Hysteretic Behavior of High-Damping Rubber Bearings Under Non-Proportional Plane Loading

Abstract eng:
High-damping rubber (HDR) bearings have gradually become a commonly used type of seismic isolators worldwide. Because of the complex material compound, their actual hysteretic behavior is highly nonlinear and may not be very well represented by the existing bilinear approximation. In this study, first, a modified mathematical model is proposed for comprehensively characterizing the unilateral hysteretic behavior of HDR bearings under sinusoidal and triangular reversal loading. In addition to unilateral reversal loading tests, HDR bearings are tested with different non-proportional plane loading patterns, including circular and figure-eight orbits. It is found that under bilateral loading, the torsional coupling effect is significant on the mechanical properties and hysteretic behavior of HDR bearings. Therefore, integrating the threedimensional constitute law and the plane vector concept with the modified unilateral model, a further extended mathematical model for HDR bearings under non-proportional plane loading is developed. The accuracy and applicability of the modified and further extended mathematical models are verified through comparison with the test results.

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