Seismic Behavior of Posttensioned Concrete Bridge Piers with External Viscoelastic Dampers

Table 3

Maximum and RMS values of the displacement responses of the bridge deck (cm).

Direction	Earthquake record	Maximum (without damper)	RMS (without damper)	Maximum (with damper)	RMS (with damper)	Reduction of maximum (%)
Longitudinal	Northridge	12.0	3.9	9.5	3.6	20.8
	Loma Prieta	44.9	10.9	38.5	6.8	14.3
	San Fernando	6.6	2.2	6.3	2.1	4.5
Transverse	Northridge	12.7	3.6	10.8	2.8	15.0
	Loma Prieta	32.5	4.8	21.1	3.8	35.1
	San Fernando	7.8	2.1	6.4	1.7	18.0