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On the Characteristics and Performance of RCFrames with Y-Bracing Systems

Atri, Saman | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 40605 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. Steel bracing systems can be used effectively for seismic retrofitting of existing RC buildings as well as for seismic design of new building. Steel bracing system has been used to increase the lateral load resistance of steel structures. In recent years the concept of steel bracing has also been applied to the retrofitting of reinforced concrete frames, especially to improve seismic performance of non-ductile reinforced concrete buildings. The use of steel bracing systems for seismic rehabilitation of RC frames offers some advantages such as (a) minimal added weight to the structure; (b) ease and speed of construction;(c) increased architectural flexibility; in comparison with RC shear walls. Due to shortcoming of sufficient research about the geometrical characteristics of eccentric steel brace, more specifically, the geometrical characteristics of the Y-bracing systems. In this study two frames with (B/H) <1 and (B/H)>1 will be considered to find the best shape of the model with Y-bracing systems. The link part is a fuse-like component that dissipates energy by the formation of plastic flexural and/or shear hinges at its ends, when the building is subjected to severe lateral loads. In this investigation, first, by studying of the system in the elastic region for each condition the maximum elastic stiffness of the frame for different location of link, is calculated. Then, the best fitting optimal shape of the link and brace elements are projected, analytically. In the next step, the actual behavior of this new Y-bracing system is experienced in the nonlinear analysis. Using the results on nonlinear analysis, the main properties of the Y-bracing, such as the energy dissipation characteristics of the systems, are properly inspected.

  9. Keywords:
  10. Reinforced Concrete Frame ; Upgrading ; Nonlinear Analysis ; Energy Dissipation ; Y-Bracing

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