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Seismic Behavior of Reinforced Concrete Frames Retrofitted by Pre-Stressed Steel Strips

Taghizadeh, Reza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45574 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. With occurring severe earthquakes, damages of columns in RC buildings can lead to overall failure and collapse. So retrofitting of such columns that do not comply with the design requirements is necessary to prevent such phenomena. A variety of methods has been introduced so far for retrofitting. The key factors in determining the retrofitting methods are being economic and easily implemented in the design. Confining concrete columns with pre-stressed steel strips is a new technique that is simple and economic. Previous experimental experiments have shown that this method can enhance ductility and overall seismic behavior of such columns.
    In the present study three and six story frames are considered and their first story columns actively confided with still strips. Nonlinear pushover and time history analysis are used to study the seismic behavior of un-retrofitted and retrofitted frames. Nonlinear analysis results, indicate an increase in ductility of retrofitted frames in comparison with un-retrofitted ones. With using of this retrofitting capacity ratios of plastic hinges in first story columns at performance point have been reduced and this result indicates the reducing amount of damages. By defining the lateral failure of first member as an ultimate point, this retrofitting technique replaced the undesirable failure of the columns by the rather more desirable failure of beams. Another results, shows a fairly good agreement in target displacements derived by pushover and time history analysis in three story frame and in first floors of six story frame, but in higher floors of six story frame results were different and it was worse with becoming more severe of applied earthquake.
  9. Keywords:
  10. Rehabilitation ; Reinforced Concrete Frame ; Seismic Behavior ; Time History Analysis ; Nonlinear Analysis ; Pushover Analysis ; Prestressed Steel Strips

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