FIGURE 25.32 Precast AASHTO I-beam sections: (a) AASHTO beam types II, III, and IV and (b) AASHTO beam types V and VI (FHWA 1990). Box Girder

Figure 25.35 shows FHWA (1990) standard types of precast box sections. Figure 25.36 shows Caltrans standard precast "Bathtub" girder (Caltrans 2001). The shape of a cast-in-place prestressed concrete box girder is similar to the conventional reinforced concrete box girder (Figure 25.31c). The spacing of the

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