Title:
Behavior of Glass Fiber-Reinforced Polymer-Reinforced Concrete Columns Subjected to Simulated Seismic Load
Author(s):
Girish Narayan Prajapati, Ahmed Sabry Farghaly, and Brahim Benmokrane
Publication:
Structural Journal
Volume:
120
Issue:
1
Appears on pages(s):
3-16
Keywords:
concrete columns; deformability index; design codes; drift; energy dissipation; glass fiber-reinforced polymer (GFRP) reinforcement; hysteretic response; longitudinal and transverse reinforcement ratios; seismic loading
DOI:
10.14359/51737228
Date:
1/1/2023
Abstract:
This paper presents the results of an experimental study on
concrete columns reinforced with glass fiber-reinforced polymer (GFRP) reinforcement under simulated seismic load. The investigation included testing of eight full-scale square concrete columns reinforced with GFRP bars, spirals, and crossties and a cross section of 400 x 400 mm (15.8 x 15.8 in.) with a total height of 1850 mm (72.8 in.). The parameters studied were the longitudinal and transverse reinforcement ratios. The columns were reinforced with 12 longitudinal bars 15.9 and 19.1 mm (0.6 and 0.7 in.) in diameter. Spirals and crossties measuring 9.5, 12.7, and 15.9 mm (0.4, 0.5, and 0.6 in.) in diameter were used as transverse reinforcement. The specimens were subjected to cyclic lateral loading and constant axial loading of 20% of the capacity of the column. The test results indicate that the longitudinal and transverse reinforcement
ratios produced no significant changes in dissipated
energy. The spacing of the lateral reinforcement influenced column
strength and drift capacity at the lower longitudinal reinforcement
ratio but did not significantly affect the columns at the higher
longitudinal reinforcement ratio. The GFRP spirals and crossties
affected the lateral strength and deformability of the column after
spalling of the concrete cover. The displacement deformability
index computed at a concrete compressive strain of 3000 με showed
reasonably good prediction.