Abstract
Abstract The full-scale measurements of damping show that damping in buildings exhibits randomness. The randomness of damping is examined in this paper. The factors which govern damping contributions in buildings, at different vibration amplitude levels, are investigated based on the Jeary's damping model [Earthquake Eng. Struct. Dyn. 14 (1996) 733–750]. It is found that, at a high amplitude level, damping in buildings is mainly dominated by random factors. In order to investigate the amplitude-dependent characteristics and randomness of structural damping, a time series analysis method (TSA) is employed to obtain the relationship between damping and vibrating amplitude. The AR (auto-regressive) models of damping in a building have been established and used to predict the damping values at high amplitude level, which are difficult to obtain from field measurements. The predicted data of damping show that damping values, at high amplitude, fluctuate around a plateau value described by Jeary's damping model.
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