The two-span bridge on SR 542 across I-5 near Bellingham, WA provides an attractive, low-profile structure that combines the appearance of a cast-in-place box girder with the advantages of precast, prestressed construction. Using a post-tensioned segmental design, with two segments per girder, resulted in clear spans of 95' to 109' across the Interstate highway. The open-topped "tub" girders have 1:7 sloping sides and support a 7½" thick cast-in-place roadway deck. The 6' wide girders are spaced 10 feet apart and, with 8 girders per span, provide an 85 foot wide superstructure for the overpass.

Products

Precast Prestressed Girders - 32 (ea) - 40½" deep x 6’ wide x 39' to 54' long trapezoidal "tub" girders

Features

Attractive - Smooth, sloping sides of the trapezoidal girders emulate the appearance of of a cip box structure.

No Shoring - Precast sections result in a safer and smoother flow of traffic below the bridge during construction by eliminating the form shoring needed for a cast-in-place superstructure.

Thin - Relatively shallow "tub" girders yield a favorable span/depth ratio, thus reducing the depth of the superstructure.

Credits