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Steel–Concrete Composite Box Girder Bridges

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    Steel–Concrete Composite Box Girder Bridges

    Steel–Concrete Composite Box Girder Bridges

    13.1 Introduction
    13.2 Typical Sections
    13.3 General Design Principles
    13.4 Flexural Resistance
    13.5 Shear Resistance
    13.6 Stiffeners, Bracings, and Diaphragms
    Stiffeners • Top Lateral Bracings • Internal
    Diaphragms and Cross Frames
    13.7 Other Considerations
    Fatigue and Fracture • Torsion •
    Constructability • Serviceability
    13.8 Design Example
    13.1 Introduction
    Box girders are used extensively in the construction of urban highway, horizontally curved, and
    long-span bridges. Box girders have higher flexural capacity and torsional rigidity, and the closed
    shape reduces the exposed surface, making them less susceptible to corrosion. Box girders also
    provide smooth, aesthetically pleasing structures.
    There are two types of steel box girders: steel–concrete composite box girders (i.e., steel box
    composite with concrete deck) and steel box girders with orthotropic decks. Composite box girders
    are generally used in moderate- to medium-span (30 to 60 m) bridges, and steel box girders with
    orthotropic decks are often used for longer-span bridges.
    This chapter will focus on straight steel–concrete composite box-girder bridges. Steel box girders
    with orthotropic deck and horizontally curved bridges are presented in Chapters 14 and 15.
    13.2 Typical Sections
    Composite box-girder bridges usually have single or multiple boxes as shown in Figure 13.1. A single
    cell box girder (Figure 13.1a) is easy to analyze and relies on torsional stiffness to carry eccentric
    loads. The required flexural stiffness is independent of the torsional stiffness. A single box girder
    with multiple cells (Figure 13.1b) is economical for very long spans. Multiple webs reduce the flange
    Yusuf Saleh
    California Department
    of Transportation
    Lian Duan
    California Department
    of Transportation

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