Experimental Research on Damping Effect of Double-Layer Tuned Mass Damper for High-Rise Structure

Table 7

First-order frequency of each model (Hz).

Model	Before the test	With DTMDs in different boundary conditions			After the test	DTMD	Case-III
		Case-III	Case-II	Case-I
First-order frequency	1.64	1.53	1.56	1.58	1.67	First-order frequency	1.60