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Seismic Behavior Evaluation of Anchored Cylindrical Fixed Roof Storage Tanks with Soil-Structure Interaction Effect

Rasoulbeigi Fard, Mohammad Reza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45728 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofouei, Fayyaz
  7. Abstract:
  8. The importance of the liquid storage tanks in this era is as much as their contained liquid that we use in our daily lives. Many studies have been carried out on these influential structures considering various aspects. The major damages inflicted to the liquid storage tanks in Loma Prieta, Lozan, Hokaido, Arzinkan, Northridge, Kobe, Izmit & Haiti Earthquakes, has led the researchers to perform various experimental and analytical studies on this regard in the last few decades. The most important part of a safe design of a storage tank is the accurate estimation of the seismically induced lateral forces that should be transferred to its base through the tank shell and its support. Moreover, the effect of rocking motion caused by the under laying soft soil, on its response parameters could be considerable. It should be noticed that arriving to an exact theoretical solution for the response of these tanks could be extremely difficult. Therefore, numerical methods such as finite elements methods have been very popular to determine the dynamic response of Tanks. In this study, a mathematical model is developed considering the fluid-structure-soil interactions for seismic analysis of 3-D, anchored storage tanks with fixed cone roof. In the numerical models, Arbitrary Lagrangian Eulerian (ALE) method is used to describe the liquid-structure interface. Two earthquake records, each with their three orthogonal components, as well as four soil types of the under-laying soil were considered in the numerical model. The obtained numerical results indicate that the pressure of tank shell is severely affected by under-laying soil type. Also, under the selected earthquake excitation, tank on softer soil has larger base shear force and over turning moment. In addition, by decreasing the height to the diameter ratio (H/D), distribution of pressure on flexible tank shell becomes closer to the pressure distribution of models with rigid tank shell
  9. Keywords:
  10. Soil-Structure Interaction ; Transmitting Boundaries ; Flexible Storage Tanks ; Fluid-Structure Interaction

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