What question did this study set out to answer?

The aim is to refine fragility curves for wooden buildings by identifying specific damage thresholds and ensuring accuracy in damage assessments.

February 5, 2026

Fragility Curves for Wooden Buildings Linked to Structural Strength with Focus on the Damage Onset Threshold

Key Points

The aim is to refine fragility curves for wooden buildings by identifying specific damage thresholds and ensuring accuracy in damage assessments.
Developed fragility curves using data from areas with seismic intensity of 5.5 or less.
Specified lower limits for seismic intensity related to damage onset.
Utilized regression analysis to create functions linking building strength to damage occurrence.
Established a clear damage onset threshold for wooden structures during seismic events.
Confirmed the accuracy of fragility curves by matching damage estimates to actual past earthquake impacts.

Abstract

This study improves the fragility curves for wooden buildings used in probabilistic seismic risk assessment. Specifically, we resolved two issues identified in previous studies. First, the lower limit of seismic intensity at which damage begins to occur was specified. Second, consistency was ensured between the severity of damage and the damage ratio. As a first step in improving the fragility curves, building damage data were added from areas surrounding observation sites where relatively weak ground motion with a seismic intensity of 5.5 or less was recorded. Next, damage functions showing the relationship between the building strength and seismic intensity at which damage occurs were created using regression analysis with constraints set to satisfy the above two conditions. Finally, the validity of the fragility curves was verified by comparing the damage estimates for past earthquakes with the actual damage.

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