 1568 J twice,while the masonry wall strengthened with CFRP can withstand 6 other impacts of 1568 J before completely damage.The integrity of the wall is better after CFRP reinforcement.The displacement of the wall under the impact of debris flow is significantly reduced and the distribution is more uniform.The anti-deformation and anti-cracking performances are significantly improved,and the resistance of the debris flow impact is significantly improved.
作者
刘曙光
邱皓廷
张洪
李培振
LIU Shuguang;QIU Haoting;ZHANG Hong;LI Peizhen(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期96-100,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家科技支撑计划资助项目(2014BAL05B01)。
关键词
泥石流
碳纤维增强复合材料
砌体墙
数字散斑
影像相关
debris flow
carbon fiber reinforced polymer(CFRP)
masonry walls
digital speckle
image correlation
作者简介
刘曙光(1962-),男,教授,E-mail:liusgliu@tongji.edu.cn.
