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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. |