Seismic Performance of Exterior Steel Ring-Stiffener Joint

Table 4

Key points and ductility index.

Specimen	Force direction	Yield load Py (kN)	Yield displacement (mm)	Peak load Pu (kN)	Peak displacement (mm)	Ductility index	Average value
SJD-1	+	17.1	16.8	23.9	34.6	2.06	1.90
	−	−26.5	−17.5	−31.3	−30.6	1.75
SJD-2	+	19.4	15.8	27.6	40.6	2.57	2.47
	−	−28.3	−15.4	−34.9	−36.5	2.37
SJD-3	+	18.5	17.1	25.7	34.6	2.03	2.03
	−	−28.5	−15.0	−35.0	−30.6	2.04
SJD-4	+	19.6	14.8	27.1	35.6	2.41	2.31
	−	−28.0	−16.4	−34.9	−36.5	2.22
SJD-5	+	31.0	15.0	43.6	28.7	1.91	1.98
	−	−39.0	−17.8	−49.8	−36.5	2.05
SJD-6	+	13.4	16.1	20.3	39.0	2.42	1.90
	−	−30.8	−13.3	−33.5	−18.0	1.36
SJD-7	+	18.2	22.8	21.1	39.0	1.72	2.10
	−	−15.8	−16.4	−22.2	−40.9	2.49

Note. “+” denotes positive direction, and “−” denotes the negative direction.