Seismic Behavior of Posttensioned Concrete Bridge Piers with External Viscoelastic Dampers

Table 5

Maximum and RMS values of the base shear of the concrete pier (kN).

Direction	Earthquake record	Maximum (without damper)	RMS (without damper)	Maximum (with damper)	RMS (with damper)	Reduction of maximum (%)
Longitudinal	Northridge	1246	499	1133	524	9.1
	Loma Prieta	1706	457	1465	493	14.1
	San Fernando	1072	444	934	441	12.9
Transverse	Northridge	2443	911	1860	878	23.9
	Loma Prieta	2684	680	2243	723	16.4
	San Fernando	1797	803	1576	715	12.3