Title:
Reliable Corrosion Protection for Bridge Stay Cables
Author(s):
Miki Funahashi
Publication:
Concrete International
Volume:
17
Issue:
2
Appears on pages(s):
33-37
Keywords:
anchorage (structural); bridges (structures); durability; cable-supported structures; corrosion resistance; fatigue (materials); spans; Construction
DOI:
Date:
2/1/1995
Abstract:
Over the last 25 years, cable-stayed bridges have become increasingly popular for medium- and long-span crossings of waterways. Their popularity stems from advancements in prestressed concrete structure technology and economic advantages over other types of structures. A cable stay system consists of the tension element (stressing steel, cable sheath and cementitious grout) and anchorages. There are three different arrangements of stay cables. The "fan" type of stay cable arrangement distributes the load close to the top of the pylon. The "harp" arrangement, in which the stay cables are parallel to one another, distributes the load along the pylon. This reduces the buckling effects of the pylon. The "mix" arrangement, which combines the "fan" and "harp," is derived from the "fan" concept but spaces the anchorages along the pylon. This article examines the protection of bridge stay cables with regard to anchorage, sheathing, and multiple-barrier corrosion protection systems.