The Evolution of Concrete Cable-Stayed Bridges


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Title: The Evolution of Concrete Cable-Stayed Bridges

Author(s): Walter Podolny Jr.

Publication: Concrete International

Volume: 3

Issue: 8

Appears on pages(s): 34-42

Keywords: bridges (structures); bridge piers; con-cretes; concrete construction; precast concrete; prestressed concrete; suspension bridges.

Date: 8/1/1981

Morandi’s Lake Maracaibo Bridge constructed in 1962 is generally considered to be the first modern concrete cable-stayed bridge; however, it was preceded by two other little known concrete cabie-stayed structures. The evolution of concrete cabie-stayed bridges is traced from Torroja’s Tempui Aqueduct in Spain, completed in 1925, to present day design concepts. To the author’s knowledge, 21 cable-stayed bridges have been constructed and others are in the design stage. As late as 1970, the practical span limit for steel cable-stayed structures was considered to be 1000 ft (300 m). Currently, the Dame Point Bridge, concrete alternate, contemplates a 1300 ft (396 m) main span. Concrete cable-stayed bridges with spans of 1600 ft (500 m) are considered technically feasible. The concept of a concrete cabie-stayed bridge has extended the practical and competitive economic span range to the extent that concrete is a viable material alternative in the long-span bridge range. This article discusses the history, advantages, structural arrangement, and stay cable spacing of concrete cable-stay bridges. [Author]