Title:
Seismic Design of Columns with High-Strength Wire and
Strand as Spiral Reinforcement
Author(s):
A. M. Budek, M. J. N. Priestley, and Chin Ok Lee
Publication:
Structural Journal
Volume:
99
Issue:
5
Appears on pages(s):
660-670
Keywords:
confinement; experimental; flexure; prestressing; reinforcement; shear
DOI:
10.14359/12306
Date:
9/1/2002
Abstract:
Nine model concrete bridge columns using prestressing strand as transverse reinforcement were tested to establish design parameters for the use of high-strength transverse reinforcement under seismic loading. Five of these columns were tested to examine shear behavior, and four were tested to examine flexural behavior. One shear test and two flexural tests were dynamic. Moderate volumetric ratios (less than half of the ATC-32-specified value for Grade 60) of high-strength steel provided satisfactory performance under shear-critical conditions. The confinement of flexural hinges was satisfactory at reinforcement levels below that called for by the California Department of Transportation Bridge Design Specifications, provided that the spiral pitch was small enough to prevent buckling of the longitudinal reinforcement. Dynamic loading did not have any unanticipated effect on either shear or flexural performance.