Shearing Strength of Prestressed Lift Slabs*


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Title: Shearing Strength of Prestressed Lift Slabs*

Author(s): A. C. Scordelis, T. Y. Lin and H. R. Mayo

Publication: Journal Proceedings

Volume: 55

Issue: 10

Appears on pages(s): 485-506

Keywords: no keywords

Date: 10/1/1958

A research investigation on the ultimate shearing strength of reinforced and prestressed concrete lift slabs included the testing of 15 slabs, 12 of which were prestressed with unbonded cables. All specimens were 6 ft square and had thicknesses of 6,8, or 10 in. The slabs were supported along all four edges and centrally loaded. Major variables were concrete strength, amount of prestressing or reinforcing steel, amount of initial prestress, size of steel collars, thickness of slab, and amount of collar recess. A comparison of the test results with expressions for ultimate shearing strength of reinforced concrete slabs proposed by Elstner and Hognestad and by Whitney indicate that these expressions, with proper interpretation, may also be used for the prestressed slabs included within this series of tests.