New damping model available to time history response analysis

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For dynamic analysis such as the earthquake response analysis of buildings, the selection of damping model is a very important problem. It is well known that the damping ratios (h) of many materials are almost constant against the frequency, generally. However, there is no practical model which can express those characteristics and be available for large scale 3 dimensional FEM models. This researcher has studied the time domain transform method of strong frequency dependent functions, and proposed highly accurate and practical damping model (Causal hysteretic damping model). In this study, this model is improved and optimized. Moreover, more efficient new damping model (Updated Rayleigh damping model) is proposed.