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Value Based Seismic Design of Urban Concrete Pier Bridges by Endurance Time Method

Filizadeh, Reza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49053 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. Bridge is one of the most important structure that are used in urban transportation system. In recent decade, international standards and codes have introduced “Performance Based Design” for structure design criteria. Large and complex dynamic and time history analyzes are obstacles against this method; especially in finding optimum design that requires repeated analyzes. In this research, application of Endurance Time (ET) method in seismic design of urban concrete bridges has been evaluated and value based design of them has been presented. In ET method, seismic performance of structures under artificial intensifying accelerograms is investigated. Performance of structure in performance levels has been examined by bridge piers drift. Life cycle cost is an effective factor on structure design. The structure must have the best performance with the least life cycle cost. In the beginning, seismic design of bridges has been done based on codes and only resistance criteria; then possibility of reaching to optimum economical design due to considering life cycle cost has been examined. Life cycle cost is sum of the initial cost, maintenance cost during the life of structure and the costs due to bridge damage. Secondary and indirect costs including social costs and downtime costs had the most effect in the life cycle cost of bridges. The initial cost that is the optimization criteria for most existing structures did not have much effect on results. The performance of Structure has been determined by ET method as a new method based on time history with minimum number of analyzes. Genetic Algorithm has been used to find optimum design
  9. Keywords:
  10. Genetic Algorithm ; Endurance Time Method ; Life Cycle Cost (LCC) ; Seismic Design ; Value Based Seismic Design ; Concrete Bridge ; Urban Concrete Pier Bridges

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