High-Strength Concrete Used in Composite Columns


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Title: High-Strength Concrete Used in Composite Columns

Author(s): K. Cederwall, B. Engstrom, and M. Grauers

Publication: Special Publication

Volume: 121


Appears on pages(s): 195-214

Keywords: columns (supports); composite construction (concrete and steel); confined concrete; ductility; eccentric loads; high-strength concretes; pipe columns; shear properties; tests; Structural Research

Date: 11/1/1990

The results of 18 tests on slender composite columns consisting of rectangular hollow steel sections filled with concrete are presented. The columns had a length of 3 m and a cross section of 120 x 120 mm. They were simply supported and the load was normally applied with an eccentricity of 20 mm. As a reference, the squash load was evaluated with tests on short columns (stub tests). The purpose of this study was to evaluate the possible advantages of high-strength concrete, confining effects of composite sections, and the shear transfer at the interface. Basic parameters that varied between the tests were: concrete compressive strength, steel yield stress, and thickness of the steel tube. In additional tests, the effect of load eccentricity, additional reinforcement in the column, debonded interface, and the way of load application were examined. These tests showed that the load-bearing capacity, as well as the ductility in the ultimate state, increased for these eccentrically loaded columns.