Title:
Strength of Short and Long Concrete-Filled Tubular Columns
Author(s):
Weizi Zhang and Bahram M. Shahrooz
Publication:
Structural Journal
Volume:
96
Issue:
2
Appears on pages(s):
230-238
Keywords:
capacity; columns (supports); composite construction (concrete and steel); high-strength concretes; short columns; specifications; strength; structural analysis; structural design
DOI:
10.14359/614
Date:
3/1/1999
Abstract:
Using experimental data from previous tests and detailed analytical studies, the applicability of ACI standard techniques for analysis of concrete-filled tubular columns is evaluated. Both short and slender columns are considered. The focus of the reported research is on rectangular and square normal or high-strength steel tubes filled with normal or high- strength concrete. Capacity of short concrete-filled tubular columns is predicted reasonably well by the ACI method as long as normal strength tubes are used. However, this procedure tends to significantly underestimate the capacity for cases with high-strength tubes. In lieu of fiber analysis, the ACI method should be revised to incorporate full yielding of the steel tube. The results, as obtained by ACI or its revised method, are fairly close to those obtained from more refined fiber analysis. Capacity of slender concrete-filled tubular columns is also computed reasonably well by the ACI moment magnifier method. The results correspond to those obtained from second-order analyses in which material and geometric nonlinearities are incorporated. Therefore, the ACI procedure provides a simple yet reliable method for analysis of short and slender concrete-filled tubular columns if appropriate measures are made for cases with high- strength tubes.