某特大桥索塔环向预应力模型研究

Model of Circumferential Prestress of Pylon of Super Large Bridge

索塔锚固区具有荷载力,且其位置是大跨度斜拉桥的重要部位。因此在应用预应力模型技术时应充分考虑斜拉索力并确定锚固点,以集中塔柱的索、梁锚固区应力,研究塔身U形预应力钢绞线两端张拉时的孔道摩阻损失,揭示塔身应力工况下危险截面的裂缝分布、宽度与荷载的关系。

Anchorage zone of cable-tower is mainly used for loading force, and its position is an important part of long-span cable-stayed bridge. Therefore, in the application of prestressed model technology to fully consider the cable force, and determine the anchorage point, so as to focus tower column cable, beam anchorage zone stress, the study of the U-shaped prestressed steel cable tension at both ends. The relationship between the crack distribution and the width and the load of the dangerous section under the stress condition of the tower was revealed.