Discussion of "Warping Stresses in Curved Box Girder Bridges: Case Study" by Ayman M. Okeil and Sherif El-Tawil

A discussion of an article with the aforementioned title, published in this journal (Vol. 9, No. 5, September 2004), is presented. In the original paper, the authors indicated that warping has little effect on both shear and normal stresses in all the composite steel-concrete box girder bridges considered. The discusser believes that this statement needs further clarification. Warping stresses in a curved box girder consist of two portions: one due to pure torsion and the other due to distortion. Although pure torsion will induce small, usually negligible warping stresses as indicated by the authors, a large portion of the warping stress in a curved box girder is caused by distortional deformation of the box section. The authors completely neglect the warping stresses caused by distortional deformation, making the analytical model in their paper unsuitable for the analysis of warping stresses in curved box girder bridges. Instead, the discusser believes that warping stresses in curved steel box girder bridges should not be allowed to exceed 10% of the normal stress due to vertical bending.


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  • Accession Number: 01010519
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 6 2005 10:27PM