Title:
Confined Concrete Columns Subjected to Axial Load, Cyclic Shear, and Cyclic Flexure—Part I: Analytical Models
Author(s):
Thomas G. Harmon, Nathan C. Gould, Seetharaman Ramakrishnan, and Edward H. Wang
Publication:
Structural Journal
Volume:
99
Issue:
1
Appears on pages(s):
32-41
Keywords:
column; confined concrete; reinforced concrete; shear fatigue.
DOI:
10.14359/11033
Date:
1/1/2002
Abstract:
Part I of this paper presents a series of material and structural models for predicting the behavior of circular confined concrete columns subjected to constant axial load, cyclic shear, and flexure. In addition, a simplified model is presented that may be more suitable for design. Part II presents experimental verification from tests of cantilever concrete columns confined with fiber-reinforced plastic (FRP). Both the detailed series of models and the simplified model predict the experimental results with reasonable accuracy. The detailed series of models attempt to explain the behavior of circular concrete columns wrapped with FRP using elementary principles of mechanics. Critical predicted behavior includes wrap strains, force-deflection relationships, and failure modes. Analytical results using the detailed series of models together with experimental results presented in Part II are then used to examine the validity of six of the assumptions that are the basis of current design procedures for confined concrete columns. The results from this process suggest that the six assumptions are not always consistent with the behavior. Unfortunately, the detailed model is cumbersome to apply and requires extensive iteration. The simplified model is proposed as the basis of future design procedures.