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Investigation of Progressive Collapse Resistance of RC Structures Retrofitted at Joints by FRP Sheets

Khazaee, amin | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43579 (09)
  4. University: Sharif University Of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Progressive collapse in the structures can be happened as a result of many events such as terrorist attack, planes or vehicle collision to the structures and etc. Researchers’ attention to this phenomenon after occurring progressive collapse in Ronan Point building attracted and by happening terroristic attacks in Alfred P. Murrah and WTC buildings, studies in this field has developed extensively, meanwhile some of the codes, including UFC 4-023-03 or GSA, have proposed general instructions and analytical methods for increasing the strength of the structure against progressive collapse. If the structure in this analysis, does not meet the acceptance criteria of the code, the structure must be re-designed or be retrofitted. In this study we have focused our attention in strengthening reinforced concrete joints with CFRP sheets in structures that can’t meet the acceptance criteria of UFC. After the column removal in some floors, the hinge rotation in the primary structure has exceeded acceptance limits. In order to retain the plastic hinge rotations in the acceptance range, structural joints have to be strengthened with CFRP sheets. We have modeled these joints in ANSYS software. During the nonlinear static loading, we obtain bending stiffness of retrofitted and plain joints and implement the additional stiffness in the primary structure in SAP. The results of progressive collapse analysis on the retrofitted structure, show that the applied method has the ability to decrease the plastic hinge rotation in order to satisfy the acceptance criteria
  9. Keywords:
  10. Nonlinear Analysis ; Progressive Collapse Analysis ; Carbon Fiber Reinforced Polymer (CFRP) ; Fiber Reinforced Polymer (FRP) ; Joints Retrofitting

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