The efficiency of tapered steel section with perforation under shear buckling behaviour
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Date
2018-06
Authors
Lock, Pui Yee
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Abstract
For optimization in construction, conventional I-beam is widely replaced by tapered and
perforated section. The ideas of tapering and perforating the web of the section comes
from the reason of ununiform moment gradient throughout the beam for most cases. The
cross-sectional shape of beam is varied linearly to the moment gradient to achieve target
of higher efficiency with lower cost. The redistribution of the stress from the applied load
is caused by the tapering and perforating on the web profile. Hence, a non-linear finite
element analysis was conducted to investigate the shear deformation pattern and
efficiency of the tapered steel section with perforation in this research. A total of 148
models were simulated via LUSAS software with the variables parameters fixed as
tapering ratio, perforation shape, perforation size and perforation layout. The tapered
steel section with perforation has lower critical shear buckling load and efficiency
compared to tapered section without perforation but obtains a higher critical shear
buckling load and efficiency compared to uniform section without perforation. The
smaller the opening size and tapering ratio contributes to a larger of shear buckling
capacity and efficiency of the section. The perforation layout with different perforation
arrangement and spacing affect the shear strength and efficiency of the tapered steel
section with perforation. The highest efficiency model is selected as section with 0.4D
diamond perforation in layout 3 under tapering ratio of 0.3. The critical shear buckling
load and efficiency is reduced 14.39% and 13.91% respectively when perforations are
added onto the tapered steel section. A total of 0.56% steel material can be saved for
same structural construction by using tapered steel section with perforation compared
with tapered steel section without perforation.