Fatigue of Partially Prestressed Concrete
Publication: Journal of Structural Engineering
Volume 112, Issue 3
Abstract
The fatigue behavior of partially prestressed concrete beams is investigated in a series of tests of bonded post‐tensioned T‐beams. The beams are simply supported with the same overall dimensions, and designed for the same flexural strength. The main parameter in the study is the degree of prestress (from 0.2–1.0). Eight beams are tested in fatigue: Five beams are subjected to a constant load cycle, while the remaining three beams are subjected to cumulative fatigue loading. All beams are initially cracked before the application of repeated loading. Rapid changes in cracking, deflections, and nonprestressed steel stress occur in the early stages of fatigue loading, and are followed by a stable period until just prior to failure. Cumulative fatigue loading always results in reduced life of the member. Fatigue failure is caused by successive fracturing of the non‐prestressed reinforcement; and no failure of pretensioned reinforcement is observed. Crack spacing approximately coincides with shear reinforcement spacing which is constant in the tests, indicating that the latter spacing may have some effect on spacing of cracks. Based on the test results, it is concluded that at present there is no justification for the use of complicated expressions to predict maximum crack width, and that the simple expression proposed by the CEB‐FIP Code gives satisfactory predictions. It appears that a degree of prestress between 0.4 and 0.6 is optimum for satisfactory cracking and fatigue response.
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References
1.
Abeles, P. W. (Dec., 1954). “Static and Fatigue Tests on Partially Prestressed Concrete.” ACI Journal, 51(12), 361–376.
2.
Abeles, P. W. (Dec., 1965). “Studies of Crack Width and Deformation under Sustained and Fatigue Loading.” PCI Journal, 10(6), 43–52.
3.
ACI Committee 215. (Mar., 1974). “Considerations for Design of Concrete Structures Subjected to Fatigue Loading.” ACI Journal, 71(3), 97–121.
4.
ACI Committee 443. (1977). “Analysis and Design of Reinforced Concrete Bridge Structures.” ACI Report No. 443R‐77, Detroit, MI.
5.
ACI Committee 224. (Oct., 1980). “Control of Cracking in Concrete Structures.” Concrete International, ACI, 2(10), 35–76.
6.
Batchelor, B. deV., and El Shahawi, M. (1983). “State‐of‐the‐Art Report on Partially Prestressed Concrete Bridge Structures.” Report No. 23156, Ontario Ministry of Transportation and Communication, Queen's Univ., Kingston, ON, Canada.
7.
Bennett, E. W., and Chandrasekhar, C. S. (July, 1971). “Calculation of the Width of Cracks in Class 3 Prestressed Beams.” Proceedings of the Institute of Civil Engineers, Vol. 49, 333–346.
8.
Bennett, E. W. (1974). “Fatigue of Reinforcement in Beams with Limited Prestress.” ACI Publications SP‐41, Detroit, MI, 301–313.
9.
Bennett, E. W., and Joynes, H. W. (Mar.–Apr., 1977). “Fatigue Resistance of Reinforcement in Partially Prestressed Beams.” PCI Journal, 22(2), 78–89.
10.
Bennett, E. W. “Partially Prestressed Members: Repeated Loading.” Presented at the June 18–22, 1984, NATO Advanced Workshop, held at Paris, France.
11.
CEB‐FIP Model Code for Concrete Structures. (1978). 3rd ed.
12.
Dean, J. A., and Park, R. (Nov., 1981). “The Observed and Predicted Cracking Behaviour of Four Partially Prestressed Concrete Beam Sections.” Journal of the New Zealand Institution of Engineers, 8(3), 65–76.
13.
El Shahawi, M. “Fatigue and Cracking Behaviour of Partially Prestressed Concrete Members.” Thesis presented to Queen's Univ. at Kingston, ON, Canada, in 1985, in partial fulfillment of the requirement for the degree of Doctor of Philosophy.
14.
FIP Committee. (1984). “Recommendations for Practical Design of Reinforced and Prestressed Concrete Structures Based on the CEB‐FIP Model Code (MC78).” London, England.
15.
FIP‐CEB Joint International Committee. (June, 1970). “Recommendations for the Design and Construction of Concrete Structure.” Cement and Concrete Association, London, England, 1–80.
16.
Foo, M. H., and Warner, R. F. “Fatigue Tests on Partially Prestressed Concrete Beams.” Presented at the June 18–22, 1984, NATO‐Advanced Research Workshop, held at Paris, France.
17.
Hanson, J. M., Somes, N. F., and Helgason, T. (1974). “Investigation of Design Factors Affecting Fatigue Strength of Reinforcing Bars.” Abeles Symposium on Fatigue of Concrete, ACI Publications SP‐41, Detroit, MI, 71–106.
18.
MacGregor, James G., Jhamb, I. C., and Nuttall, N. (Mar., 1971). “Fatigue Strength of Hot‐Rolled Reinforcing Bars.” ACI Journal, 68(33), 169–179.
19.
Meier, S. W., and Gergely, P. (Feb., 1981). “Flexural Crack Width in Prestressed Concrete Beams.” J. Struct. Div., ASCE, 107(ST2), 429–432.
20.
Ontario Highway Bridge Design Code. (1983). Ministry of Transportation and Communications, Downsview, ON, Canada.
21.
Rao, S., and Babu, K. G. “Fatigue Behaviour of Partially Prestressed Concrete Members.” Presented at the Aug., 1979, International Symposium on Nonlinear Design of Concrete Structures, held at the Univ. of Waterloo, ON, Canada.
22.
Siriaksorn, A., and Naaman, A. E. (June, 1980). “Reliability of Partially Prestressed Beams at Serviceability Limit State.” Report No. 80‐1, Department of Materials Engineering, Univ. of Illinois at Chicago Circle, Chicago, IL.
23.
Soretz, S. (July, 1965). “Fatigue Behaviour of High‐yield Steel Reinforcement.” Concrete and Construction Engineering, (London), 60(7), 272–280.
24.
Stevens, R. F. (Nov., 1969). “Tests on Prestressed Reinforced Concrete Beams.” Concrete, 3(11).
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 112 • Issue 3 • March 1986
Pages: 524 - 537
Copyright
Copyright © 1986 ASCE.
History
Published online: Mar 1, 1986
Published in print: Mar 1986
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