塔底铰接型独塔斜拉桥施工阶段力学特性分析

为了研究塔底铰接型独塔斜拉桥施工阶段的力学行为,通过有限元软件建立空间梁格的数值模型,研究了该结构在各个施工阶段桥塔、主梁的位移、内力和应力变化情况,并对塔底铰接和固结两种设计方案的整体力学行为进行对比分析。结果表明:桥塔最大弯矩位置随着施工阶段不同斜拉索的张拉而发生改变;张拉主梁拉索时,主梁曲率半径外侧受拉,内侧受压;塔底铰接对结构整体受力更加有利。可见塔底铰接型独塔斜拉桥与常规斜拉桥施工阶段的力学行为不同,研究结论可以为未来类似结构的设计、施工和监控提供参考。

Analysis of Mechanical Characteristics of Pylon-articulated Single-pylon Cable-stayed Bridge during Construction

In order to study the mechanical behavior of the pylon-articulated single-pylon cable-stayed bridge during construction, the numerical model of the spatial beam is established by finite element software, and the displacement, internal force and stress of the pylon and main beam of the structure are obtained. The overall mechanical behavior of the two design schemes of hinge and consolidation of the two types of pylons is compared and analyzed. The results show that the maximum bending moment position of the pylon changes with the tension of different stay cables during the construction phase; when the main beam is tensioned, the radius of curvature of the main beam is pulled outside and the inner side is compressed; the root of the pylon is hinged to the structure The overall force is more favorable. It can be seen that the mechanical behavior of the pylon-articulated single-pylon cable-stayed bridge at the root of the pylon is different from that of the conventional cable-stayed bridge. The relevant research conclusions can provide valuable reference for the design, construction and monitoring of similar structures in the future.