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Effect of Self-Heating of High Damping Rubber Bearings on Design Practice

Nguyen Anh Dung, Nguyen Tien Chuong and Yoshiaki Okui

Abstract


Traditional design guidelines generally assume uniform temperature distribution, and the value of design temperature is chosen to be the ambient temperature under which the rubber bearing is intended to operate. However, when high damping rubber bearings (HDRBs) are subjected to cyclic loads, the energy dissipated by the bearings is converted into heat and this heat causes significant temperature increase in the rubber bearings. This phenomenon is known as self-heating. The preliminary result of this topic is presented in a presentation at a conference [1]. This paper is devoted to investigate the self-heating effect on the design practice by conducting a seismic analysis of a single-span bridge at different ambient temperatures (23oC, -10oC, - 30oC). The inside temperature of HDRBs under earthquake Type-II increases about 10oC and 5oC at 23oC and -30oC ambient temperatures, respectively. Since the temperature increases during an earthquake is considered not so large as that during a cycling loading test in Nguyen et al (2013), a seismic model for HDRBs at low temperatures should be based on the inside temperatures. The design temperature of the model is chosen to be the inside temperature of the bearings in the selected cycle of the sinusoidal loading tests.

Keywords


high damping rubber bearings, self-heating, dissipated energy, seismic analysis

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