| 预应力混凝土压力管道设计方法 |
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| 引用本文： | 李晓克,赵顺波,赵国藩. 预应力混凝土压力管道设计方法[J]. 工程力学, 2004, 21(6): 124-130,155 |
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| 作者姓名： | 李晓克 赵顺波 赵国藩 |
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| 作者单位： | 大连理工大学海岸与近海工程国家重点实验室,大连,116024;华北水利水电学院,郑州,450008 |
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| 基金项目： | 河南省优秀青年骨干教师资助计划(2002 年度)，水利部水利科技重点项目(SZ9422) |
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| 摘 要： | 根据环形预应力作用机理,结合弹性地基梁理论,提出了预应力混凝土压力管道在结构施工阶段的验算方法,给出了预应力筋束的最大间距,确定了预应力筋束分步张拉施工与荷载控制的方法。结合多层圆筒轴对称平面形变计算理论,提出了预应力混凝土压力管道运行阶段抗裂性能的验算方法,同时给出了预应力混凝土压力管道极限承载能力计算公式。所作的工作对预应力混凝土压力管道的设计与施工具有重要的应用价值。
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| 关 键 词： | 预应力混凝土 压力管道 环形预应力 抗裂度 极限承载力 设计方法 |
| 文章编号： | 1000-4750(2004)06-0124-08 |
DESIGN METHODS OF PRESTRESSED CONCRETE PENSTOCK |
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| LI Xiao-ke,ZHAO Shun-bo,ZHAO Guo-fan. DESIGN METHODS OF PRESTRESSED CONCRETE PENSTOCK[J]. Engineering Mechanics, 2004, 21(6): 124-130,155 |
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| Authors: | LI Xiao-ke ZHAO Shun-bo ZHAO Guo-fan |
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| Affiliation: | LI Xiao-ke1,ZHAO Shun-bo2,ZHAO Guo-fan1 |
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| Abstract: | A method is developed to check the fracture strength of longitudinal tensile stress of concrete during construction stage of prestressed concrete penstock. A formula is proposed to calculate the maximum distance of two consecutive strands that results in uniform distribution of concrete prestress along the penstock. The tensile steps and the tensile forces during construction stage of prestressed strands are determined for decreasing the secondary bending moment along the axis of penstock. Based on the theory of multiplayer axisymmetric plane strain model, a method is proposed to calculate the fracture strength of concrete during normal service stage. A design formula is also given to calculate the ultimate bearing capacity of prestressed concrete penstock. The work in the paper is believe to be useful for rational design and construction of prestressed concrete penstock. |
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| Keywords: | prestressed concrete penstock ring-like prestress crack resistance ultimate bearing capacity design method |
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