SUB-STRUCTURED PSEUDODYNAMIC TESTING OF RATE-DEPENDENT BRIDGE ISOLATION DEVICES
Despite the continuous evolution of the pseudo- dynamic testing method, the unrealistic testing speed still constitutes a barrier when testing loading rate-sensitive devices. A special procedure accounting for the strain-rate effect of two different types of bridge isolation devices, is presented herein.The procedure consists of a series of simple, sinusoidal-type, characterization tests conducted at different speed, which ultimately yield appropriate force-compensation factors to compensate the, otherwise ignored, strain-rate effect. The procedure is applied to characterize the dynamic response of both, a low-damping elastomeric bearing isolator and a special electro-inductive energy dissipation device. The response of a multi-span, seismically isolated highway bridge is then experimentally studied by sub- structuring, with on-line correction of measured reaction forces to account for the velocity-dependent properties of the isolation devices. The experimental results obtained showed that the procedure can be employed to account for the force modification in testing rate-dependent isolation devices at reduced speed.
Bridges Base isolation Hybrid testing Isolation devices Sub-structuring Testing speed
Xenofon Palios Javier Molina Stathis Bousias Elias Strepelias Michael Fardis
University of Patras, Dept. of Civil Eng., Structures Laboratory, Greece European Commission, Joint Research Centre, ELSA Laboratory, Italy
国际会议
上海
英文
262-269
2007-12-04（万方平台首次上网日期，不代表论文的发表时间）