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Investigation of Strain Jumping and Its Effect on Evaluating Capacity of Steel Bracing Deformations

Karbalaee, Mohammad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48599 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. In this study, HSS and double angle braces subjected to cyclic loading in order to study the buckling and post buckling behavior have been investigated by Finite Element method. The results of FE analysis are fairly in good agreement with experiments. Analysis demonstrate that when local buckling occurs in middle span, subsequently, strain rises severely. Accordingly, this strain jumping causes early fracture in braces. Therefore, local buckling can be one of the primary reasons of fracture in braces. As a result, local buckling must be considered one of the primary limit state of Performance-Based design of steel braces. In addition, finding a way to predict local buckling can help us to determine brace ductility. For this purpose, we have tried to predict fracture of specimens according to their strain and stress history at plastic zone of middle span by using Cyclic-Void-Growth-Model. Comparing of analytical and experimental results show proper accurate in predicting steel braces fracture. Therefore, in this study braces with vary slenderness, width to thickness, and yield stress have been analyzed. In conclusion, brace fracture and local buckling postpone with decreases in the width-thickness ratio and yield strength or increases in the slenderness ratio
  9. Keywords:
  10. Local Buckling ; Deformation Capacity ; Strain Jump ; Steel Brace ; Finite Element Method ; Fracture Prediction

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