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|Title:||Sub-Structured Pseudodynamic Testing of Rate-Dependent Bridge Isolation Devices|
|Authors:||PALIOS Xenofon; MOLINA RUIZ FRANCISCO JAVIER; BOUSIAS Stathis; STREPELIAS Elias; FARDIS Michael|
|Citation:||Proceedings of the 2nd International Conference on Advances in Experimental Structural Engineering p. 262-269|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Institute:||Institute for the Protection and Security of the Citizen|
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