ABSTRACT
As a result of complicated geometrics, limited right of way, and trac mitigation, horizontally curved bridges are becoming the norm of U.S. highway interchanges and urban expressways. is type of superstructure has gained popularity since the early 1960s because it addresses the needs of transportation engineering. e superstructures of curved highway bridges are usually steel I-girders, steel box girders, or concrete box girders. Figure 6.1 shows the 20th Street HOV (High Occupancy Vehicle) Viaduct in Denver, Colorado, which is composed of curved I-girders that are interconnected by cross frames and bolted to the concrete bent cap. e cross frames are usually bolted to the transverse stieners, while the concrete deck is supported on a permanent metal deck as shown in Figure 6.2. Figure 6.3 shows the elevation of the bridge and the connection of the plate girders into an integral bent cap. Figure 6.4 shows the United States Naval Academy Bridge in Annapolis, Massachusetts, which is a horizontally curved twin steel box haunched girder bridge. Figure 6.5 shows Ramp Y at I-95 Davies Boulevard Interchange in Broward County, Florida. e structure is a single steel box girder with an integral bent cap that is pin connected to the concrete column. Figure 6.6 shows the Route 92/101 Interchange in San Mateo, California. e structure is composed of several cast-in-place prestressed curved box girder bridges.
