Seismic Financial Loss Estimation of Steel Moment Frame Buildings


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Abstract


A probabilistic seismic loss assessment methodology is applied to quantify earthquake risk in terms of expected annual loss (EAL). Incremental dynamic analysis (IDA) is adopted to probabilistically assess the variability of seismic demand. A computational distribution free approach is then used to rescale the sorted IDA output data to account for other sources of randomness and uncertainty that are not accounted for in the IDA analyses. The EAL of a structure due to seismic hazards is accumulated from losses contributed by all states of structural and non-structural damage. A case study of the nine-story SAC steel moment frame building constructed to pre-Northridge (inferior, brittle) and post-Northridge (superior, ductile) standards of welding connections is presented to demonstrate the implementation of the loss estimation methodology. Results show that the total losses including the contributions of structural and non-structural components are some $15,000 and $8,000 per million dollar of asset value for pre-Northridge and post-Northridge welding details, respectively, thereby indicating that a better detailing will result in significant saving in a structure’s maintenance cost. In these, structural damage contributes about $5,000 and $2,000 per million dollar of building value for pre-Northridge and post-Northridge welding details, respectively. This indicates that the non-structural damage is a major contributor to the total loss and should not be overlooked in seismic loss estimation
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Keywords


Performance Based Earthquake Engineering (PBEE); Expected Annual Loss (EAL); Incremental Dynamic Analysis (IDA); SAC Nine-Story Steel Frame Building; Distribution Free Approach; Structural Damage; Non-Structural Damage

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