Title:
Experimental Studies on Full-Scale High-Strength Concrete Columns
Author(s):
Yan Xiao and Henry W. Yun
Publication:
Structural Journal
Volume:
99
Issue:
2
Appears on pages(s):
199-207
Keywords:
column; ductility; flexural strength; high-strength concrete.
DOI:
10.14359/11545
Date:
3/1/2002
Abstract:
Six full-scale high-strength concrete columns with compressive strengths of approximately 63 MPa were tested under cyclic lateral force and a constant axial load equal to 20 to 34% of the column’s axial load capacity. The 510 x 510 mm square columns were reinforced with four No. 29 (ASTM No. 9) and four No. 36 (ASTM No. 11) bars constituting a longitudinal steel ratio of 2.6% of the column cross-sectional area. The main experimental parameters were the transverse reinforcement detail and the axial load level. It was found that the hysteretic behavior and ultimate deformability of high-strength concrete columns were significantly influenced by the amount and details of transverse reinforcement in the potential plastic hinge regions as well as by the axial load level. Excellent hysteretic behavior that achieved a drift ratio of 6% without degradation of the load-carrying capacity was developed by columns with a transverse reinforcement not less than 82% of that specified in the seismic design provisions of ACI 318-99, when the axial load ratio was 20%. Similar columns, however, only achieved an ultimate drift ratio of 3% when the axial load was above 30% of the column’s axial load capacity. For the same transverse reinforcement configuration and testing condition, improved behavior was observed for the model column with higher-strength transverse reinforcement.