The efficiency of tapered steel section with elliptical perforation under shear and torsion behaviour
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Date
2019-06
Authors
Sua Xing Yong
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Abstract
This dissertation presents the study of structural behaviour and efficiency of tapered steel
section with elliptical perforation under shear and torsion loading conditions. The effect
of various elliptical perforation configurations such as tapering ratio, perforation size,
perforation orientation and perforation layout on the structural efficiency of tapered steel
section was investigated by using finite element method (FEM). A total of 224 models
were simulated via LUSAS software in order to carry out this study. The most efficient
model under the shear loading condition is the tapered steel section with tapering ratio
of 0.3 and vertical elliptical perforation of 0.2D in size which arranged in layout 3. The
most efficient model has a shear efficiency of 1094.35, which is 4.12% less than the
tapered steel section without perforation but it could achieve a 0.32% of weight reduction.
It was found that the smaller the tapering ratio and perforation size, the larger the shear
buckling capacity and efficiency of the elliptical perforated tapered steel section. In terms
of torsion loading condition, the most efficient models are found to be the tapered steel
section with tapering ratio 0.3, perforation size of 0.5D which arranged in Layout 1 with
all three different elliptical perforation orientations obtained the same highest efficiency
value. The most efficient models have a torsional efficiency of 9.38, which are not only
5.51% higher than the tapered steel section without perforation but also lead to a
reduction of 5.25% steel material usage. It was found that the larger the tapering ratio,
the larger the load carrying capacity of the tapered steel section with elliptical perforation.
However, the efficiency is decreases as the tapering ratio is increases. Moreover, the
different in perforation sizes showed that the smaller the perforation size, the larger the
load carrying capacity of the tapered steel section with elliptical perforation but a smaller
value of efficiency is obtained. The perforation layout was found will be affected the
load carrying capacity and efficiency of the elliptical perforated tapered steel section for
both different loading conditions.