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Analytical fragility curves for reinforced concrete building using single point scaled spectrum matched ground motion analyses
Mazumder, Ram Krishna1, Saif Uddin, Muhammad2, Rajen Dey3, Ahmed, Ansary,Mehedi4.
Seismic performance is obtained for a five-storied reinforced concrete frame building
performing non-linear dynamic time history analyses. Performance of the building was obtained
as a mean of fragility function of spectral acceleration. Earthquake ground motion records are
selected from online source considering local earthquake faults scenario proposed in
Comprehensive Disaster Management Program (CDMP) and then scaled to fit with Bangladesh
National Building Code (BNBC) 1993 design response spectra. Since the structure is considered
as typical reinforced concrete ordinary moment resisting frame located in Bangladesh,
mechanical properties and other associated parameters are chosen according to Bangladeshi
perspective. Each ground motion spectrum is matched with design code spectrum at fundamental
time period of the building. Non-linear static pushover analysis is performed to determine
damage states from pushover curve. Four damage states (from slight to collapse) are defined
based on simplified assumptions. A set of dynamic time history analyses are carried out in order
to obtain probability density function of the displacement demand correspond to different level of
ground motions. Cumulative distribution of each associated damage states allows deriving
fragility curves. Finally four fragility curves are obtained for four damge grades (slight, moderate,
severe and collapse)
Affiliation:
- Chittagong University of Engineering & Technology, Bangladesh
- Chittagong University of Engineering & Technology, Bangladesh
- Chittagong University of Engineering & Technology, Bangladesh
- Chittagong University of Engineering & Technology, Bangladesh
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