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Simplified Modeling of Integral Abutment Bridges for Seismic Analysis and Prediction of Target Displacement Using Displacement Coefficient Method

Abbasi, Diako | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54118 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Performance-based design (PBD) has been accepted as one of the most reliable design methods in the past few decades. PBD can overcome inherent deficiencies associated with force-based design (FBD) and has advantages over this traditional method. Various PBD methods have been developed, which Displacement-based design (DBD) has been considered as one of the effective design approaches of the PBD method. In this study, the Displacement coefficient method (DCM) is developed for stub-type integral abutment bridges (IABs). For this purpose, two coefficients are proposed to determine the target displacement of these types of bridges. Validation of this method by nonlinear time-history analysis implies that the proposed coefficients result in a reasonable accuracy. In addition, a two-dimensional nonlinear finite element model is proposed for seismic analysis of IABs. The model captures the soil-pile-structure interaction and includes far-field soil inertia effects and piles nonlinear behavior. The compression-only (gap) elements behind abutments were used to detect possible soil wall separation phases during earthquakes. The gap stiffness parameter was studied, and a recommendation is given for its value. To validate the proposed model, several ground motion time histories were applied to pile supported single cantilever walls with free-field soil and gap elements. The active/passive seismic earth pressures exerted on the wall were compared with the conventional Mononobe-Okabe method. The results indicate that the proposed FE model is appropriate for seismic analysis of IABs and captures the soil-pile-structure interaction effects with acceptable accuracy in all phases of ground motions
  9. Keywords:
  10. Performance Based Design ; Integral Abutment Bridges ; Target Displacement ; Displacement Based Design ; Convection Coefficient ; Soil-Abutment Interaction

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