Load Transfer from High Strength Concrete Interior Columns through Ordinary Strength Concrete Slabs

Abstract

Nine interior slab-column specimens were tested to investigate the effects on high strength concrete columns, due to the presence of ordinary strength floor concrete layer in between the columns. The 28 and 30 inches long columns had a floor slab of varying thickness i.e. 3.0, 4.5 and 6 inches. The slab extended beyond the column faces in four directions. These column specimens were designed to study the influence of longitudinal as well as lateral steel on the strength characteristics and behavior of the floor concrete. The data from these tests combined with the previously reported similar studies was analyzed to find the appropriate parameters for the estimation of the apparent strength of the floor concrete to be used in calculation of load carrying capacity of columns. Mechanics of materials approach used for the analysis of the composite materials, as proposed by Kayani in his research, was applied for the theoretical analysis of the problem. This approach with the use of the available test data lead to an expression for the calculation of the apparent floor concrete strength.