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Development of a Framework for Value-based Seismic Design of Structures using Endurance Time Method

Mirfarhadi, Ali | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 54479 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmail Pourestekanchi, Homayoon
  7. Abstract:
  8. The aim of this study is to develop the value-based design approach using the endurance time method as a comprehensive and efficient framework in optimal seismic design of structures. Optimal resource allocation is an interesting and important subject in the seismic design of structures from the theoretical and practical viewpoint. Finding optimal solutions requires the use of a trial and error process that is accompanied by repetitive structural performance evaluation. The seismic design process will be efficient when it provides a comprehensive and reliable estimation of the earthquake effects and be cost-efficient in terms of computational demand. In this regard, the value-based design approach is developed as an integrated design framework that can include a comprehensive set of performance objectives and decision-making indicators such as seismic risk, resilience, sustainability, reliability, construction and maintenance considerations in the design process. Performance objectives and decision-making indicators are weighted based on their relative values, and the total value of the building is considered as the design objective. For each design alternative, decision criteria are evaluated and the building is designed in a way its total value is maximized. In the present study, the structural behavior is evaluated using the endurance time method and the seismic consequences is predicted according to the FEMA P-58 loss assessment procedure. The endurance time method is a dynamic analysis process that uses pre-designed acceleration functions as excitation input. The endurance time method can predict the structural response parameters at different levels of seismic intensity with sufficient accuracy and with significantly lower computational demand than conventional time history analyzes. In addition, the FEMA P-58 methodology has recently been developed as one of the most reliable building-specific loss assessment procedures. Implementing the endurance method and FEMA P-58 methodology within the value-based design framework leads to a comprehensive, reliable and efficient design optimization procedure. The developed methodology is used in two case studies for the optimum design of concrete and steel moment-resisting frames. Based on the result of these studies, the value-based design approach significantly increases the total value of the studied buildings and it is shown that the code-based approach leads to non-optimum designs, considering the maximum achievable value. At the end of this dissertation, an efficient procedure for predicting the record-to-record variability and a new approach to calculate the probability distribution of cumulative seismic losses using the endurance time method are developed
  9. Keywords:
  10. Value Based Seismic Design ; Performance-Based Seismic Design ; Risk Analysis ; Value Engineering ; Earthquake Engineering ; Endurance Time Method ; Life Cycle Cost (LCC)

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