Collapse of Square PSC Slabs with Corner Restraint
Publication: Journal of Structural Engineering
Volume 111, Issue 2
Abstract
Three simply‐supported 1.5 m (60 in.) square, 60 mm (2.4 in.) thick under‐reinforced prestressed concrete slabs, with corners held down, have been tested to failure under centrally applied concentrated loading. Prestressing was applied eccentrically in both directions by straight bonded 7 mm (0.24 in.) or 5 mm (0.20 in.) diam wires. The concrete cube strength ) and diam of the loading platen (152 mm—6 in.) were kept constant while steel ratio was varied. Measurements of concrete strains, steel strains, slab deflections and corner reactions were taken during the tests. Final failure of each slab was by punching either along, or at a distance from the perimeter of the platen after the development of the yield‐line mechanism. It is shown that the collapse load can be predicted reasonably by the load required for fan mechanism development. For a slab with corners held down, but without corner‐lever reinforcement, it is shown that the yield load can only be predicted and distinguished from a similar one with corners allowed to lift, by taking into consideration the flexural strength of concrete across the corner lever.
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References
1.
ACI 318‐77, Building Code Requirements for Reinforced Concrete, American Concrete Institute, Michigan, 1977.
2.
BS 1881, Part 3: Methods of Making and Curing Test Specimens, British Standards Institute, London, Engand, 1970.
3.
Brotchie, J. F., and Beresford, F. D., “Experimental Study of a Prestressed Concrete Flat Plate Structure,” Civil Engineering Transactions, Institute of Engineers, Australia, CE9, No. 2, Oct., 1967, pp. 276–282.
4.
CP110, The Structural Use of Concrete: Part 1: Design Materials and Workmanship, British Standards Institution, London, England, 1972.
5.
Johansen, K. W., Brudlinietedrier, Copenhagen, Denmark, 1943; English Ed., Yield‐Line Theory, Cement and Concrete Association, London, England, 1962, p. 181.
6.
Lin, T. Y., “Load‐Balancing Method for Design and Analysis of Prestressed Concrete Structures,” Journal of the American Concrete Institute, Vol. 60, No. 6, June, 1963, pp. 719–742.
7.
Okafor, H. O., “Bonded Prestressed Concrete Square Slabs Subjected to Concentrated Loading,” thesis presented to the Imperial College, University of London, in 1981, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
8.
Okafor, H. O., and Perry, S. H., “Post‐Yield Behaviour of Bonded Prestressed Concrete Square Slabs Subjected to Concentrated Loading,” The Structural Engineer, Vol. 60B, No. 2, June, 1982, pp. 21–33.
9.
Reynolds, G. C., “The Strength of Right Prestressed Concrete Slab Bridges with Edge Beams,” Magazine of Concrete Research, Vol. 9, No. 27, Nov., 1957, pp. 141–144.
10.
Scordelis, A. C., Lin, T. Y., and Haya, R., “Behaviour of a Continuous Slab Prestressed in Two Directions,” Journal of the American Concrete Institute, Vol. 56, No. 6, Dec., 1959, pp. 441–459.
11.
Scordelis, A. C., Lin, T. Y., and May, H., “Shearing Strength of Reinforced Prestressed Lift Slabs,” Journal of the American Concrete Institute, Vol. 55, No. 4, Oct., 1958, pp. 485–506.
12.
Scordelis, A. C., Pieter, K. S., and Lin, T. Y., “Strength of a Concrete Slab Prestressed in Two Directions,” Journal of the American Concrete Institute, Vol. 53, No. 3, Sept., 1956, pp. 241–256.
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Copyright © 1985 ASCE.
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Published online: Feb 1, 1985
Published in print: Feb 1985
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