Title:
Lateral Load Behavior of Reinforced Concrete Columns Constructed Using High-Strength Materials
Author(s):
John H. Thomson and John W. Wallace
Publication:
Structural Journal
Volume:
91
Issue:
5
Appears on pages(s):
605-615
Keywords:
axial loads; beam-column frame; beams (supports); buckling; columns (supports); confined concrete; ductility; earthquakes; earthquake-resistant structures; high-strength concrete; reinforced concrete; Structural Research
DOI:
10.14359/4181
Date:
9/1/1994
Abstract:
The paper summarizes results of an experimental and analytical study of reinforced concrete columns constructed with high-strength materials and subjected to simulated seismic loadings. The primary objective of the study was to investigate the suitability of using high-strength concrete columns in regions of moderate-to-high seismic risk. The experimental program consisted of testing 12, approximately quarter-scale, rectilinearly confined, high-strength reinforced concrete columns with concrete compressive strengths of approximately 12 ksi. The primary variables of the testing program were: the spacing, configuration, and yield strength of the transverse reinforcement; and the level of axial stress acting on the column. Experimental and analytical results indicate substantial column deformation capacity with no decrease in flexural strength up to a lateral drift level of 2, and that the use of high-yield-strength transverse reinforcement without a well-defined yield plateau provides more effective confinement than Grade 60 reinforcement. An analytical model for stress-strain of high-strength concrete is evaluated, and code provisions for buckling of longitudinal reinforcement are investigated.