Heat-Mechanics Interaction Behavior of Laminated Rubber Bearings under Large and Cyclic Lateral Deformation

Abstract eng:
Base-isolation devices attached to base-isolated buildings can be subjected to larger and more cyclic deformation than anticipated as a result of long-period ground motion caused by strong earthquakes occurring in oceanic trenches. For the lead rubber bearings (LRB) and high damping rubber bearings (HDB) of damping mechanisms, the seismic energy they absorb is fundamentally transformed into thermal energy, so heat is generated causing high temperatures in the lead plug and the high damping rubber. The deterioration of damping characteristics in line with rising temperatures is a serious concern, but there is a lack of experimental data on the relationship between increased temperatures and the mechanical characteristics of rubber bearings. Based on this background, dynamic loading tests were conducted using full-scale and reduced-scale rubber bearing specimens under large deformation conditions assuming long-period ground motion to ascertain the effects of increased temperatures on the mechanical behavior of rubber bearings. The results of tests show that the temperature of the lead plug shows a rapid increase, the hysteretic curve in the force-deformation relationship becomes smaller and the yield load becomes lower with cyclic loading.

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