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On the Characteristic and Behavior of Concrete Structure with Steel Knee Hat Brace

Ziyadidegan, Saeideh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 43237 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Mofid, Massoud
  7. Abstract:
  8. Nowadays, the knee bracing system (KBF) takes civil engineer’s attention because of its benefits and properties. This new form of framing is constructed through the knee and the diagonal brace elements. The knee part is a fuse-like component that dissipates energy by the formation of plastic flexural and/or shear hinge, when the building is subjected to severe lateral loads. In this system, the diagonal brace provides most of the lateral stiffness. Also the flexural or shear yielding of the knee element provides the ductility under a severe earthquake. In this way, the damage is concentrated in a secondary member, which can be easily repaired at minimum cost. Floor distortions are reduced compared to the EBF, to a level similar to that of the conventional moment resisting and concentrically braced frames. In this study, first a one-story concrete frame with different shapes, (span/height)<1 and (span/height)>1, and steel Knee Hat Brace (KHB) is considered. Then, the system is modeled by SAP2000 and F.E software. Also a parametric study is applied on KHB to obtain the best positioning of this system by modeling 36 different lengths and angles for each tall and wide frame. A pushover analysis is done on frames, and the positions of plastic hinges and the behavior of the system during failure is obtained. Also the seismic behavior factors of structures are achieved for both two types of KBF system
  9. Keywords:
  10. Plastic Hinges ; Pushover Analysis ; Strength Reduction Factor ; Knee Brace ; Optimal Shape ; Moment Yielding

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