Cyclic Behavior of Square CFST Columns-Based Joint
Table 4
Main performance points.
Specimen No.
Loading direction
Ke (kN/mm)
Py (kN)
△y (mm)
Pp (kN)
△p (mm)
Pmax (kN)
△max (mm)
No. 1
Positive
17
184
16.3
204
20.6
231
43.7
Negative
13
−206
−21.6
−218
−23.6
−223
−45.0
No. 2
Positive
18
296
21.9
311
23.7
345
60.6
Negative
17
−316
−27.2
−320
−28.1
−382
−68.9
No. 3
Positive
14
182
22.6
188
25.5
222
52.8
Negative
11
−181
−26.4
−197
−34.9
−229
−53.4
No. 4
Positive
13
244
32.8
254
34.1
273
84.4
Negative
13
−220
−27.1
−247
−34.5
−269
−75.6
No. 5
Positive
16
217
12.8
284
27.8
306
30.0
Negative
11
−239
−24.4
−254
−29.4
−271
−30.4
No. 6
Positive
21
225
15.5
270
24.3
299
48.9
Negative
14
−275
−27.3
−290
−31.6
−298
−34.6
Note: Ke is initial stiffness, Py is yield loading force, Pp is plastic loading force, Pmax is maximum loading force, △y is yield displacement, △p is plastic displacement, and △max is displacement of Pmax.