Experimental and Theoretical Research on Shear Strength of Seismic-Damaged SRC Frame Columns Strengthened with Enveloped Steel Jackets

Table 1

Characteristic points of backbone curves.

Specimen	Vcr (kN)	Vy (kN)	∆y (mm)	Vu (kN)	∆u (mm)	Vmax (kN)	∆max (mm)	µ (∆u/∆y)	E
SRC-0	37.22	117.43	16.45	131.00	47.67	111.35	26.80	2.89	0.44
		−119.11	−16.89	−133.01	−48.03	−113.06	−25.93	2.84
WSRC-0	44.32	140.19	17.36	161.14	58.99	136.97	27.86	3.40	0.53
		−141.88	−17.41	−162.92	−59.17	−138.48	−28.01	3.40
WSRC-1	40.05	126.82	16.64	148.04	53.58	125.83	27.14	3.22	0.49
		−124.12	−16.34	−143.89	−53.08	−122.31	−26.94	3.25
WSRC-2	39.62	121.09	16.60	140.80	51.46	115.46	27.02	3.10	0.46
		−119.87	−16.27	−138.76	−50.21	−117.95	−26.47	3.09