PCCP砂浆保护层强度取值及开裂控制条件的研究和探讨
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摘要
分析了中美两国PCCP设计标准中关于砂浆强度取值以及开裂控制条件的一些规定,并基于ABAQUS有限元分析软件,模拟和研究了PCCP在安装和运行过程中砂浆保护层的力学响应机理,依据计算结果对设计标准中存在的问题进行了探讨。结果表明,目前设计中采用砂浆的抗压强度作为砂浆强度的设计值,高估了PCCP砂浆的承载能力,同时,设计标准中控制砂浆层开裂验算中的应变限值过高,导致砂浆保护层容易产生裂缝这一现象被忽视,容易导致由设计缺陷造成的PCCP结构失效和破坏。
The strength and cracking control strain limits of mortaring coating in PCCP in both AWWA standard and Chinese specification were discussed and the structural behavior analysis of mortar coating was conducted based on the ABAQUS FEM software. The comparison of simulation results and design standard shows the strength of mortar in the present design overestimates the capability of mortar coating in PCCP, as well as the strain limits of cracking control are too high so that some crackings are usually neglected. Therefore, the structural failure of PCCP caused by design defect might happen.
The strength and cracking control strain limits of mortaring coating in PCCP in both AWWA standard and Chinese specification were discussed and the structural behavior analysis of mortar coating was conducted based on the ABAQUS FEM software. The comparison of simulation results and design standard shows the strength of mortar in the present design overestimates the capability of mortar coating in PCCP, as well as the strain limits of cracking control are too high so that some crackings are usually neglected. Therefore, the structural failure of PCCP caused by design defect might happen.
引文
[1]窦铁生,燕家琪.预应力钢筒混凝土管(PCCP)的破坏模式及原因分析[J].混凝土与水泥制品,2014(1):29-33.
[2]Romer A E,Bell G E C,Ellison R D.Failure of Prestressed Concrete Cylinder Pipe[C].Pipelines,ASCE,2007:1-17.
[3]Ge S,Sinha S.Failure analysis,condition assessment technologies,and performance prediction of prestressed-concrete cylinder pipe:state-of-the-art literature review[J].Journal of Performance of Constructed Facilities,2014,28(3):618-628.
[4]孙绍平,王贯明,韩扬.预应力钢筒混凝土管(PCCP)耐久性探讨[J].特种结构,2005(3):21-25.
[5]中国工程建设标准化协会.CECS 140:2011给水排水工程埋地管芯缠丝预应力混凝土管和预应力钢筒混凝土管管道结构设计规程[S].北京:中国计划出版社,2011.
[6]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 19685—2005预应力钢筒混凝土管[S].北京:中国标准出版社,2005.
[7]American Water Works Association.ANSI/AWWA C304-99Design of Prestressed Concrete Cylinder Pipe[S].American Standard,1999.
[8]沈之基.PCCP失效解析——美国结构设计标准一个细节有错[J].城镇供水,2016(2):36-40.
[9]中华人民共和国住房和城乡建设部.JGJ/T 98—2010砌筑砂浆配合比设计规程[S].北京:中国建筑工业出版社,2011.
[10]中华人民共和国住房和城乡建设部.GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[11]程文瀼,王铁成,颜德妲.混凝土结构(上册):混凝土结构设计原理[M].北京:中国建筑工业出版社,2008.
[12]钟胜,冯新,赵琳,等.PCCP插口内壁混凝土抗裂措施的研究[J].混凝土与水泥制品,2016(11):28-31.
[13]钟胜,冯新,赵琳,等.预应力钢筒混凝土管插口内壁环裂机理分析[J].市政技术,2016(4):122-128.
[2]Romer A E,Bell G E C,Ellison R D.Failure of Prestressed Concrete Cylinder Pipe[C].Pipelines,ASCE,2007:1-17.
[3]Ge S,Sinha S.Failure analysis,condition assessment technologies,and performance prediction of prestressed-concrete cylinder pipe:state-of-the-art literature review[J].Journal of Performance of Constructed Facilities,2014,28(3):618-628.
[4]孙绍平,王贯明,韩扬.预应力钢筒混凝土管(PCCP)耐久性探讨[J].特种结构,2005(3):21-25.
[5]中国工程建设标准化协会.CECS 140:2011给水排水工程埋地管芯缠丝预应力混凝土管和预应力钢筒混凝土管管道结构设计规程[S].北京:中国计划出版社,2011.
[6]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 19685—2005预应力钢筒混凝土管[S].北京:中国标准出版社,2005.
[7]American Water Works Association.ANSI/AWWA C304-99Design of Prestressed Concrete Cylinder Pipe[S].American Standard,1999.
[8]沈之基.PCCP失效解析——美国结构设计标准一个细节有错[J].城镇供水,2016(2):36-40.
[9]中华人民共和国住房和城乡建设部.JGJ/T 98—2010砌筑砂浆配合比设计规程[S].北京:中国建筑工业出版社,2011.
[10]中华人民共和国住房和城乡建设部.GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[11]程文瀼,王铁成,颜德妲.混凝土结构(上册):混凝土结构设计原理[M].北京:中国建筑工业出版社,2008.
[12]钟胜,冯新,赵琳,等.PCCP插口内壁混凝土抗裂措施的研究[J].混凝土与水泥制品,2016(11):28-31.
[13]钟胜,冯新,赵琳,等.预应力钢筒混凝土管插口内壁环裂机理分析[J].市政技术,2016(4):122-128.