Posttensioned Trusses: Analysis and Design
Publication: Journal of Structural Engineering
Volume 116, Issue 6
Abstract
More than 80% of the steel truss bridges inventoried in the United States are structurally deficient and/or functionally obsolete. Posttensioning these bridges using different posttensioned tendon layouts can be a cost‐effective method to strengthen them to meet current and future loading and traffic requirements. A method for the structural stiffness analysis of posttensioned trusses is suggested. The stiffness matrices of straight, one‐drape, and two‐drape tendon layouts are developed. The tendon layout need not coincide with the truss members. However, it can be externally or internally attached to the truss. A closed‐form solution for the relationship between the cross‐sectional area, posttensioning force of the tendon, and the desired final member stress after posttensioning is derived for a statically determinate truss. Posttensioning enlarges the elastic range, increases the fatigue resistance, increases redundancy, and reduces deflection and member stresses. Thus, the remaining life of a truss bridge can be increased relatively inexpensively.
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References
1.
Baron, F., and Venkatesan, A. M. (1971). “Nonlinear analysis of cable and truss structures.” J. Struct. Div., ASCE, 97(2), 679–709.
2.
“Highway bridge replacement and rehabilitation program.” (1986). 7th Annual Report of the Secretary of Transportation to the Congress of the United States, Bridge Div., Office of Engrg., Federal Highway Admin., Washington, D.C.
3.
Jawerth, D. (1959). “Vorgespannte hangekonstruktion aus gegensinnig gekrummten seilen mit diagonalverspannung.” Der Stahlbau, Berlin, Germany, 28(5), 126–131 (in German).
4.
Krishna, P., and Sparkes, S. R. (1968). “Analysis of pretensioned cable systems.” Proc., The Institution of Civil Engineers. London, England, 39, 103–109.
5.
Mollmann, H. (1970). “Analysis of plane prestressed cable structures.” J. Struct. Div., ASCE, 96(10), 2059–2082.
6.
Poskitt, T. J. (1967). “Numerical solution of nonlinear structures.” J. Struct. Div., ASCE, 93(4), 69–94.
7.
Schleyer, F. K. (1966). “Berechnung von seilen, seilnetzen und seilwerken.” Zugbeanspruchte Konstruktionen, F. Otto, ed., 2, Ullstein Fachverlag, Berlin, Germany, 98–168 (in German).
8.
Shantong, Z. (1986). Prestressed steel structures, Chap. 6, Harbin Polytechnical Inc., China, 144–169 (in Chinese).
9.
Weaver, W., Jr., and Gere, J. M. (1980). Matrix analysis of framed structures, 2nd Ed., Van Nostrand Co., New York, N.Y.
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Copyright © 1990 ASCE.
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Published online: Jun 1, 1990
Published in print: Jun 1990
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