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Effects of Concurrency of Temperature and Earthquake Loading on Cable-stayed Bridges

Maghsoudi-Barmi, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44627 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Because of their aesthetic appeal, ease of erection, efficient utilization of structural materials, and other notable advantages, cable-stayed bridges have found wide applications all over the world in the last few decades. Bridges of this type have recently entered a new era with main spans exceeding a value of 1000 m.Like all other bridges, cable-stayed bridges are affected by different types of loadings such as dead, live, earthquake, shrinkage, creep and temperature loadings. But, because of large dimensions and high flexibility of cable-stayed bridges, earthquake and temperature loadings would be extremely affective. But design codes such as AASHTO LRFD, EURO Code neglect the concurrency of these two types of loadings in their load combinations. This research studies the effects of concurrency of temperature and earthquake loading on cable-stayed bridges based on AASHTO LRFD Bridge Design Specifications and how this event will necessitate the use of a new load combination containing both earthquake and temperature effects. Three dimensional finite element models made by SAP2000 will be used for analysis and geometric nonlinearities containing sagging of cables and beam-column behavior of pylon and the deck are considered.The analysis is first done for a 400 m main span bridge and the results are presented. Then a parametric study is developed to investigate the effect of different parameters on this event. The following factors were considered: (1) main span length, (2) value of temperature difference, (3) deck to pylon connection, and (4) pylon shape
  9. Keywords:
  10. Thermal Load ; Cables Stayed Bridges ; Earthquake Excitation ; AASHTO T-283 Standard ; SAP 2000 Software

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