韦昊南,孙志恒.高压缩弹性垫层对复式碳纤维加固PCCP的应变影响分析[J].中国水利水电科学研究院学报,2021,19(3):301-307,312
高压缩弹性垫层对复式碳纤维加固PCCP的应变影响分析
Strain effect analysis of high compression elastic cushion on PCCP strengthened with composite CFRP
投稿时间:2020-07-07  
DOI:10.13244/j.cnki.jiwhr.20200120
中文关键词:  预应力钢筒混凝土管(PCCP)  高压缩弹性垫层  复式碳纤维加固
英文关键词:Prestressed Concrete Cylinder Pipe (PCCP)  high compression elastic cushion  composite CFRP
基金项目:国家“十三五”重点研发计划(2016YFC0401609)
作者单位E-mail
韦昊南 中国水利水电科学研究院, 北京 100038  
孙志恒 中国水利水电科学研究院, 北京 100038 sunzhh@iwhr.com 
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中文摘要:
      在PCCP内部粘贴复式碳纤维是一种新型的PCCP补强加固技术。为了研究不同管径及高压缩弹性垫层厚度对复式碳纤维加固PCCP的效果,本文通过建立6种管径和4种厚度垫层的复式碳纤维加固PCCP有限元模型,得到在不同内水压力和预应力钢丝断丝等工况下,垫层对复式碳纤维加固PCCP的应变影响。计算结果表明,采用5 mm厚度垫层的复式碳纤维加固PCCP,碳纤维环向应变增加了8~16倍;在0.6 MPa正常内水压力作用下,混凝土内壁环向应变的改善比例在11.5%~38.7%之间。管径越小,复式碳纤维加固效果越显著。对2.6 m管径PCCP进行复式碳纤维加固计算表明,随着垫层厚度的增加,碳纤维环向应变大幅提高,混凝土环向应变也得到显著改善。本文的研究成果为复式碳纤维加固PCCP的设计提供了参考依据。
英文摘要:
      The application of composite CFRP liner inside a PCCP is an innovative reinforcement technology. To evaluate the effect of both different pipe diameters and the thickness of high compression elastic cushion on PCCP strengthened with composite CFRP, this paper established the corresponding finite element models by six pipes with different diameters and four cushions with different thicknesses,which analyzed the influence of cushion on the strain of PCCP strengthened with composite CFRP considering the various stages of the internal pressure and the number of broken wires. The results indicate that, when the thickness of the elastic cushion is 5 mm in PCCP strengthened with composite CFRP, the circumferential strain of CFRP is increased by 8~16 times and under internal working pressure of 0.6 MPa, the inner concrete core is reduced by 11.5% ~38.7%. More pronounced reinforcement effect is shown in composite CFRP-lined PCCP with the smaller diameter. The results of composite CFRP-lined PCCP with 2.6 m inner diameter demonstrate that the circumferential strain of CFRP is improved remarkably and the deformation of the inner concrete core is obviously reduced when using the thicker cushion. The research results presented in this paper can provide technical references for the reinforcement design of composite CFRP-lined PCCP.
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