Effects of soil-structure interaction on dynamic characteristics of tank-liquid systems

ZHANG Rulin1 DI Qingshuang2 CHENG Xudong1 GUAN Youhai1

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 233-239.

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PDF(1818 KB)
Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 233-239.

Effects of soil-structure interaction on dynamic characteristics of tank-liquid systems

  • ZHANG Rulin1  DI Qingshuang2  CHENG Xudong1  GUAN Youhai1
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Abstract

Based on Lagrange method, a modal equation of a storage tank considering fluid-solid coupled effect was established. 6 numerical models including soil free site, pile foundation platform model, rigid foundation empty tank, rigid foundation full tank as well as empty tank and full tank considering soil-structure interaction (SSI) were established with software ANSYS. Natural frequencies of the site and influences of soil-structure interaction on dynamic characteristics of a tank system were obtained using computation results of 6 numerical models. The distribution of natural frequencies and each modal shape’s participation coefficients of various models were studied. The results showed that the existence of pile foundation platform makes the site’s first order natural frequency increase; SSI does not affect the slosh frequency of liquid in tank; after considering SSI, 3 types vibration frequencies including liquid convective sloshing frequencies, soil-tank-liquid whole vibration frequencies and tank-liquid coupled vibration frequencies appear, the first two order tank-liquid coupled vibration frequencies decrease and are more dense; SSI effect should be considered otherwise tank-liquid coupled vibration frequencies are over-estimated. Finally, the sub-structure theory was used to explain changes of dynamic characteristics of a tank system due to considering SSI, the suggestion for choosing Rayleigh damping coefficient of a tank-liquid system considering SSI was given in dynamic calculation. The study conclusions provided a reference for seismic response analysis of storage tank systems considering SSI.

Key words

storage tank / modal analysis / dynamic characteristics / SSI / tank-liquid coupled vibration

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ZHANG Rulin1 DI Qingshuang2 CHENG Xudong1 GUAN Youhai1 . Effects of soil-structure interaction on dynamic characteristics of tank-liquid systems[J]. Journal of Vibration and Shock, 2018, 37(7): 233-239

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