Abstract

This paper describes the principles, analysis and capacities of the axial-deck method developed in research on the optimization of the curved bridges directrices takin place at the UPM university in Madrid. The axial-deck method focuses on the two main structural challenges of curved cable-stayed bridges: the horizontal component of the load introduced by the stay cables on the deck; and the big torsion forces in the deck due to the unbalanced cable-stayed system. Hitherto, these problems have been addressed, either by optimizing the position of the tower and its geometric characteristics, or by modifying the morphology of the stay-cable system. Very little has been written about the possibilities of linking the structural behaviour to the deck directrix. This paper starts by describing the ideal solution equations, without considering the structure as statically indeterminate. Then, based on these equations, it follows the evolution of the method to a nonlinear iterative system. This evolution allows designs to be developed that consider the flexibility relation of all the structural systems involved in the problems. Finally, the method is validated with the redesign of two existing curved pedestrian bridges from prestigious engineering firms and the paper concludes with a structural behaviour analysis of all designs.

摘要

本文描述了在马德里 UPM 大学对弯曲桥梁方向的优化研究中开发的轴向甲板方法的原理、分析和能力。轴向桥面法侧重于弯曲斜拉桥的两个主要结构挑战：桥面斜拉索引入的载荷的水平分量；由于不平衡的斜拉系统，甲板上的扭力很大。迄今为止，这些问题已经通过优化塔的位置及其几何特征，或通过修改斜拉索系统的形态来解决。关于将结构行为与甲板准线联系起来的可能性的文章很少。本文从描述理想解方程开始，不考虑结构是静态不确定的。然后，基于这些方程，它遵循该方法向非线性迭代系统的演变。这种演变允许开发考虑到问题中涉及的所有结构系统的灵活性关系的设计。最后，该方法通过对著名工程公司的两座现有弯曲人行天桥的重新设计进行了验证，论文最后对所有设计进行了结构行为分析。