Optimal Location of Multiple Tuned Mass Dampers in Regular and Irregular Tall Steel Buildings Plan

Table 6

Modal properties of structure [40].

Mode no., i	1	2	3
Frequency, fi (Hz)	2.743	9.45	18.84
Normalized mode shape, Φi
Damping ratio, (%)	0.48	1.15	1.45
Participation factor,	33.904	8.293	−2.863
Orthogonality with respect to mass matrix,