A Procedure to Identify the Modal and Physical Parameters of a Classically Damped System under Seismic Motions

Table 9

Identified frequencies (Hz) and dampings (%) without and with optimization.

Modes	1	2	3	4	5
𝑓	1.252	4.015	7.499	11.828	16.518
𝑓^opt	1.252	4.014	7.499	11.828	16.517
𝜁	2.020	2.008	2.021	2.065	2.577
𝜁^opt	2.000	2.000	2.000	2.010	2.050