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

平行钢绞线拉索常用于斜拉桥和矮塔斜拉桥。一段时间以来，桅杆上使用鞍形锚代替楔形锚，因为鞍形锚更坚固。在这些鞍座内，电线分别穿过桅杆。目前，这种鞍座的尺寸仍然很大，由于缺乏理论上的见解，因为保守的限制，最小电缆弯曲半径。柏林工业大学的概念和结构设计系正在研究半径更小的鞍座，以使其更加紧凑、节省空间和具有成本效益。本研究针对索鞍边缘区域的索股应力和索鞍与索梢之间的接触压力分布进行了实验、解析和数值研究。我们将探讨机械基础知识，并提供一个简化的工程模型。此外，考虑了不同材料和不同厚度的绞线支撑的影响。还检查了具有良好定义的惯性矩的张力元件，例如钢带，以确定股线的弯曲刚度与她的单个线的滑动对结果的影响。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.