吴 锋,卓 杨,曹进捷,方炫强
后张法预应力混凝土管桩长期预应力损失研究
吴 锋,卓 杨,曹进捷,方炫强
摘 要:后张法预应力混凝土大管桩由于抗弯承载力高和成本低等诸多优点,在港口工程中得到了广泛的使用。由于大管桩采用干硬性混凝土经过高速离心、振动和滚压成型等特殊工艺制作而成,其长期预应力损失规律与普通预应力混凝土结构不同。本文通过在桩身上预埋传感器,对大管桩预应力筋松弛和混凝土收缩徐变引起的长期预应力损失开展研究,得到了其变化规律,为准确进行其承载力设计提供了必要的试验依据。
Abstract:Due to many merits such as high bearing capacity on bending and low cost, the large diameter concrete pile made with post-tension method is now widely used in harbour engineering:As the large pile is produced by dry-hard concrete through special procedures of high speed centrifugation, vibration and roll compaction, the lose of prestress for long time is different from conventional prestressed-concrete structures. By means of sensors embedded in the pile body, the research on its long-term prestress lose, caused by relaxtion of prestressed reinforcement and the shringage or creep of concrete, is carried out and its law has been obtained.
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