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Effect of Vertical Component of Earthquake on Cable-stayed Bridges

Babaei Ravandi, Behnam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44835 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Cable stayed bridges have been used extensively in recent years for long span bridges up to 1000m. Although seismic behavior of these bridges has been researched in the last decade, however, the effect of vertical component of earthquake on cable-stayed bridges has not been studied before. In this thesis, the geometric nonlinear static analyses on dead loads followed by linear direct integration dynamic analyses have been used to study this effect. The results of analyses with three-component earthquakes are compared with two-component earthquakes. Fourteen models of cable-stayed bridges with different main span length, shape of pylons and the deck-pylon connection are employed. The errors of not considering the vertical component of earthquakes are calculated for cable forces, maximum deck forces and the base reaction of pylons. The shorter cables had the highest errors. The shear and moment of the weak direction of pylons and deck and the deck torsional moments were found to be not affected with elimination of vertical component of earthquakes. In the deck, axial compression in the deck-pylon connection and axial tension in the middle of the main span were found to be greatly affected. The shear and moment of the strong direction of deck and pylons had less error than the axial forces. It is concluded that the vertical component of earthquakes should be considered in cable-stayed bridge seismic analysis
  9. Keywords:
  10. Seismic Assessment ; Cables Stayed Bridges ; Vertical Component of Earthquake Effect ; Nonlinear Time History Analysis

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