Lateral torsional buckling resistance of castellated beams
Keywords:castellated beam, lateral torsional buckling resistance, web distortion
Castellated beams are likely used structural elements in building structures especially in deck systems and in steel frames. The castellated beams are usually produced by cutting a traditional I-girder and welded by creating large openings in the web. The web openings can reach 70–80% of the whole web depth, therefore the effect of the holes on the structural behavior and in the design of castellated beams is not negligible. The openings have influence on the shear and on the lateral torsional buckling resistances. Most of the previous investigations in this topic were focusing on the shear buckling resistance determination and there is only a few which dealing with the lateral torsional buckling resistance. Due to the reduced out-of-plane stiffness of the web, however, different failure modes can be relevant for castellated beams comparing to traditional I-girders. In the paper the lateral torsional buckling resistance of castellated beams is studied by advanced numerical model and analysis. The lateral torsional buckling resistances are determined for different specimen geometries covering a wide parameter range. Based on the numerical investigations enhanced design methods are proposed to determine the lateral torsional buckling resistances.
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