Abstract The structural stability of steel arches comprising Circular-Hollow-Sections (CHS) is examined in the present study. Appropriate finite element models are developed, accounting for geometry and material nonlinearities, as well as, incorporating residual stresses and geometric imperfections of roller-bent arches. A verification study is first performed to evaluate the accuracy of the proposed finite element modeling, followed by sensitivity analyses aiming at estimating the effects of residual stresses and geometric imperfections on the structural response. Findings reveal that the magnitude of geometric imperfections and the distribution of residual stresses significantly affect the arch's buckling resistance. An extensive parametric study is carried out to assess the spatial stability of arches comprising a wide range of non-dimensional slenderness, commonly encountered in the civil engineering practice. Based on the results of parametric analyses, suitable parameters are determined for the in-plane and out-of-plane buckling. Finally, stability criteria are proposed via regression analyses, which are used to define relevant buckling curves according to structural steel design standards.

中文翻译：

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滚弯圆空心截面钢拱的稳定性判据

摘要 本研究研究了由圆形空心截面（CHS）组成的钢拱的结构稳定性。开发了适当的有限元模型，考虑了几何和材料非线性，并结合了滚弯拱的残余应力和几何缺陷。首先进行验证研究以评估提议的有限元建模的准确性，然后进行敏感性分析，旨在估计残余应力和几何缺陷对结构响应的影响。研究结果表明，几何缺陷的大小和残余应力的分布显着影响拱的抗屈曲能力。进行了广泛的参数研究，以评估包括广泛的无量纲细长的拱的空间稳定性，这在土木工程实践中很常见。根据参数分析的结果，确定平面内和平面外屈曲的合适参数。最后，通过回归分析提出稳定性准则，用于根据结构钢设计标准定义相关屈曲曲线。