Distortional buckling behavior and design consideration of castellated beams considering residual stresses

This work will focus on the distortional buckling behavior of castellated beams with the related design consideration of moment gradient factor and residual stress. With the limited studies on the distortional buckling behavior of castellated beams and a lack of design recommendations, there necessitates more studies related to this behavior of the beams. Firstly, an experimental investigation on the distortional buckling of castellated beams fabricated from two hot-rolled parent profiles is briefly introduced in this study. The distortional buckling behaviors of the castellated beam was carefully measured and analyzed. Based on the test results, the design consideration of the moment gradient factor was discussed. To examine the influence of the fabrication procedure on the residual stress pattern, the residual stresses were measured in a number of castellated member specimens and their parent sections. These measured residual stresses demonstrated the distribution of the residual stresses in the castellated beam sections and provide a data set for future validation of computational simulation of the residual stress pattern for design recommendation.

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