Seismic Behavior of Posttensioned Concrete Bridge Piers with External Viscoelastic Dampers

Table 4

Maximum and RMS values of the acceleration responses of the bridge deck (m/s²).

Direction	Earthquake record	Maximum (without damper)	RMS (without damper)	Maximum (with damper)	RMS (with damper)	Reduction of maximum (%)
Longitudinal	Northridge	7.12	1.33	7.03	1.36	1.26
	Loma Prieta	7.40	1.15	7.95	1.16	−7.43
	San Fernando	5.62	1.12	5.68	1.11	−1.07
Transverse	Northridge	7.64	1.66	7.23	1.69	5.37
	Loma Prieta	7.96	1.30	8.37	1.29	−5.15
	San Fernando	7.66	1.35	8.33	1.26	−8.75