doi:10.3850/978-981-08-7920-4_S2-S111-cd
Assessment of the Moment Carrying Capacity of Girders with Web Openings
Amr M. I. Sweedan
Department of Civil and Environmental Engineering, UAE University,
Al-Ain, UAE.
ABSTRACT
Use of steel girders with web openings in constructing floor beams of building structures
and footbridges is becoming more popular due to their cost effectiveness compared to the
labor-intensive lattice construction or conventional solid web sections. Despite the fact that the
increase in the height of the section due to web openings leads to significant enhancement in
its flexural strength, the discontinuity in the girder cross-section due to the presence of web
openings may affect the girder load carrying capacity. This may occur in the particular failure
mechanism in which the girder fails by lateral distortional buckling prior to the attainment
of its full flexural capacity. In the lateral distortional buckling mechanism, and as a result
of the variation of the bending moment along the girder axis, the strength of the girder is
highly influenced by themoment distribution along the girder’s longitudinal axis. In the current
study a three-dimensional finite elementmodel is developed to investigate the flexural-torsional
behaviour of girders with circular web openings under various loading conditions. Numerical
analysis is conducted to determine the critical buckling moment of perforated girders and
the corresponding buckling mode. The impact of girder slenderness and web openings size
on the moment carrying capacity is also examined. Recommendations are provided for the
applicability of the moment gradient formula of conventional sections for sections with circular
web openings.
Keywords: Steel girders, Web openings, Finite element, Moment carrying capacity.
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