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Optimization of Distribution and Stiffness of Connections in Steel Frames by Value based Seismic Design

Alimardani, Mohammad Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55498 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmail Pourestekanchi, Homayoon
  7. Abstract:
  8. Structural optimization has always been one of the concerns of engineers. Usually, engineers decide to optimize the structure with its weight. Nowadays we know that the best solution in weight optimization is not good for the structural damage and performance of the structure due to risk analysis.In this study, using the genetic algorithm to reduce construction cost, Loss and damaged cost and total cost of the structure by calculating structural damage based on FEMA-P58 guidelines according to two types of connections (rigid or hinge) and their elements (beams and columns) in two types of structures 4 and 8 story has been investigated.At each stage of increment in algorithms, first, the created populations are subjected to static and dynamic analysis. Constraint functions including element capacity, displacement, and drift are applied to the results and according to the constraint penalty, the final cost is optimized as the objective function. In this research, two objective functions are considered independently.First, Code-based design (CBD) in which only the populations are subjected to static analysis and then optimized construction cost without considering the damage cost. Second, Value-Based Design (VBD) in which populations are subjected to static analysis, nonlinear dynamic time history analysis under the endurance time records.Furthermore, the influence of the drift constraint on the structure’s optimal results from two modes of CBD and VBD has been investigated. The results include construction costs, damage costs types, types and distribution of connections in the structure, optimal sections, and the history of algorithm convergence are presented, discussed, and reviewed
  9. Keywords:
  10. Structural Optimization ; Genetic Algorithm ; Endurance Time Method ; Life Cycle Cost (LCC) ; Value Based Seismic Design ; Steel Frames ; Federal Emergency Management Agency (FEMA)P58 Code

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