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Incorporation of collapse safety margin into direct earthquake loss estimate
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  • Journal title : Earthquakes and Structures
  • Volume 10, Issue 2,  2016, pp.429-450
  • Publisher : Techno-Press
  • DOI : 10.12989/eas.2016.10.2.429
 Title & Authors
Incorporation of collapse safety margin into direct earthquake loss estimate
Xian, Lina; He, Zheng; Ou, Xiaoying;
 Abstract
An attempt has been made to incorporate the concept of collapse safety margin into the procedures proposed in the performance-based earthquake engineering (PBEE) framework for direct earthquake loss estimation, in which the collapse probability curve obtained from incremental dynamic analysis (IDA) is mathematically characterized with the S-type fitting model. The regressive collapse probability curve is then used to identify non-collapse cases and collapse cases. With the assumed lognormal probability distribution for non-collapse damage indexes, the expected direct earthquake loss ratio is calculated from the weighted average over several damage states for non-collapse cases. Collapse safety margin is shown to be strongly related with sustained damage endurance of structures. Such endurance exhibits a strong link with expected direct earthquake loss. The results from the case study on three concrete frames indicate that increase in cross section cannot always achieve a more desirable output of collapse safety margin and less direct earthquake loss. It is a more effective way to acquire wider collapse safety margin and less direct earthquake loss through proper enhancement of reinforcement in structural components. Interestingly, total expected direct earthquake loss ratio seems to be insensitive a change in cross section. It has demonstrated a consistent correlation with collapse safety margin. The results also indicates that, if direct economic loss is seriously concerned, it is of much significance to reduce the probability of occurrence of moderate and even severe damage, as well as the probability of structural collapse.
 Keywords
collapse margin ratio;earthquake;damage model;loss ratio;OpenSEES;collapse probability;
 Language
English
 Cited by
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