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girder systems. I-girder and box shaped members are covered. Bracing for other types of bridges, such as truss, arch or towers is not specifically addressed; however much of the information included in this volume may be applicable. Bracing systems serve a number of important roles in both straight and horizontally curved bridges.
This module discusses the design of bracing systems for the superstructures of straight and curved girder systems. I-girder and box shaped members are covered.
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. Adequate stability bracing must satisfy both stiffness and strength requirements.
The virtual box uses the deck slab or deck plate and plan bracing between the bottom flanges of two adjacent I girders to form a shape with torsional stiffness which can be used instead of a box girder.
The module provides: a) an overview of bracing utilized for I-girders is covered, b) a discussion of the bracing systems for tub girders, c) design requirements for the members and connections of bracing systems.
Steel Bridge Design Handbook: Bracing System Design. This module discusses the design of bracing systems for the superstructures of straight and curved girder systems. I-girder and box shaped members are covered.
Torsional bracing is aimed to prevent twisting of the cross-section and improve lateral-torsional buckling (LTB) strength of steel I-girders (Fig. 1). Bridge girders with torsional bracing are usually designed assuming that buckling length is equal by the distance between the brace points.
