Seismic Vulnerability Assessment of RC Frame Building using Direct Displacement-based Approach

To overcome the limitations of the force-based seismic design approach for addressing inelastic behaviour in structures, a direct displacement-based seismic design was developed. In the present study, Seismic design issues are investigated by carrying out a seismic performance assessment of 4-story RC frames with a different design approach, i.e., forcedbased and direct displacement-based, followed by fragility analyses. Non-linear static pushover analysis is applied to observe the response of the configured RC frames. Using the capacityspectrum method, the probability of damage states was determined by converting the pushover curve into the capacity spectra (ATC-40) and obtaining the performance-point values of spectral acceleration (Sa) and spectral displacement (Sd) for seismic demand zone-V. Fragility curves and a mean damage matrix were created to compare the performance of FBD and DDBD design approaches. It is observed from vulnerability analyses that there is a practically decreased 20 percent probability of complete damage by adopting the DDBD approach.