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Development of Fragility Curves for Short and Mid-Rise RC Buildings Retrofitted with Steel Knee Braces Based on Incremental Dynamic Analysis

Keipour, Nicka | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43129 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. All buildings should be designed to bear both gravity loads and lateral loads such as earthquake. Resisting system for earthquake can be moment resisting frame, shear wall, brace or combination of them. Normally for strengthening of reinforce concrete buildings, shear wall should be added, but in some cases after constructing RC buildings, engineers find out that building does not have enough strength against seismic loads. In this case, adding shear wall is difficult because of architectural restrictions and assembling braces on the original frame is easier.
    Structural engineers always looking to find a structural element to absorb earthquake energy to prevent potential damages of other elements. In this thesis, special kind of brace called knee brace was used. This kind of brace has two fundamental parts: diagonal member which is sufficiently strong despite buckling which provides lateral stiffness and knee member usually are chosen box section to absorb energy by plastic hinge deformation; thus this kind of braces has appropriate stiffness under lateral loads and further has high energy absorption features.
    In this thesis, knee braces have been used to retrofit 1, 3, 5, 7 story RC buildings. Four different distributions of braces over the height of buildings were used to determine the best arrangement of braces. Also, height effect of buildings on the efficiency of this retrofitting type was assessed. For this purpose, incremental dynamic analysis (IDA) were used to analyse responses of frames and according to the results of IDA, fragility curves were drawn to compare the performance of buildings before and after retrofit
  9. Keywords:
  10. Concrete Building ; Fragility Curve ; Incremental Dynamic Analysis ; Knee Brace

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