自锚式悬索桥主塔稳定计算方法及影响因素分析

Analysis of Stability Calculation Method and Influence Factors on Main Pylon of Self-anchored Suspension Bridge

自锚式悬索桥力学特性与传统地锚式悬索桥有所区别。该文分析了稳定计算原理,并以西宁市海湖新区文汇路跨湟水河大桥为例,将主塔稳定计算放在全桥总体模型中进行,考虑了全桥其他构件对主塔刚度的影响,分别针对不同边界条件计算主塔稳定临界力。结果表明:主梁纵向约束条件对自锚式悬索桥的主塔稳定计算影响较大,当塔梁之间设置纵向约束时,主塔稳定临界力相比纵向滑动体系提高较多。塔梁之间的转动约束对主塔稳定影响相对较小。

The mechanics characteristic of self-anchored suspension bridge is quite different from the traditional earth anchored suspension bridge.The article analyzes the stability calculation principle,and by the case of Xining City Haihu New Area Wenhui Road Bridge Crossing Huangshui River,introduces the stability calculation of the main pylon in the master model of the whole bridge,and considers the influence of the other members of the whole bridge on the rigidity of the main pylon.Separately aiming at the different boundary conditions,the stability critical force of the main pylon is calculated.The result shows that the longitudinal restraint of the main girder greatly influences the stability calculation of the main pylon of the self-anchored suspension bridge.When the longitudinal restraint is set up between the pylon and the girder,the stability critical force of the main pylon is improved more than the longitudinal sliding system.The rotation restraint between the pylon and the girder influences the stability of the main pylon a little.