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Title: Displacement-Based Design of Reinforced Concrete Columns for Confinement

Author(s): Murat Saatcioglu and Salim R. Razvi

Publication: Structural Journal

Volume: 99

Issue: 1

Appears on pages(s): 3-11

Keywords: column; ductility; confined concrete; displacement-based design; high-strength concrete; transverse reinforcement

DOI: 10.14359/11030

Date: 1/1/2002

Abstract:
A displacement-based design procedure was developed for confinement of earthquake-resistant concrete columns. The procedure is based on experimentally observed and analytically computed relationships among the parameters of confinement. The amount, grade, spacing, and arrangement of transverse reinforcement; concrete strength and cover thickness; and the level of axial compression and drift ratio were considered as parameters of confinement. Static inelastic (pushover) analyses were conducted to generate a large volume of data, with due considerations given to concrete confinement, reinforcement strain hardening and buckling, anchorage slip, axial compression, and secondary deformations due to P-D effect. Both normal-strength and high-strength concrete columns with circular and square cross sections were included. Improved design expressions were developed for column confinement utilizing both the current design criterion, which is based on column axial deformability, and the recommended design criterion, which is based on lateral deformability as expressed by column drift ratio.