Title:
Laterally Prestressed Eccentrically Loaded Slender Columns
Author(s):
Noel John Gardner, Ramkrishna Maruti Godse, and Tak-Fong Wong
Publication:
Structural Journal
Volume:
89
Issue:
5
Appears on pages(s):
547-554
Keywords:
buckling; columns (supports); confined concrete; loads (forces); prestressed concrete; rehabilitation; Structural Research
DOI:
10.14359/2979
Date:
9/1/1992
Abstract:
Concrete in a triaxial state of stress can withstand larger stresses and deformations than the same concrete in its unrestrained state. Wrapping concrete columns with wire under tension induces an active triaxial state of stress in the concrete, increasing its load-carrying capacity. An experimental investigation was carried out to evaluate the effects of load eccentricity, slenderness ratio, and initial lateral prestress on load capacity. Tests were carried out on 6-in. (150-mm) diameter columns with slenderness ratios of 16, 24, 36, and 48; loads were applied at eccentricities e/D of 0, 0.1, 0.25, and 0.5. Initial lateral concrete prestress of 0, 900, 1600, and 3200 psi (0, 6.2, 11.0, and 22.1 MPa) were used. Based on these test results and previous work, an empirical formula is proposed to predict the ultimate load of laterally prestressed slender concrete columns under eccentric load.