Document Type

Conference Proceeding

Publication Date



The probability that a building is sanctioned to demolition following an earthquake depends on several geotechnical, structural, strategic and financial decision variables. This paper explores the literature on post-earthquake reparability assessment of buildings focusing on structural characteristics and evaluates their approaches for four midrise code-compliant structural systems, namely, steel moment frame, reinforced concrete moment frame, light frame wood, and steel braced frame. The structural responses are estimated using incremental dynamics analysis (IDA) in accordance with FEMA P-695 provisions and the IDA results are relayed to a building-specific loss assessment framework to estimate their seismic vulnerability in terms of monetary losses. To estimate the impact of irreparability fragility, the loss assessment framework evaluates the vulnerability for each reference model at four levels of irreparability thresholds as well as for a case which excludes irreparability. The results show that the projected losses for these reference models are very sensitive to the assumptions for irreparability fragility. The impact of irreparability fragility on the final loss estimates, while varying by reference model, is relatively limited at lower levels of shaking intensity and tends to grow when incrementing toward higher levels of shaking. The paper also discusses a potential numerical issue with the framework to include irreparability in loss estimation, called ‘irreparability anomaly’, which arises from merely linking irreparability to peak residual drift. The observations emphasize the significance of the underlying assumptions for irreparability fragility in seismic vulnerability and loss assessment of building and call for further studies to establish more robust procedures.


Eleventh U.S. National Conference on Earthquake Engineering

Integrating Science, Engineering & Policy

June 25-29, 2018

Los Angeles, California