Mirambell the ratio of flange width to

Mirambell and Zarate (2004) 9 offered recommendations for the treatment of field action due to tension as well as flexure and shear interaction based on FEM (Finite Element Modeling ) analytical modeling. Earlier to this work, Mirambell and Zarate (2000) 8 presented a critical shear stress expression and shear buckling coefficient for tapered web members. A finite element model was generated and parametric studies carried out to determine the relative influence of slenderness of flange, angle of tapering and the ratio of flange width to greatest web depth, on the buckling coefficient of plate.
One of the value of critical shear stress resulted from the suggested analysis, which on further applied for the analysis of the web at the narrow end of the member. Probably in design the thickness of web and the aspect ratio would be determine in such a way that the critical stress is not surpassed at the very narrow end of the specimen taken as this was considered to be the critical cross-section in the development of the buckling coefficients of the plate. This is somewhat counterintuitive, and one would expect the critical buckling section to be at the cross-section of greatest slenderness. The analysis does not include flanges having unequal thickness however, it might be reasonable to assume both thicknesses of the flange is equal to that of the thinner flange, as the effective restraint provided by the flange to web rotation would be conservative.
The authors note that a panel located near the mid span of a stiffened member has appropriate boundary conditions, and both the ends of the panel are controlled against translation in the longitudinal direction. The flanges at the narrow end are permitted to rotate about an axis normal to the plane of the web, however the restraint offered against translation in the longitudinal direction basically fixes the narrow end rotationally. This permits a moment to be resisted at the narrow end and is therefore unsuitable for end panels as it lacks the rotational restriction provided by adjacent panels. Investigation of the specimens used in the present study according to these requirements is not appropriate. However, the recommendations provided by Mirambell and Zarate show assurance for intermediate panels of stiffened tapered members, and warrant a contrast with experimental data that cannot be offered here.

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Last updated: August 12, 2019


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