摘要
针对预应力钢筒混凝土管(PCCP)断丝问题,提出一种创新的加固技术,即外部缠绕预应力碳纤维布(CFRP)加固。利用一根长6 m、内径1.4 m的PCCP管道,选取不同截面进行对比试验,对所提加固方法效果进行了验证。之后,基于有限元方法(FEM),建立了预应力CFRP加固断丝PCCP三维模型,并将仿真结果与试验进行了对比评估,分析了CFRP预应力水平和层数对管道受力性能的影响。研究结果表明,经预应力CFRP加固后的管道承载能力明显提高;断丝与加固对管道的影响范围有限,约为其宽度的3倍;断丝15%的管道经2层、4层和6层预应力为10%的CFRP加固后,承载能力可分别提高65.6%、103.1%和162.5%。
An innovative retrofitting technique is proposed for the wire breakage in prestressed concrete cyl⁃inder pipe(PCCP),in which prestressed carbon fiber reinforced polymer(CFRP)sheets are externally wrapped around the pipe.The validity of this technique was then verified using a full-scale test on a PC⁃CP of 6 m in length and 1.4 m in inner diameter.A three-dimensional finite element(FE)model of PC⁃CP reinforced by prestressed CFRP was established based on the verification by comparing the predicted re⁃sults with the test results.Afterwards,the CFRP prestress and number of CFRP layers were used as vari⁃ables to analysis the mechanical properties of the strengthened PCCP.The results show that the bearing ca⁃pacity of the PCCP strengthened by prestressed CFRP is improved significantly;and the influence width of wire broken and reinforcement on PCCP is limited to about three times of its width.Being strengthened by 2 layers,4 layers and 6 layers of CFRP with 10%prestress,the bearing capacity of PCCP with 15%bro⁃ken wires can be increased by 65.6%,103.1%and 162.5%,respectively.
作者
翟科杰
方宏远
郭成超
倪芃芃
付兵
李斌
ZHAI Kejie;FANG Hongyuan;GUO Chengchao;NI Pengpeng;FU Bing;LI Bin(School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;Guangdong Research Center for Underground Space Exploitation Technology,Guangzhou 510275,China;Guangdong Key Laboratory of Oceanic Civil Engineering,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;School of Mechanics and Construction Engineering,Jinan University,Guangzhou 510632,China)
出处
《水利学报》
EI
CSCD
北大核心
2021年第6期739-749,共11页
Journal of Hydraulic Engineering
基金
国家重点研发计划项目(2016YFC0802400)
河南省重大科技专项(171100310100)
国家自然科学基金项目(51978630)
河南省高校科技创新人才计划项目(19HASTIT043)
郑州大学优秀青年教师发展基金(1621323001)。
