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This volume discusses the design of bracing systems for the superstructures of straight and curved girder systems. I-girder and box shaped members are covered.
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.
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.
23 sty 2023 · Current design specifications require bracing components to be installed to prevent I-girder sections from unexpectedly twisting due to instability. To estimate the bracing internal forces acting on the bracing elements, we can use approximate design equations that provide considerably conservative design values.
Traditional Design Approach – 2 Categories. Curved or severely skewed bridges. V-Load, 2D, or 3D analysis. Analysis results include cross-frame forces. Significant DL and LL forces.
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.
