Cable Stayed Bridges

Ulstrup, Carl C.; ,

Cable Stayed Bridges

by Carl C. Ulstrup, (M.ASCE), Sr. Vice Pres. and Chf. Engr.; Steinman Boynton Gronqvist & Birdsall, 45 Broadway, New York, NY 10006,

American Society of Civil Engineers, New York, NY
978-0-87262-647-8 (ISBN-13) | 0-87262-647-4 (ISBN-10), 1988, Soft Cover, Pg. 70

See all papers/chapter

Conference information: A Session | Nashville, Tennessee, United States | May 9, 2012

Out of Print: Not available at ASCE Bookstore.

Document Type: Book - Proceedings

Abstract:

Two of these five papers on cable-stayed bridges deal with wind analysis. One develops the theory for motion due to flutter and reaches the conclusion that the vibrations are, in general, small. The other paper deals with the importance of the shape of the cross-sectional area on the motion due to wind. It also treats the problem of cables and towers during construction. The response of the bridge due to vortex shedding, galloping and buffeting is discussed. The construction of the Quincy Bridge over the Mississippi River is described. The superstructure is composite steel and concrete, the tower concrete and the cables seven-wire prestressing strands protected by an epoxy coating and encased in a grout-filled polyethylene pipe. A bridge across the Mississippi at Burlington is the topic of another paper. The design of alternate structures in steel and concrete is done by the same consultant which accounts for the striking similarity between the two bridges. They have not yet gone out for bid so the cost difference is unknown. The last paper describes the development of a parallel wire cable that contains a mixture of features of cables already in use. A long lay twist is used to maintain the shape of the cable and a polyurethane coating is applied to the wires and to fill the voids between them. In addition, galvanized wires are suggested for additional corrosion protection. No outside polyethylene tube is added to act as wrapping for the cable and keep its shape. The most radical departure from the practice of the recent twenty years is the return to sockets filled with zinc.

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