Effect of Axial Compression Ratio on Seismic and Self-Centering Performance of Unbonded Prestressed Concrete Columns

Table 1

Design parameters of specimens.

Specimen number	Section size mm × mm	Concrete strength grade	Longitudinal reinforcement	Reinforcement ratio	Column stirrup	Prestressed tendons	Effective prestress	Shear span ratio
PTRC-1	300 × 300	C40	820	2.79	Φ8@50/100	-	-	3.5
PURC-1	300 × 300	C40	820	2.79	Φ8@50/100	4Φ^S15.2	0.65	3.5
PURC-2	300 × 300	C40	820	2.79	Φ8@50/100	4Φ^S15.2	0.65	3.5
PURC-3	300 × 300	C40	820	2.79	Φ8@50/100	4Φ^S15.2	0.65	3.5
PURC-4	300 × 300	C40	820	2.79	Φ8@50/100	4Φ^S15.2	0.45	3.5