Effect of longitudinal stiffeners on flexural behavior of box beams: a state-of-the-art review
By: Sharma, Ishu
.
Contributor(s): Singh, Gyani Jail.
Publisher: USA Springer 2023Edition: Vol.104(2), Jun.Description: 517-527p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Journal of the institution of engineers (India): Series ASummary: The purpose of this article is to review the impact of stiffening the flange on the flexural behavior of box beams. Steel box beams with stiffeners applied to their flanges have a significantly lower effective width ratio than those with thickened flanges. In the reported studies, the effect of closely spaced stiffeners is discussed, but it is not explained how the stiffeners reduce the effective width ratio to a lower extent. A few studies have attempted to analyze the bending behavior of stiffened flange steel box girders considering shear lag effect; however, they are limited to fully retrained end box beams. Other studies ignore critical factors such as material properties and section properties. Steel box beams with stiffened flanges are typically evaluated by adding stiffeners to the flange area to mobilize stiffener stiffness. The proportional mobilization of stiffness from the stiffener to the flange is insufficient to produce a low effective width ratio. A concrete layer applied over the flange of steel box girders reduces the shear lag effect and, therefore, results in a higher effective width ratio. Using a concrete layer together with stiffeners to retrofit stiffened flange steel box girders is rarely reported in the literature. Therefore, estimating the shear flow capacity of the flange is necessary for steel box beams or composite box beams with stiffened flanges to analyze their bending behavior critically. A simplified procedure may be developed to examine how stiffeners placed across flanges (spacing), as well as their number, and dimensions, affect the bending behavior of box beams. The procedure may also be applicable to support types and loading conditions.
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Articles Abstract Database
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School of Engineering & Technology Archieval Section | Not for loan | 2023-1752 |
The purpose of this article is to review the impact of stiffening the flange on the flexural behavior of box beams. Steel box beams with stiffeners applied to their flanges have a significantly lower effective width ratio than those with thickened flanges. In the reported studies, the effect of closely spaced stiffeners is discussed, but it is not explained how the stiffeners reduce the effective width ratio to a lower extent. A few studies have attempted to analyze the bending behavior of stiffened flange steel box girders considering shear lag effect; however, they are limited to fully retrained end box beams. Other studies ignore critical factors such as material properties and section properties. Steel box beams with stiffened flanges are typically evaluated by adding stiffeners to the flange area to mobilize stiffener stiffness. The proportional mobilization of stiffness from the stiffener to the flange is insufficient to produce a low effective width ratio. A concrete layer applied over the flange of steel box girders reduces the shear lag effect and, therefore, results in a higher effective width ratio. Using a concrete layer together with stiffeners to retrofit stiffened flange steel box girders is rarely reported in the literature. Therefore, estimating the shear flow capacity of the flange is necessary for steel box beams or composite box beams with stiffened flanges to analyze their bending behavior critically. A simplified procedure may be developed to examine how stiffeners placed across flanges (spacing), as well as their number, and dimensions, affect the bending behavior of box beams. The procedure may also be applicable to support types and loading conditions.
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