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Investigation of Local Buckling and Prediction of Fracture Onset in Hollow Section Steel Beams

Danapour, Milad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53065 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Alijani Moghaddam, Hassan
  7. Abstract:
  8. In this study, the behavior of cantilevered HSS beams under cyclic bending loading are modeled in order to study the buckling and post buckling behavior have been investigated by Finite Element method.The analytical results are fairly in good agreement with the experimental results. The analysis demonstrates that when local buckling occurs in near of connection area, subsequently, the strain grows severely that is entitled as strain rise and then, is caused fracture. As a result, local buckling limits the ability of these members to form stable plastic hinges and the behavior is highly dependent on the width-thickness (b/t) and the depth-thickness ratio (h/t).Also, the thesis has been tried to predict fracture occurrence of specimens according to their strain and stress history at plastic zone by using Cyclic-Void-Growth-Model (CVGM). For accurate comparing of analytical and experimental results in predicting of local buckling and fracture occurrence, further researches will be needed. So, fracture and local buckling of beams with decreases in the width-thickness ratio and depth-thickness will be reached at larger rotation level
  9. Keywords:
  10. Bending ; Cyclic Loading ; Finite Element Method ; Local Buckling ; Strain Jump ; Hollow Stractural Sections (HSS) ; Cyclic Void Grow Model (CVGM) ; Fracture Prediction

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