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On Quantification of Seismic Performance Factors for Integral Abutment Bridges

Haghighi, Farzad Reza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49078 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Integral abutment bridges (IABs) are bridges in which the deck is cast monolithically with abutment backwalls. These bridges are also jointless through deck length, due to which they act as a frame in their longitudinal direction. These differences with common seat-type bridge construction, have made IABs more economical to build and maintain and superior in seismic performance. As such, in various countries, this method of construction have been prescribed whenever possible. As an instance, integral construction is mandatory for bridges up to 60 meters in total length in England. IABs have become more of a geotechnical problem rather than simple structural problem of conventional bridges in confronting seismic excitation and thermal loading as a result of their frame action behavior. The earthquake resisting system (ERS) of IABs is contributed by structural and soil-abutment and pile interactions. As of now, there is little to no information regarding this type of construction for seismic means in national standards and specifications worldwide, despite their known superior seismic performance. Thus, gaining knowledge towards integral ERS and assessment of its behavior in case of strong ground motions seems necessary. ERS are usually best defined through seismic performance factors (SPFs). There have been various established methodologies of defining these factors in recent decades. Fema-P695 which was originaly founded on ATC-63 project, has first developed a probabilistic methodology based on performance goals of structures facing seismic activities.In this research, IABs’ earthquake resisting system have been quantified utilizing Fema’s methodology through development of SPFs. Due to importance of Soil-Structure Interaction, bridge archetypes have been modelled in continuum space using nonlinear soil constitutive material. Per Fema’s methodology, diverse but limited number of archetypes have been designed using trial SPFs, which then have been gone through numerous nonlinear static and dynamic finite element analyses. Validation process of trial SPFs consists of repetitive cycles of defining collapse margin ratios (CMR) for each archetype and their comparison to acceptable code-approved CMRs. Trial SPFs which will pass the acceptance criteria will ultimately be presented as prescribed SPFs for the corresponding ERS
  9. Keywords:
  10. Integral Abutment Bridges ; Nonlinear Dynamic Analysis ; Seismic Performance Factors ; Seismic Behavior ; Seismic Performance ; Federal Emergency Management Agency (FEMA)P695 Code ; Response Modification Factor (R) ; Nonlinear Soil Constitutive Material ; Soil Continum Modeling

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