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Quantitative Evaluation of Seismic Vulnerability of Reinforced Concrete Bridges Pier's Using the Theory of Distributed Plasticity, Plastic Hinges and C/D Methods and Compare their

Darzi, Nima | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42582 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Vafaei, Abolhassan
  7. Abstract:
  8. Performance based design was first introduced in order to evaluate seismic vulnerability of structures in retrofitting topic and was rapidly implemented in new design codes. The main cause conducting widely developing of performance based design methods, has been accurate estimation of seismic demand parameters. Since seismic structural members displacement during earthquake has a direct effect on the amount of sustained damages, displacement index has always been a key concept in performance based design. The main goal followed by this research is comparing the results obtained from the standard pushover method (with two theorems of distributed plasticity and plastic hinges) and the capacity to demand method. This comparison has been conducted through evaluated vulnerability amount of case studied bridge pier using both methods. After introducing quantitative bridge seismic vulnerability evaluation methods, a case study on Niayesh-Paknejad intersection bridge has been conducted in this research. In pushover method as a precise non-linear analysis , without implementing bilinear assumption of the base shear–displacement diagram, distributed stresses, base shear and rotation of plastic hinges parameters in a given horizontal displacement for the cap beam of bridge pier have been used to evaluate seismic vulnerability. In the second method this evaluation has been conducted through the calculated capacity to demand ratio of members. In the end, it has been shown that the pushover method evaluates vulnerability of bridge pier during a given earthquake more precisely and less conservatively. This fact will effectively help eliminating economical restrictions in implementing comprehensive retrofitting projects
  9. Keywords:
  10. Seismic Vulnerability ; Pushover Analysis ; Plastic Hinges ; Performance Levels ; Capacity to Demend Ratio ; Distributed Plasticty ; Reinforced Concrete Bridges

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