Title:
Re-Examination of Spiral Steel Requirements
Author(s):
William L. Gamble
Publication:
Concrete International
Volume:
8
Issue:
11
Appears on pages(s):
33-34
Keywords:
DOI:
Date:
11/1/1986
Abstract:
The ACI Building Code Eq. (10-5) governs the minimum amount of spiral reinforcement required in a spiral column. The intent of the requirement is that the column be able to fail in a ductile manner, and the method of reaching this behavior was to cause the failure load, after spalling of the shell, to be slightly higher than the load causing the shell to start to spall. In the derivation of the equation, a small term was omitted, with the result that small, heavily reinforced columns may not satisfy the original criterion, and consequently may be considerably less ductile than expected. A modified Eq. (10-5) is suggeste, and a second related design concern is discussed.