Study on Torsion Coupled Response of Non-Proportionally Damped Eccentrically Isolated Structure under Earthquake

Abstract eng:
This paper presents a numerical investigation into non-proportionally damped eccentric isolated structures. The non-proportional damping characteristics of the isolated system is described by Rayleigh’s sub-structural damping model, a simplified equation of motion (EOM) is derived. The result of the numerical simulation shows that the eccentricity ratio of the isolation layer has apparent effect on torsional angle of the isolation layer, while has little effect on the horizontal displacement of the isolation layer and the inter story drift of superstructure and the torsional angle of the isolated layer. The increase of the eccentricity ratio of the superstructure has little effect on the horizontal displacement and torsional angle of the isolation layer, but will result in an increase in the horizontal displacement and torsional angle of the superstructure. The extent of increase of the inter story drift and the torsional angle rises with the extent of increase of the eccentricity ratio. The response of structure can be decreased markedly by enhancing damping ratio of isolation layer properly, but excessive damping in isolation layer may cause the response of superstructure to increase.

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