Strength of Concrete Filled Steel Tubular Columns

by Robert B. Knowles,
Robert Park,

Serial Information: Journal of the Structural Division, 1969, Vol. 95, Issue 12, Pg. 2565-2588

Document Type: Journal Paper


The ultimate strength of axially and eccentrically loaded steel tubular columns covering a wide range of slenderness ratios was investigated. Hollow steel tubes were tested and compared with concrete filled steel tubes. It was found that the buckling load of the axially loaded long columns can be accurately predicted by summing the tangent modulus loads for the steel tube and the concrete core acting as independent columns. The effect of slenderness ratio on the lateral pressure exerted by the tube on the concrete was examined. Lateral pressure is exerted when the concrete commences to increase in volume at high strains and results in an increase in strength of the concrete. Buckling will occur before the longitudinal strain becomes sufficiently high to cause the concrete to increase in volume. For eccentrically loaded columns constructed from steel tubes infilled with concrete, it was found that a straight line interaction formula using the ultimate axial load and the ultimate flexural capacity of the sections predicted failing loads.

Subject Headings: Axial loads | Steel columns | Concrete | Load bearing capacity | Ultimate loads | Tubes (structure) | Lateral pressure | Failure loads

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