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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49144 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Kazemi, Mohammad Taghi
- Abstract:
- Steel Concentrically Braced Frames are common lateral load resisting frames. Poor design of this system can lead it to premature failure of braces. This failure may be due to non-elastic buckling of brace members or their connections. Design Codes divide Concentrically Braced frames into two groups: Ordinary Concentrically Braced Frames and Special Concentrically Braced Frames and for each, specific limitations have been determined for width to thickness ration and slenderness. Many of these limitation have been obtained on the basis of experimental tests. In this thesis steel braces behavior under cyclic loading is studied. For parametric investigation, Finite Element Method is used. Abaqus is used for modelling the braces. Results of this method Correlate well with the results of previous tests done by other researchers. The results of some samples have been used to check the onset of local buckling and fracture initiation (using Void Growth Method). The samples consisted of Circular and Square Hollow Section. The impact of various factors including width to thickness ration and slenderness on the onset of local buckling, fracture initiation and energy dissipation is studied. The results show that by increasing slenderness and decreasing width to thickness ratio, onset of local buckling and fracture initiation occur later. By increasing the slenderness, more energy dissipated in braces, but width to thickness ratio has less impact on energy dissipation
- Keywords:
- Local Buckling ; Voids Growth ; Steel Brace ; Concentrically Steel Braces ; Fracture Initiation ; Width to Thickness Ratio ; Stenderness
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