The structural efficiency of tapered steel section with perforation under lateral torsional buckling behaviour
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Date
2018-06
Authors
Lim, Cheng Kuan
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Abstract
Tapered beams have the ability to resist a maximum stress at a single location
while the stresses are considerably lower at in the rest of the member and therefore it
could have a higher structural efficiency compared to conventional beams. It could also
satisfy functional requirements while reducing weight and cost in many fields of civil
construction. Perforation in steel section also eases the integration of Mechanical and
Electrical (M&E) services such as ventilation pipes and electrical cables within the
structural depths of the beam. In this research, the structural efficiency of tapered steel
section with perforation under lateral torsional buckling behaviour were investigated. A
total of 81 models were analysed using LUSAS software and five variables that are being
investigated are size of opening, shape of opening, opening layout, tapering ratio and
flange and web thickness. Buckling moment is obtained from the results in LUSAS while
self-weight and structural efficiency is calculated manually. From the results, opening
size of 0.75D has the highest structural efficiency although it can withstand a smaller
buckling load. This is due to its lower self-weight compared to other opening size. Square
opening shape also has the highest structural efficiency compared to circular opening and
diamond opening. The percentage increase in structural efficiency of square opening
shape of 0.75D is the highest at 3.07%. Circular opening shape of 0.75D with OpenOpen-Open opening layout has the highest percentage increase in structural efficiency
which is 2.37%. Tapering ratio of 0.3 is the most structurally efficient and the percentage
increase in structural efficiency is 114.36%. The flange thickness of 0.02m and web
thickness of 0.015m has the highest structural efficiency at 45.756 and 29.171
respectively. In conclusion, a beam should be able to resist large buckling moment and
has a lower self-weight as well in order to has a high structural efficiency.