Parametric Study on the Seismic Response of Steel-Framed Buildings with Self-Centering Tension-Only Braces

Table 2

Comparison of modal analysis.

	BRBFs				SC-TOBFs
Story number	9		16		9		16
Model	3D	2D	3D	2D	3D	2D	3D	2D
Mode 1	1.820 s	1.784 s	2.638 s	2.583 s	2.729 s	2.696 s	3.579 s	3.508 s
MPMR	0.780	0.777	0.737	0.737	0.790	0.790	0.765	0.769
Mode 2	0.652 s	0.639 s	0.903 s	0.886 s	0.955 s	0.945 s	1.208 s	1.190 s
MPMR	0.140	0.143	0.160	0.160	0.120	0.120	0.128	0.130
Mode 3	0.368 s	0.361 s	0.497 s	0.490 s	0.551 s	0.547 s	0.677 s	0.674 s
MPMR	0.042	0.042	0.045	0.045	0.040	0.040	0.041	0.042

MPMR: modal participating mass ratio.