Title:
Response of Circular Reinforced Concrete Columns to Multi-Directional Seismic Attack
Author(s):
Yuk-Lung Wong, T. Paulay, and M. J. Nigel Priestley
Publication:
Structural Journal
Volume:
90
Issue:
2
Appears on pages(s):
180-191
Keywords:
axial loads; columns (supports); compression; ductility; displacement pattern; earthquake-resistant structures; reinforced concrete; shear strength; spiral reinforcement; tests; Structural Research
DOI:
10.14359/4124
Date:
3/1/1993
Abstract:
Sixteen circular reinforced concrete column models with aspect ratio of 2 and different spiral reinforcement contents were tested to investigate the sensitivity of the strength and stiffness of shear-resisting mechanisms to various displacement patterns and axial compression load intensities. Shear deformations were expected to be significant for these squat columns, particularly under low axial compression. The hysteretic performance and displacement ductility capacity of the columns were improved by increased spiral steel content or by increased axial compression. In comparison with uniaxial displacement paths, biaxial displacement patterns led to more severe degradation of strength and stiffness. However, the displacement ductility capacity was not sensitive to the type of biaxial pattern. Simple orthogonal displacement patterns were found to be sufficient to represent horizontal two- dimensional seismic effects. Current code provisions were found to underestimate the shear strength of circular columns. A shear design procedure which enables the shear strength-displacement ductility relationship to be estimated, while also including the effects of displacement history, is proposed.