Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Table 3

Specimen parameters and comparison of ultimate bearing capacity.

Specimens	e (mm)	u	L (mm)	D (mm)	t (mm)	fy (MPa)	fyz (MPa)	fyh (MPa)	fc (MPa)	Put (kN)	Puf (kN)	Puf/Put	Loading methods	Data sources
C2R	—	0.06	1220	610	4.8	348	324	359	34	734	639	0.87	Horizontal shear	Literature [41, 42]
C4R	—	0.06	1220	610	4.8	348	324	324	35	957	813	0.85
C6R	—	0.18	1220	610	3.2	286	469	324	40	1024	850	0.83
C8R	—	0.18	915	610	3.2	286	469	324	31	1228	1105	0.90
ZY2-1	—	—	1200	280	4.0	433	400	380	36	4358	3879	0.89	Axial compression	Literature [45]
ZY2-2	—	—	1200	280	4.0	433	400	380	36	4594	4181	0.91
ZY3-1	—	—	1200	280	4.0	433	400	380	36	4700	4277	0.91
ZY3-2	—	—	1200	280	4.0	433	400	380	36	4581	4260	0.93
CTRC-60-8	—	0.8	1200	226	2.7	436	506	305	53	232	218	0.94	Horizontal circulation	Literature [68]
CTRC-60-6	—	0.6	1200	226	2.7	436	506	305	53	199	186	0.93
CTRC-60-3	—	0.3	1200	226	2.7	436	506	305	53	139	133	0.96
CTRC-30-8	—	0.8	1200	226	2.7	436	506	305	39	164	150	0.92
C200-6-25-a	25	—	1200	200	1.5	364	477	286	56	1926	1887	0.98	Eccentric compression	Literature [69]
C200-6-25-b	25	—	1200	200	1.5	364	477	286	56	1758	1688	0.96
C200-6-50-a	50	—	1200	200	1.5	364	477	286	56	1317	1225	0.93
C200-6-50-b	50	—	1200	200	1.5	364	477	286	56	1238	1201	0.97
C200-10-25-a	25	—	2000	200	1.5	364	477	286	56	1602	1522	0.95
C200-10-25-b	25	—	2000	200	1.5	364	477	286	56	1520	1490	0.98
C200-10-50-a	50	—	2000	200	1.5	364	477	286	56	1121	1054	0.94
C200-10-50-b	50	—	2000	200	1.5	364	477	286	56	1136	1102	0.97
C240-6-25-a	25	—	1440	240	1.5	364	477	286	56	2518	2468	0.98
C240-6-25-b	25	—	1440	240	1.5	364	477	286	56	2464	2292	0.93
C240-6-50-a	50	—	1440	240	1.5	364	477	286	56	1957	1879	0.96
C240-6-50-b	50	—	1440	240	1.5	364	477	286	56	1872	1685	0.90
C240-10-25-a	25	—	2400	240	1.5	364	477	286	56	2219	2175	0.98
C240-10-25-b	25	—	2400	240	1.5	364	477	286	56	2212	2124	0.96
C240-10-50-a	50	—	2400	240	1.5	364	477	286	56	1909	1756	0.92
C240-10-50-b	50	—	2400	240	1.5	364	477	286	56	1687	1653	0.98

Note. e is the eccentricity; u is the axial compression ratio; L, D, and t represent the steel pipe length, outer diameter, and wall thickness, respectively; f_y, f_yz, and f_yh are the measured yield strength of steel pipe, longitudinal bar, and stirrup, respectively; f_c is the compressive strength of concrete; P_ut represents the test value of bearing capacity; P_uf is the FEM simulation value of bearing capacity.