Experimental Model for Double Concave Sliding Bearings

This study focuses on the performance of sliding friction seismic base isolation systems. Full-scale mono-directional tests are performed on double concave friction bearings in accordance with ASCE7-10 testing protocols. An existing experimental model for a single pendulum isolators is extended to double concave sliding bearings. The friction coefficient model is represented in terms of the applied vertical load, velocity, and cycling. Independent functions for each of these effects are calibrated and validated using test data to represent the observed variations in variations in friction coefficient. The applicability of the model to the double concave isolators is discussed, in comparison with earlier results on the single concave isolators. The feasibility of use of experimental data from current testing protocols for the calibration of the model is also addressed, and recommendations are provided.