Abstract:
A honeycomb beam is a non-prismatic wide flange beam with constant spaced hexagonal holes throughout its length. Most
design codes, including Specification for Structural Steel Buildings (ANSI/AISC 360-10) do not provide provisions for lateraltorsional
buckling of non-prismatic beam. In this paper, lateral-torsional buckling of honeycomb beam is studied numerically
using finite element analysis (FEA). Nonlinear time history analysis is performed to simulate the behavior of the beam loaded
perpendicular to its major axis gradually from zero until lateral-torsional buckling occurs. Two loading conditions are considered,
namely concentrated and uniformly distributed loads. Nonlinear behavior of steel material and the presence of residual stress in
the beam are considered in the analysis. The beam is assumed to be simply supported and laterally supported at both ends so that
the unbraced length of the beam is the same as the beam length. Honeycomb beams with various dimensions and various
unbraced length are analyzed. The lateral-torsional buckling moments obtained from finite element analyses are compared with
those computed using equations in ANSI/AISC 360-10 assuming the beams were prismatic without any holes. Based on this
comparison, simplified equations to predict lateral-torsional buckling moments or LTB strength of honeycomb beams under
major axis bending are proposed in this paper.
Description:
Makalah dipresentasikan pada The 3rd International Conference on Sustainable Civil Engineering Structures and Construction Materials "Sustainable Structures for Future Generations". UGM. Bali, September 5 - 7, 2016.