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Performance of lead-rubber and sliding bearings under different axial load and velocity conditions.

This report presents results from a series of tests on full scale devices for bridge applications. Lead-rubber bearings and sliding bearings were the two types of isolators considered in the tests. The objective was to achieve a clearer understanding of the devices' behavior under different loading conditions. Focus was on addressing the effects of the applied axial load, the varying levels of velocity and the repetition of cycles on the performance characteristics. The response variations were analyzed for different levels of applied vertical load based on the design load of the bearing. A wide range of testing velocities was applied. The study concludes with proposing a specific numerical model, for lead-rubber bearings, that is able to take into account the effects of strain rate and repetition of cycles.