论文部分内容阅读
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。
In view of the fact that the deviation of the actual elongation in the circumferential prestressing construction of the cable-stayed bridge exceeds ± 6% of the standard requirement, the full-scale model test of the anchorage zone of the pylon in Xiaoshawan Yellow River Bridge in Inner Mongolia is carried out to analyze the influence of the tensile elongation The main factor. In order to further investigate the influence of the main factor of uneven stranding force, three simplified models of the arrangement of steel strand in the corrugated tube were established. The elongation of strand in the corrugated steel tube during tensioning was analyzed Status and specific behavior. In addition, the use of the piercing process through the strand of wire in the tension when the phenomenon of disturbances prone to put forward some opinions and suggestions, I hope in the actual construction of the tension elongation correction based on the strengthening of the small radius of the ring Prestressed strand strength of the actual state of concern.