Precast Concrete Columns Strengthened with CFRP and GFRP Laminates under Eccentric Load Natawut Chaiwino, Jaturawit Sirimaha
Rajamangala University of Technology Thanyaburi
Abstract
—This paper presents the experimental results of
precast concrete columns strengthened and repaired with
externally bonded carbon fiber reinforced polymer (CFRP) and
grass fiber reinforced polymer (GFRP) laminates. The aims of
the study were to investigate the structural behaviors of a precast
concrete column with a notch and the efficiency of CFRP and
GFRP laminates in strengthening and repairing the columns
subjected to eccentric load. A total of 15 precast concrete
columns with notches were tested up to failure. Load was applied
on a column notch causing eccentric load on a column. The
specimens were equally divided into five groups based on the
types of fiber reinforced polymers and damage conditions of
columns (undamaged or partially damaged): columns with nonstrengthening/repairing; columns with CFRP strengthening;
columns with GFRP strengthening; columns with CFRP repair;
columns with GFRP repair. The results were compared and
discussed in terms of load carrying capacity, lateral deflection,
and mode of failure. It was concluded that the application of
CFRP and GFRP laminates in strengthening and repairing
precast concrete columns improved the load carrying capacities
up to 27.6%.
