Application of Endurance Time Method in Nonlinear Dynamic analysis of Elevated Tanks

Rahmati, Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42121 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. Endurance Time (ET) is a fairly comprehensive analytical method based on time history analysis applied for evaluating structural systems excited by dynamic loading of earthquake. In such evaluation assessment measure is based on endurance time of structure versus applied accelerogram function and parameters such as stiffness, lateral resistance, period of vibration and dynamic characteristics are not used directly. In this research nonlinear dynamic analysis of elevated steel tanks with laterally braced framed tower under the loading of earthquake records and ET accelerograms was studied and effectivity of ET method in analyzing such elevated tanks was verified. Due to complication of modeling fluid and the fact that such analyses are time-consuming it seems necessary to find a simpler way in which the tank is analyzed fewer times to reach a suitable result with sufficient precision. With this point of view simpler models were analyzed and their results were compared with those of more complicated models. First, simplified model and finite element model of a ground supported steel tank were studied and their results were verified. Then for three types of elevated tanks of low, medium and high capacity the same analyses were done. All tanks were loaded by earthquake records and ET accelerograms. The results showed less discrepancy between values obtained for base shear, reaction moment and column force. However in some cases such as brace forces and story drifts more differences were noticed
  9. Keywords:
  10. Endurance Time Method ; Nonlinear Dynamic Analysis ; Elevated Tank ; Finite Element Model ; Simplified Two-Mass Model

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