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An Investigation on the Effect of Design Parameters on Behabior of Prestressed Ring-Shaped Steel Structures

Dabaghian Torghabeh, Jamal | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50367 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Purestekanchi, Homayoon
  7. Abstract:
  8. A tensile-compression ring is derived from the spoke wheel principle. The wheel is one of the greatest inventions in mankind. The use of the wheel has developed through time. Engineers found out that the use of the spoke wheel as a roof structure provides many benefits. With the spoke wheel principle a lightweight, cost-efficient roof structure can be made. In recent years the spoke wheel principle has also been applied for oval shaped roofs in order to increase the application of the principle. An example is the use of the roof structure for football stadia. The problem is that the spoke wheel principle will only work at full extend when its shape is completely circular. The question rises if the use of a spoke wheel principle for football stadia roof structure is still attractive? In this thesis a study is made for the use of the spoke wheel principle for football stadia. The research question is as followed: ‘To what extend is the application of the spoke wheel principle feasible and efficient for football stadia roof structures?’ A spoke wheel consists of three elements: the rim, the hub and the spokes that connect the ring and hub. The interaction between these elements is what makes the spoke wheel so special. The strength and stiffness of the wheel depends on the amount of ring action of the structure. To provide ring action the rim must be compressed, for instance by pre-tensioning the spokes. When radial tensile forces act on the rim, the rim becomes compressed due to curvature of the rim. The higher the pre-tension in the spokes, the more compression forces arise, the stronger and stiffer the wheel becomes. There are other parameters that affect the strength and stiffness of the wheel that we will discuss in this research
  9. Keywords:
  10. Structural Optimization ; Pretension ; Ring-Shaped Steel Structure ; Geometric Stiffness ; Cable Structures

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