The behaviour of axially loaded prestressed stayed columns is a commonly studied area. Despite the fact that load eccentricity in columns is commonplace in practice, the amount of investigation into these systems under eccentric loading is limited. This study employed finite element analysis to investigate the interactive post-buckling behaviour of prestressed stayed columns. Critical imperfection combination with respect to the load carrying capacity was established and a comparison of a planar and a three-dimensional model was carried out to investigate key differences in the models. In this work, it has been shown that the load carrying capacity of eccentrically loaded columns can be significantly reduced when buckling in interactive mode is observed. Furthermore, it was established that increase in eccentricity results in a decrease in load carrying capacity of columns for both planar and three-dimensional models. However, a major difference between the models is the twisting effect exhibited in the three-dimensional model under out-of-plane eccentric loading. This work highlights the importance of carefully designing prestressed stayed columns’ connections to minimise loading eccentricity as it has been shown that the benefit of employing these systems over unstayed columns reduces with increasing load eccentricity.

中文翻译：

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圆形空心截面偏心预应力斜拉柱的性能

轴向加载预应力斜拉柱的行为是一个普遍研究的领域。尽管柱中的负载偏心在实践中很常见，但在偏心负载下对这些系统的调查数量是有限的。本研究采用有限元分析来研究预应力斜拉柱的交互后屈曲行为。建立了关于承载能力的临界缺陷组合，并进行了平面模型和三维模型的比较，以研究模型之间的关键差异。在这项工作中，已经表明，当观察到交互模式下的屈曲时，偏心荷载柱的承载能力会显着降低。此外，已经确定，偏心度的增加会导致平面和三维模型的柱承载能力下降。然而，模型之间的主要区别是在平面外偏心载荷下三维模型中表现出的扭曲效应。这项工作强调了仔细设计预应力斜拉柱的连接以最小化荷载偏心的重要性，因为已经表明，使用这些系统而不是非斜撑柱的好处会随着荷载偏心的增加而减少。