Effect of Floor Concrete Strength on Column Strength

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Title: Effect of Floor Concrete Strength on Column Strength

Author(s): Albert C. Bianchini, Robert E. Woods, and Clyde E. Kesler

Publication: Journal Proceedings

Volume: 56

Issue: 5

Appears on pages(s): 1149-1170

Keywords: none

Date: 5/1/1960

Abstract:
Forty-five specimens representing portions of the corner, edge, and interior column and floor sections of a typical structure were tested under axial compressive loads and the results analyzed to determine the following: (1) how large a differential in column concrete strength and floor concrete strength could be tolerated without decreasing the load-carrying capacity of the column, and (2) the allowable load-carrying capacity of the column if this differential is exceeded. The followina variables were included: type of specimem, column concrete strength, and floor concrete strength. From the analysis of the test results, a procedure was developed for computing the ultimate load of a column in which the column concrete is intersected by floor concrete. These limited tests indicated that the column strength is a function of the ratio of column concrete strength to floor concrete strength and the number of restrained edges tributary to the column. No reduction in column strength occurred for ratios of column concrete strength to floor concrete strength up to 1.4 for all types of specimens and up to 1.5 for most types of specimens.