Title:
Seismic Performance of Steel-Encased Concrete Columns Under Flexural Loading
Author(s):
Philip F. Boyd, WilliamM F. Cofer, and David I. Mclean
Publication:
Structural Journal
Volume:
92
Issue:
3
Appears on pages(s):
355-364
Keywords:
columns (supports); composite construction (concrete and steel); confined concrete; ductility; earthquake-resistant structures; tests; flexural strength; reinforcing steels; shells (structural forms); Structural Research
DOI:
10.14359/1136
Date:
5/1/1995
Abstract:
The use of steel-encased concrete columns is a new trend in composite construction for buildings. Limited information is available on the experimental behavior of these columns when subjected to both general and seismic loading. An investigation of the flexural behavior of five steel- encased concrete columns when subjected to reversed cyclic lateral load and constant axial load is reported. The effects of varying thicknesses of steel shells, shells with and without shear studs attached to the interior surface, and normal and high-strength concrete cores were studied. Compared to conventionally reinforced concrete columns, the steel-encased concrete columns had similar load-displacement hysteretic behavior but exhibited greater energy- dissipation characteristics. The results show that the use of a thicker steel shell and shear studs increased the strength and energy dissipation in the composite columns. High-strength concrete in the column core resulted in higher ultimate strength but greater strength degradation and lower energy dissipation when compared to columns with normal strength concrete cores.