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Investigation of Seismic Response of Circular-Plan Concrete Funicular Shells

Seyed Mohamadi Shal, Mohamad Mahdi | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53258 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s):
  7. Abstract:
  8. The present study considers the performance of circular-plan concrete funicular shells due to seismic loads for simply boundary conditions. Vibration frequencies of these shells along with their seismic responses included displacement and stresses generated in them due to the acceleration components of Tabas and Manjil earthquakes are determined via the use Abaqus software. Frequencies of vibration determined with software are compared with the results of a semi-analytical model where good agreement is achieved.The results of the performed analyses for vibration frequencies show that both of the reduction of the base diameter and the incerese of the rise increase the frequencies of vibration, however nonlinearly for the former one and linearly for the latter one. Also, seicmic responses indicate that low displacement and compressive and tensile stresses are generated in funicular shells due to both considered earthquakes and the assumption of linearly elastic behavior of material in analysis is generally correct.The results show a decrease in displacement and stresses values with increasing the rise and this highlighted the importance of choosing the right geometric characteristics of the shell. Only for a number of the studied shells, in the area of the top of the shell up to one tenth of the radius of the plan, the maximum tensile stresses created in the shell are greater than the tensile strength of concrete and the need for reinforcement in this area is observed. In addition, the effect of the opening on the seismic performance of these shells is investigated and it is observed that the presence of the opening in any form increases the amount of displacement and the maximum amount of stress. Of course, the important point is that for the shells, despite the openings examined, the maximum displacement and the maximum compressive and tensile stresses do not increase in such a way that the use of linear elastic analysis is not allowed
  9. Keywords:
  10. Vibrational Frequency ; Lagrange Equation ; Finite Element Method ; Seismic Response ; Funicular Shells ; Elastic Analysis

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