Experimental Investigation of Flat Plate Floors


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Title: Experimental Investigation of Flat Plate Floors

Author(s): Israel Rosenthal

Publication: Journal Proceedings

Volume: 56

Issue: 8

Appears on pages(s): 153-166

Keywords: none

Date: 8/1/1959

This preliminary investigation was carried out on cir- cular slabs, loaded centrally and eccentrically, represent- ing the most dangerous portion of the flat plate floor a- round the supporting column. Eleven slabs in two sizes, 45 in. (116 cm) and 67 in. (170 cm) with a uniform thickness of 4 in. (10 cm), were tested and failed either in punching or in flexure. Shear reinforcement was found highly effective in preventing punching failure, which shows that thin, resistant slabs can be designed with the use of round bar reinforcement. to reduce ultimate strength. Eccentric loading tends Hognestad’s empirical equation, which considers the combined effect of shear and flexure in a centrally loaded slab, was used for slabs containing tension reinforcement only, resulting in satisfactory agreement with test data. For these latter slabs diagonal tensile stresses were computed directly, taking into consideration the detached concrete cone of punching.