Abstract Cable-stayed bridges are often the most economical solution for spans in the range of 150 to 500 m today and have therefore found widespread application over the past decades. In the design of cable-stayed bridges, the choice of partial factors applied on the permanent loads and the cable preload has a significant effect on economy and may even affect the feasibility of a project. While different design approaches are being used today, most designers consider the uncertainties of the two actions as correlated and hence apply the same partial factor to both actions simultaneously. However, in the frame of the development of the second generation of Eurocodes currently under way, a new code clause has recently been proposed which suggests considering different partial factors. The present paper aims to provide a basis for discussion based on the findings of a case study on three existing cable-stay bridges, where the impact of the aforementioned design approaches regarding the load factors for permanent load and cable preload was investigated. Based on the findings, recommendations for the load factors are given taking into account aspects of economy and safety.

中文翻译：

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斜拉桥永久作用和索预载的载荷系数

摘要 斜拉桥通常是当今 150 至 500 m 范围内跨度最经济的解决方案，因此在过去几十年中得到了广泛应用。在斜拉桥的设计中，永久荷载和拉索预载的分项系数的选择对经济性有显着影响，甚至可能影响工程的可行性。虽然今天使用了不同的设计方法，但大多数设计人员认为这两个动作的不确定性是相关的，因此同时对这两个动作应用相同的部分因素。然而，在目前正在进行的第二代欧洲规范的发展框架内，最近提出了一个新的规范条款，建议考虑不同的部分因素。本文旨在基于对三座现有斜拉桥的案例研究结果提供讨论基础，其中研究了上述设计方法对永久载荷和电缆预载荷的载荷系数的影响。根据研究结果，考虑到经济性和安全性，对负载系数提出了建议。