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The purpose of this study was to determine the effects of inelastic Lateral-Torsional Buckling (LTB) loads and their behavior on fixed circular aluminium channel arches under transverse point load at the shear centre. A total of 55 arch models were developed and analyzed using a three-dimensional Finite Element Analysis (FEA) commercial software called Abaqus. The analyses were based on the combination of inelastic imperfection variables consisting of material nonlinearity, geometric imperfection, and residual stresses using two design approaches. The first approach used a constant span length having various channel profiles. Whereas, in the second approach different constant slender ratios with a single channel profile was analyzed. The prebuckling results generated using FEA method showed good agreement with those computed using existing analytical solutions. In addition, variations in web-flange thickness, web height, and slender ratios have been shown to significantly impact the magnitude of the buckling load. Besides, profiles with high torsion constant were found to be more resistant to LTB. In addition, it was established that arches developed from single channel profile having a low constant slender ratio have high resistance against LTB. On the other hand, arches formed at constant span length, with included angles of 50° ≤ 2α ≤ 90° designated as moderated were found to be more suitable for the designs against LTB than those referred as shallow with 2α < 50°. The least resistance was noted at 90° < 2α ≤ 180° arches normally denoted as deep. In contrast, for arches developed at a constant slender ratio, the respective order of high resistivity to LTB was categorized as follows, 90° < 2α ≤ 180°, 50° ≤ 2α ≤ 90 and 2α < 50°. Keyword: circular fixed arches, inelastic lateral-torsional buckling, shear centre, transverse point load, imperfections, prebuckling, shallow, moderate and deep arches

Inelastic Lateral-Torsional Buckling Load on Fixed Circular Channels Arches Under Transverse Point Load