Uncertainty Assessment in the Seismic Performance Evaluation of Reinforced Concrete Wall‐Frame Buildings

ABSTRACT Lack of proper consensus on appropriate consideration of aleatory as well as epistemic uncertainties into the seismic fragility estimates is often the stumbling block for reliable and coherent risk assessment procedures. Furthermore, the dispersion measure values specified in seismic design reference documents lack categorization for different building archetypes or intermediate structural performance levels. The present study integrates randomness in structural capacity and record‐to‐record variability into seismic response analysis by employing augmented incremental dynamic analysis for a reinforced concrete structural wall‐frame building. Dispersion measures for various considered uncertainties are established through statistical analyses of the summarized IDA curves. The established dispersion measure values help in comprehending the influence of uncertainty in structural capacity parameters and ground motion randomness on the response variability across different levels of seismic intensities. It is also shown that these dispersion values can be further employed for reliable probabilistic seismic fragility assessment of a structural system, in lieu of assuming certain default parametric values recommended in previous literature.