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Optimal Placement of Ribbed Bracing System (RBS) in Structures Using Genetic Algorithm

Hosseini Amirabadi, Hamed | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48767 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar; Toufigh, Vahab
  7. Abstract:
  8. Placement of control and bracing systems in a structure is one of the most important factors affecting the effectiveness of the system in reducing responses to earthquakes. In other words, a control system with a proven effectiveness in earthquake does not reduce the structure responses unless used with proper placement. The performance of Ribbed Bracing System (RBS) in enhancing seismic response of structures, especially in preventing the buckling of bracing under compression and removing residual displacements, is approved by analytical and experimental studies, but optimal placement of such systems in structures has not been studied yet. Hence, in this research the optimal placement of RBS systems is investigated. The decision variable of this problem is to choose between conventional brace or RBS, so as to minimize the damage index of the structure which is obtained from drift and acceleration of the floors. Discreteness of decision variable along with dynamic loading makes the structure response to not follow regular order. Accordingly, among different methods for optimal placement, Genetic Algorithm has been chosen. For the numerical study, two braced frames of four- and eight-story are modeled with lumped plasticity using OpenSees. The results indicate that by increasing the intensity of earthquakes, RBS reduces the damage index in structures especially when used in lower stories
  9. Keywords:
  10. Genetic Algorithm ; Buckling ; Ribbed Bracing System (RBS) ; Control System ; Optimal Placement

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