الفهرس 
BACKGROUND AND LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
Box girders with corrugated webs (BGCW) have been recently used
in many countries for bridges, curved bridges, interchanges, and ramps.
The main object of this research is to suggest a mathematical formula
and lor design charts [or routine design of slender box girders with
corrugated webs subjected to torsional moment. Using such slender box
girders type both in elastic and inelastic zones, the improvement in torsional
capacity over that of the conventional plate box girder will be figured.
Summarizing the important results, will serve design engineers with these
kinds of girders and suggests recommendations for future research.
A parametric study is conducted to investigate the effect of different
parameters on the overall torsional behavior such as distance between webs,
corrugation depth, webs thickness and web sub-panels dimensions. A
mathematical expression is proposed for obtaining the overall torsional
stiffness of box girders with corrugated webs. A 3D non- linear finite element modeling is presented for plate box
girders with corrugated webs under torsional loading. This model considers
both material and geometrical oon- linearties. The best ratios are chosen for
the tested geometrical parameters in the study, the flange width-to- thickness
ratio, the web height to thickness ratio and the corrugation depth to flange
width ratio. The last studied parameter is the horizontal fold width to web
thickness ratio.
A parametric study is conducted using 3D non-linear finite element
analysis to figure out the most geometrical effective parameters under
torsional loading case. A mathematical model is introduced to theoretically
depict the ultimate torsional strength of these girders and is verified versus
the finite element results. An empirical expression is suggested for the effect
of the different parameters on the ultimate capacity of these girders under
pure torsional inoment compared to the ultimate / yield moment.
Additional finite element models with the optimum configuration are
compared with the corresponding conventional plate box girders with flat
webs. Finally, conclusions and recommendations for future work are
3esented.