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Evaluation of Foundation Flexibility on Seismic Performance of Anchored and Unanchored Aboveground Cylindrical Steel Tanks

Jahangiri Ali kamar, Meysam | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42363 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Amin
  7. Abstract:
  8. Liquid storage tanks are important components of lifeline and industrial facilities. Since,many tanks have borne serious damages during past earthquakes, Forcasting seismic behavior of tanks have attracted for numerous researchers who investigated seismic behavior of liquid storage tanks. This Thesis investigates the effects of slab foundation flexibility on seismic behavior of anchored and unanchored aboveground cylindrical steel storage tanks. In this study, finite elements method by ABAQUS software is used for three tanks with height to diameter ratios (H/D) of 0.343 , 0.85, and 1.53. These tanks are excited by seven one-way and three two-way earthquake records which were scaled to Iran 2800 earthquake code acceleration spectrum. In addition, direct method is used for modeling of soil, foundation, tank shell and water. Thus, soil-structure-fluid are considered. Also, drucker-prager model is used for soil modeling and, absorbent boundaries are modeled around the soil. Then, two different modulus of elasticity are used in order to considering the foundation flexibility, one for modulus of elasticity of concrete for rigid foundation case and the other for modulus of elasticity of soil for flexible foundation case. Thereby, the effects of the existence of foundation could be investigated, too. Finally, it is shown that the uplift and stresses in the tank wall in models with rigid foundation are less than models with flexible foundations. However, in the case of resulted free surface sloshing height, calculated values in two of the above conditions do not show significant differences
  9. Keywords:
  10. Liquid Storage Tanks ; Seismic Analysis ; Finite Element Method ; Foundation Fleaxibility ; Soil-Structure-Fluid Interaction

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