预应力损失对BCCP管道安全性影响研究
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摘要
钢筋缠绕钢筒混凝土压力管(BCCP)是一种由传统的预应力钢筒混凝土管改进而来的新型复合管材,具有较好的应用前景。为研究预应力损失对此种新型管道安全性的影响,借助有限元软件ABAQUS建立了三维有限元模型,考虑材料非线性,计算了不同预应力损失下BCCP达到3种极限状态对应的内水压极限值。结果表明:工作极限状态和弹性极限状态下的内水压随预应力损失量的增加而降低,而强度极限状态下的内水压随预应力损失量的增加而增加,预应力损失降低了BCCP正常工作的承载性能,但不会影响最终的屈服破坏。研究结果对该管型在工程中的应用具有一定的参考价值。
Bar-wrapped Cylinder Concrete Pressure Pipe (BCCP) is a new type of composite pipe improved from traditional prestressed concrete cylinder pipe,and has good application prospect. In order to study the effect of prestress loss on safety,three-dimensional finite element model was set by finite element software ABAQUS. Considering material nonlinearity and different prestress loss,the internal water limit pressures under three limiting states were calculated by the model. The results showed that the internal water pressure decreases with the increase of prestress loss under working limit state and elastic limit state. However,the internal water limit pressure increases with the increase of prestress loss under strength limit state. Prestress loss can reduce the load performance of normal work,but has no effect on ultimate yield failure. The research results have some reference value for the application of this pipe in engineering.
Bar-wrapped Cylinder Concrete Pressure Pipe (BCCP) is a new type of composite pipe improved from traditional prestressed concrete cylinder pipe,and has good application prospect. In order to study the effect of prestress loss on safety,three-dimensional finite element model was set by finite element software ABAQUS. Considering material nonlinearity and different prestress loss,the internal water limit pressures under three limiting states were calculated by the model. The results showed that the internal water pressure decreases with the increase of prestress loss under working limit state and elastic limit state. However,the internal water limit pressure increases with the increase of prestress loss under strength limit state. Prestress loss can reduce the load performance of normal work,but has no effect on ultimate yield failure. The research results have some reference value for the application of this pipe in engineering.
引文
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[3]佟可蕙,文斯翔,李忠喆,等.混杂纤维细石混凝土阻裂效应研究[J].低温建筑技术,2013,35(10):4-6.
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[13]熊欢,李鹏辉,李庆斌,等.PCCP受载响应分析中三种预应力施加方法的比较研究[J].水力发电学报,2010,29(6):178-186.
[14]何卓飞.PCCP管道裂缝发展规律及预应力损失模拟分析[D].郑州:华北水利水电大学,2015.
[15]周沈安,汪基伟,冷飞.混凝土结构有限元计算中预应力模拟方法及比较[J].人民长江,2015,46(24):38-42.
[16]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]申冬建,王铁成,杜喜凯.C45细石混凝土力学性能的试验研究[J].河北农业大学学报,2006,29(5):114-117.
[3]佟可蕙,文斯翔,李忠喆,等.混杂纤维细石混凝土阻裂效应研究[J].低温建筑技术,2013,35(10):4-6.
[4]董乐.PCCP预应力分布与损失研究[D].南京:南京航空航天大学,2014.
[5]赵晓露.裂缝与断丝对预应力钢筒混凝土管的结构安全性影响研究[D].北京:中国水利水电科学研究院,2013.
[6]彭寿海.超大口径预应力钢筒混凝土管(PCCP)结构分析[D].北京:清华大学,2009.
[7]石亦平,周玉蓉.ABAQUS有限元分析实例详解[M].北京:机械工业出版社,2006.
[8]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.
[9]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.
[10]聂建国,王宇航.ABAQUS中混凝土本构模型用于模拟结构静力行为的比较研究[J].工程力学,2013,30(4):59-67.
[11]Association A W W.AWWA standard for design of prestressed concrete cylinder pipe[S].Awwa Standards,2007,ansi/awwa c304-07.
[12]沈捷.超大口径PCCP结构安全性能试验与数值分析研究[D].南京:南京水利科学研究院,2010.
[13]熊欢,李鹏辉,李庆斌,等.PCCP受载响应分析中三种预应力施加方法的比较研究[J].水力发电学报,2010,29(6):178-186.
[14]何卓飞.PCCP管道裂缝发展规律及预应力损失模拟分析[D].郑州:华北水利水电大学,2015.
[15]周沈安,汪基伟,冷飞.混凝土结构有限元计算中预应力模拟方法及比较[J].人民长江,2015,46(24):38-42.
[16]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.