Assessing Seismic Performance of Gantry Crane Subjected to Near-Field Ground Motions Using Incremental Dynamic and Endurance Time Analysis Methods

Table 5

Aseismic ratio of viscous dampers at three typical times.

Damage index	Time (s)	(%)	(%)	(%)
Lateral LDR	10	0.37	0.05	87
	20	0.8	0.07	92
	30	0.8	0.09	89
Vertical LDR	10	0.53	0.18	66
	20	0.7	0.21	70
	30	0.92	0.22	76