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Development of Fragility Curves of Confined Masonry Buildings

Ahmadi, Mohammad Hossein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45532 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:
  8. Masonry buildings are one of the most vulnerable structures against earthquakes, and therefore their seismic response should be evaluated in order to mitigate casualties in the future. Although there are numerous experimental and analytical studies on these buildings, few have aimed on Confined Masonry (CM) buildings to simulate and predict their seismic performance. To estimate damage, assess vulnerability and choose the best retrofitting method, fragility curves can be utilized as a powerful tool. In this paper, the hysteretic behavior of two typical CM walls with and without opening is calibrated in both In-plane (IP) and Out-of-Plane (OOP) loading directions making use of OPENSEES oftware. The simple single-strut (compression-only) element has been considered to represent the masonry wall. Thirty earthquake records in various soil conditions covering broad spectrum of ground motion parameters, have been used for nonlinear dynamic analysis to reduce the uncertainty.Moreover, the effect of Soil-Structure Interaction (SSI) on the damage severity of each case was evaluated. To develop fragility curves, Park-Ang damage index is utilized and the correlation of several ground motion parameters with this index is evaluated. The results show the damage probability of confined masonry walls with and without opening for various earthquakes intensities. The correlation between 24 ground motion parameters and Park-Ang damage index demonstrates that EPA (Effective Peak Acceleration) has strong correlation for masonry walls. Probable damage increases in soft soils and higher intensities. The walls with opening are more vulnerable than the walls without opening. Also the mode of failure of building is OOP failure and should be considered in obtaining the fragility curves
  9. Keywords:
  10. Fragility Curve ; Vulnerability ; Soil-Structure Interaction ; Confined Masonary Building

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