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This volume provides: a) an overview of bracing utilized for I-girders, b) a discussion of the bracing systems for tub girders, and c) design requirements for the members and connections of bracing systems.
Torsional brace strength requirements for steel I-girders. Yangqing Liu1, Matthew C. Reichenbach2, Todd A. Helwig3. Abstract. Torsional bracing is often used to stabilize beams in building and bridge applications. The bracing improves the stability by restraining twist of the cross section.
23 sty 2023 · This study introduces critical imperfections at the target bracing element to ensure that the maximum bracing internal forces occur in the bracing elements of the steel I-girder bracing systems.
Abstract. The stability of steel bridges is improved by using cross frames, which provide lateral and torsional restraint along the girder length. In order to be considered an effective brace, the cross frame must satisfy both strength and stiffness requirements.
In horizontally curved girders, the effects of torsion and lateral flange bending generally control the bracing design. This section discusses bracing on two levels: 1) Bracing needed to transfer loads within a bridge system, and 2) Bracing required to provide stability to the bridge system.
13 lis 2019 · This paper presents a parametric study on the strength requirements of beam torsional bracing. An overview of the many factors affecting bracing behavior is provided. The paper demonstrates that the latest expression results in brace strength predictions that can be significantly nonconservative.
Recent research has demonstrated the propensity of I-girder systems with a relatively large length/width ratio (ie. narrow girder systems) to fail by a system mode of buckling that is not sensitive to the spacing between traditional torsional bracing systems.
