Experimental Research on Square Steel Tubular Columns Filled with Steel-Reinforced Self-Consolidating High-Strength Concrete under Axial Load

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Experimental Research on Square Steel Tubular Columns Filled with Steel-Reinforced Self-Consolidating High-Strength Concrete under Axial Load

Author(s): W. Qing-xiang, Z. Mei-chun, and W. Hai-dan

Publication: Special Publication

Volume: 235

Issue:

Appears on pages(s): 89-102

Keywords: composite columns; high-strength concrete; self-consolidating concrete; steel section; steel tube; ultimate strength

Date: 3/22/2006

Abstract:
A new design model for steel-concrete composite columns, namely square steel tubular columns filled with steel-reinforced self-consolidating high-strength concrete, is proposed. In this type of steel-concrete composite columns, steel section is inserted into square steel tube and self-consolidating high-strength concrete is filled into the tube. Eighteen composite column specimens were tested under axial compression. Effects of the concrete strength, the width-to-thickness ratio, the length-to-width ratio, and the ratio of steel section on the strength and deformation characteristics of these composite columns are discussed. The experimental results indicate that the encased steel section can restrain the generation of diagonal shear cracks in the core concrete thus changing the failure mode and the post-yield behavior of short composite columns. The behavior of self-consolidating columns and vibrated columns is almost the same. The strength of the columns increases but the ductility decreases with the increase of concrete strength. Both the strength and ductility of the columns decrease with the increase of width-to-thickness ratio and length-to-width ratio. Formulas for calculating the ultimate strength of centrally loaded composite columns are proposed. The calculated values are in good agreement with the test results.