预应力钢筒混凝土管(PCCP)承受负压能力分析
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摘要
基于环形预应力作用机理,将PCCP承受的负压等效为环向作用力,计算分析了PCCP承受负压的能力,并通过有限元软件ABAQUS建立实际埋置条件下的模型,选择合适的材料本构进行数值模拟,计算结果与理论计算结果一致。结果均表明:在钢筒内管芯混凝土处施加一个大气压的负压对管芯混凝土以及插口钢圈内较薄混凝土管芯的受压应力影响不大,设计时可不考虑负压对PCCP承载能力的影响。
Based on the mechanism of circumferential prestress action, the negative pressure of PCCP is equivalent to circumferential force.The capacity of bearing negative pressure is calculated and analyzed.The model under actual embedded conditions is built with proper material constitutive relationship by finite element program ABAQUS.The calculated results are in agreement with the theoretical calculation results.Both tests show that the compressive stress of tube core concrete changes little by applying negative pressure of one bar in tube core concrete within the steel cylinder, as well as the thinner core concrete within the socket steel ring.The impact of negative pressure can be neglected when designing PCCP.
Based on the mechanism of circumferential prestress action, the negative pressure of PCCP is equivalent to circumferential force.The capacity of bearing negative pressure is calculated and analyzed.The model under actual embedded conditions is built with proper material constitutive relationship by finite element program ABAQUS.The calculated results are in agreement with the theoretical calculation results.Both tests show that the compressive stress of tube core concrete changes little by applying negative pressure of one bar in tube core concrete within the steel cylinder, as well as the thinner core concrete within the socket steel ring.The impact of negative pressure can be neglected when designing PCCP.
引文
[1]胡少伟.预应力钢筒混凝土管(PCCP)结构承载安全评价理论与实践[M].北京:中国水利水电出版社,2011.
[2]胡少伟.PCCP在我国的实践与面临问题的思考[J].中国水利,2017(18).
[3]胡少伟,刘晓鑫.PCCP管道结构承受内水压的全过程分析[J].水利水电科技进展,2011,31(2):71-73.
[4]胡少伟,沈捷,刘晓鑫,等.超大口径PCCP管内水压承载能力试验[J].水利水电科技进展,2009,29(5):9-12.
[5]胡少伟,刘晓鑫.PCCP超载破坏试验与破坏机理分析[J].水力发电学报,2012,31(1):103-107.
[6]胡少伟,沈捷,王东黎,等.超大口径预存裂缝的预应力钢筒混凝土管结构分析与试验研究[J].水利学报,2010,41(7):876-882.
[7]胡少伟,沈捷.超大口径PCCP内断丝对其承载能力影响研究[J].水利水电技术,2011,42(4):41-44.
[8]北京市市政工程设计研究总院.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].中国计划出版社,2003.
[9]ASSOCIATION A W W.AWWA standard for design of prestressed concrete cylinder pipe[S].Awwa Standards,2007,ansi/awwa c304-07.
[10]中华人民共和国水利部.预应力钢筒混凝土管道技术规范:SL702—2015[S].2015.
[11]郁龙,赵新铭,胡少伟,等.基于ABAQUS的在役PCCP管道承载水压有限元分析[J].混凝土,2015(10):135-138.
[2]胡少伟.PCCP在我国的实践与面临问题的思考[J].中国水利,2017(18).
[3]胡少伟,刘晓鑫.PCCP管道结构承受内水压的全过程分析[J].水利水电科技进展,2011,31(2):71-73.
[4]胡少伟,沈捷,刘晓鑫,等.超大口径PCCP管内水压承载能力试验[J].水利水电科技进展,2009,29(5):9-12.
[5]胡少伟,刘晓鑫.PCCP超载破坏试验与破坏机理分析[J].水力发电学报,2012,31(1):103-107.
[6]胡少伟,沈捷,王东黎,等.超大口径预存裂缝的预应力钢筒混凝土管结构分析与试验研究[J].水利学报,2010,41(7):876-882.
[7]胡少伟,沈捷.超大口径PCCP内断丝对其承载能力影响研究[J].水利水电技术,2011,42(4):41-44.
[8]北京市市政工程设计研究总院.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].中国计划出版社,2003.
[9]ASSOCIATION A W W.AWWA standard for design of prestressed concrete cylinder pipe[S].Awwa Standards,2007,ansi/awwa c304-07.
[10]中华人民共和国水利部.预应力钢筒混凝土管道技术规范:SL702—2015[S].2015.
[11]郁龙,赵新铭,胡少伟,等.基于ABAQUS的在役PCCP管道承载水压有限元分析[J].混凝土,2015(10):135-138.