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Use of 0.7-in. diameter strands in precast pretensioned girders /

In the United States, seven-wire prestressing strands conforming to ASTM A416/AASHTO M203 (ASTM, 2015a) are used to pretension concrete bridge members. Typically, Grade 270 (ksi) low-relaxation strand is used for bonded pretensioning (referred to in this context as "prestressing strand")....

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Bibliographic Details
Main Authors: Shahrooz, Bahram M. (Author), Miller, Richard A. (Professional engineer) (Author), Harries, Kent A. (Kent Alexander), 1967- (Author), Castrodale, Reid W. (Reid Wilson) (Author)
Corporate Authors: American Association of State Highway and Transportation Officials (sponsoring body.), United States. Federal Highway Administration (sponsoring body.)
Format: Book
Language:English
Published: Washington, DC : Transportation Research Board, 2022.
Series:Report (National Cooperative Highway Administration Program ; 994.
Subjects:
Girders > Design and construction.
Concrete bridges > Design and construction.
Girder bridges.
Bridge construction.
Bridge design.
Bridge superstructures.
Fabrication.
Girders.
Guidelines.
Load and resistance factor design.
Optimization.
Pretensioning.
Long span bridges.
Prefabricated bridges.
Precast concrete.
Online Access:https://www.trb.org/Publications/Blurbs.aspx?fields=PublicationType%7CNCHRPReport
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Description
Summary:In the United States, seven-wire prestressing strands conforming to ASTM A416/AASHTO M203 (ASTM, 2015a) are used to pretension concrete bridge members. Typically, Grade 270 (ksi) low-relaxation strand is used for bonded pretensioning (referred to in this context as "prestressing strand"). For a long time, the 0.5 strand was the standard in the bridge industry. Supported by research conducted in the 1990s, 0.6-in. strand is now accepted as a means of increasing pretensioning force and, thus, extending spans, increasing girder spacing, and decreasing structural depth. The use of seven-wire, 0.7-in. Grade 270 low-relaxation strands, which are primarily used as cable or strand roof anchors in the mining/tunneling industries, may provide similar benefits as the 0.6-in. strand did previously. The 0.7-in. strands also conform to ASTM A416 (ASTM, 2015a)
Item Description:At head of title: National Cooperative Highway Research Program.
Physical Description:150 pages : illustrations, map, charts (some color) ; 28 cm
Also available online.
Bibliography:Includes bibliographical references (pages 146-150).
ISBN:9780309687041
0309687047
ISSN:2572-3766 ;