Gerami, MohsenSaberi, HamidSaberi, VahidFirouzi, Ashkan2018-07-122018-07-122013-09Open Journal of Safety Science and Technology, 2013, 3, 43-502162-6006http://dx.doi.org/10.4236/ojsst.2013.33005http://hdl.handle.net/123456789/1855The presence of web openings in castellated beams introduces different modes of failure at the perforated sections such as excessive stresses in tee-sections, excessive stresses in mid-depth of the web post, web-post buckling, developing plastic Vierendeel mechanism. This paper presents nonlinear behavior of castellated beams under moment gradient loading and investigates the effect of beam length and braced length on moment-rotation behavior and ductility of this type of beams. Accuracy of finite element models of plain-webbed beams is evaluated comparing moment-rotation behavior and failure mode of other researchers’ numerical models and cleared a satisfactory accuracy. Rotational capacity of castellated beams, derived from numerical modeling, is compared with corresponding I-shaped plain-webbed steel beams and it is cleared that for the short beams, web openings reduce energy absorbance and plastic moment capacity of the beams more than long ones.enCastellated BeamFinite Element MethodRotational CapacityBraced LengthMonotonic LoadingNumerical ModelingMoment-Rotation BehaviorArticle