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.
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