Damage Index for Performance Evaluation of Functional Maintenance After Earthquakes

Abstract eng:
In particular, when designing a high-rise building, it is recommended that the entire collapse mechanism (i.e. strong column-weak beam mechanism) be planned and sufficient safety of the building be ensured by allowing earthquake damage to spread throughout the building and by ensuring that the energy generated by the earthquake is absorbed evenly by the entire building. However, it is a matter of serious concern that the damage on every floor causes extensive spreading of the area to be restored, greatly increases the repair cost, and lengthens the restoration period, making functional recovery difficult. Developing design methods that consider the safety and post-seismic functional maintenance of buildings is required to reduce damage to buildings and minimize damage to society from major earthquakes. The authors in this study define the severity of the damage as that which repair time is becoming relatively large. An “ideal repair time (IRT)”, which is an index used to relatively evaluate the severity of the damage, is proposed from the viewpoint of functional maintenance necessary for such design. Many factors influence the repair time other than the damage state. These factors include the social and surrounding environments, number of engaged workers, work proficiency and so on. The repair time would still vary when these factors are different even if the damage state is the same. The IRT is a damage evaluation index that targets only the damage state (i.e., amount, extent, and concentration of the damage) by eliminating influences of factors other than the damage state. The IRT has the following features:

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