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Date of Publication:2010-01-01

Journal:世界地震工程

Affiliation of Author(s):建设工程学部

Issue:2

Page Number:7-12

ISSN No.:1007-6069

Abstract:To meet the requirement of practical engineering design, a simplified numerical mechanical model is presented on the basis of the luoiped-mass model of a high-rise tower structure, in which main affecting factors on the structural dynamic responses are compared and investigated, such as various infinite base models, different water levels, and etc. By directly adding to the flexibility matrix of structure, a uniform processing method is also proposed for coping with the different soil condition models, namely, rigid foundation, Voigt elastic foundation and lumped-parameter model of infinite soil. The numerical models of soil in the practical example are shown that the Vogt elastic foundation model gives the upper bound of structural dynamic response, and the infinite soil model gives the lower bound. With small amount of computation required, the credible range of structural safety analysis can be easily confirmed based on the comparison of numerical results for different soil models, which also give strong supports for the design of structural necessary safety margin. The proposed simplified dynamic mechanical model can be expediently used to the dynamic interaction analysis of high tower structure-foundation-water system, which can be easily accepted by common engineers. So it can also be regarded as a symbol of the transition from the traditional design method to the modern design method with considering complicated factors.

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