TITLE:
Effect of Beam Length and Braced Length on Moment-Rotation Behavior of Castellated Beams
AUTHORS:
Mohsen Gerami, Hamid Saberi, Vahid Saberi, Ashkan Firouzi
KEYWORDS:
Castellated Beam; Finite Element Method; Rotational Capacity; Braced Length; Monotonic Loading; Numerical Modeling; Moment-Rotation Behavior
JOURNAL NAME:
Open Journal of Safety Science and Technology,
Vol.3 No.3,
September
20,
2013
ABSTRACT: The 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.