Strands of stay cable bridges on saddles with small radii - stresses, contact pressure and wire tip forces

斜拉桥和斜拉桥常采用平行钢绞线制成的缆索。一段时间以来，桅杆上用鞍座代替楔锚，因为它们更坚固。在这些鞍座内，电线分别通过管道通过桅杆。目前，由于缺乏理论洞察力和对电缆最小弯曲半径的保守限制，这种鞍座的尺寸仍然非常大。柏林工业大学概念和结构设计部研究了半径更小的鞍座，使它们更加紧凑，节省空间和成本效益。本课题主要从实验、解析和数值三个方面研究了钢丝束的应力和钢丝尖与鞍座之间的接触压力分布。我们将探索机械基础，并提供一个简化的工程模型。此外，还考虑了不同材料和股支撑厚度的影响。还检查了具有明确定义的惯性矩的张力元件，如钢带，以确定钢索的弯曲刚度和单根钢丝的滑移对结果的影响。采用有限元法进行了数值试验。

Cables from parallel steel strands are often used in cable-stayed bridges and extradosed bridges. For some time now saddles are used instead of wedge anchors in the mast, because these are more robust. Within these saddles the wires are piped separately in channels through the mast. Currently, the dimensions of such saddles are still very large due to the lack of theoretical insight and because of conservative restrictions of the minimum cable bent radii. Saddles with substantially smaller radii are investigated at the Department of Conceptual and Structural Design of TU Berlin to make them even more compact, space-saving and cost-effective. In this project the stresses of the strands and the contact pressure distribution between the wire tip and saddle are studied experimentally, analytically and numerically focusing on in the edge region of the saddles. We will explore the mechanical basics and provide a simplified engineering model. Additionally, the influence of different materials and thicknesses of the strands support is considered. Tension elements with a well-defined moment of inertia such as steel bands are also examined to identify the influence of the bending stiffness of the strands with her slip of individual wires on the results. The numerical tests are performed with the method of finite elements.