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小半径环向预应力张拉伸长量和钢绞线行为分析

Keywords: 桥梁工程,钢绞线行为,足尺模型试验,张拉伸长量,环向预应力

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Abstract:

针对目前斜拉桥环向预应力施工中实际伸长量偏差超出规范要求±6%的现象,通过内蒙古小沙湾黄河特大桥索塔锚固区足尺模型试验,分析了影响张拉伸长量的主要因素。为进一步探究钢绞线受力不均匀这一主要因素的影响,建立了钢绞线在波纹管内排列形式的三种简化模型,分析了钢绞线张拉时波纹管内部钢绞线的伸长状态及具体行为。另外,就采用逐根穿束工艺的钢绞线在张拉时易出现打搅的现象提出了一些意见和建议,希望实际施工中在考虑张拉伸长量修正的基础上加强对小半径环向预应力钢绞线实际受力状态的关注。

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