Cyclic Load Responses of GFRP-Strengthened Hollow Rectangular Bridge Piers

Table 1

Properties of the bridge pier specimens.

Specimen; number	Height/mm	Longitudinal bar		Stirrup bar		Confined height/mm	GFRP; (cloth ratio)	Axial load; ratio
		Diameter	Reinforcement ratio	Diameter and spacing	Volumetric ratio
SU-1	1400		1.05%	6 at 100	0.49%	0	—	0.2
SHG-2	1400		1.05%	6 at 100	0.49%	500	0.40	0.2
SHG-3	1400		1.05%	6 at 100	0.49%	500	0.61	0.2
LU-1	2800		1.05%	6 at 100	0.49%	500	—	0.2
LHG-2	2800		1.05%	6 at 100	0.49%	500	0.40	0.2
LHG-3	2800		1.05%	6 at 100	0.49%	500	0.61	0.2

Note: (a) S() stands for slenderness ratio .
(b) U denotes standard specimens without GFRP.
(c) HG denotes GFRP’s sheet circular confinement, in which the number is GFRP layers.
(d) GFRP (cloth ratio): cloth ratio can be expressed by Ac/As, where Ac is the area of GFRP for each section and as is the area of cross section.