Comparison of Different Approaches for Direct Losses Assessment Based on Performance Base Earthquake Engineering

Abstract eng:
This paper addresses the problem of estimating direct economic losses due to seismic damage in modern buildings that comply with seismic codes. The losses were estimated using analytic methods based on performance based earthquake engineering (PBEE). Two approaches are compared: (1) Repair cost estimation based on damage to the structure, and (2) Repair cost estimation based on a global damage ratio and a building replacement cost. The PBEE methodology could be applied on any type of building in seismic regions. As a case study, modern school buildings located in areas of high seismicity in Peru were analyzed. The results of the model were obtained through incremental dynamic analysis (IDA). The building’s global damage states were defined by evaluating the model’s local damage. The local damage states and intervention costs were evaluated for each type of element in the building, taking into account available resources in the area. Structural and non-structural elements of the building were taken into consideration. Finally, the expected loss function was obtained by using the theorem of the total probability. The results showed that multiplying the percentage of damage by reparation cost to obtain the expected loss can overestimate the losses for all intensities measured. Further studies on the time and costs of different repair procedures considering local workforce and available resources are recommended.

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