Considering Cumulative Damage in URM Buildings for Clustered Seismicity Risk Assessment

脆弱性 无筋砌体房屋 诱发地震 砖石建筑 地震风险 结构工程 环境科学 地质学 法律工程学 地震学 工程类 化学 物理化学
作者
Pablo García de Quevedo Iñárritu,Mohsen Kohrangi,Serena Cattari,Sergio Lagomarsino,Paolo Bazzurro
出处
期刊:Earthquake Engineering & Structural Dynamics [Wiley]
标识
DOI:10.1002/eqe.4304
摘要

ABSTRACT Unreinforced masonry (URM) buildings are highly susceptible to cumulative damage, as demonstrated by the damage observations collected during and after numerous earthquake sequences. However, most previous numerical studies assessing cumulative damage in URM buildings have failed to fully capture the extent of the phenomenon observed in real events. This article aims to address this gap by applying a newly developed methodology for modeling the accumulation of damage in URM buildings in risk assessment case studies. This methodology quantifies the cumulative damage using an energy‐ and displacement‐based damage index (DI) within a component‐based framework. The methodology is validated using data from the URM school building in Visso that sustained severe, progressive damage during the 2016 Central Italy earthquake sequence. Additionally, this DI is employed to develop hazard‐consistent, damage‐state‐dependent fragility curves for five case‐study URM buildings through consecutive nonlinear dynamic analyses. The fragility analysis results align with real‐world observations, indicating a significant reduction in structural capacity due to cumulative damage. These set of fragility curves are then utilized in a risk assessment exercise. The last part of this study compares the impact on risk estimates when incorporating damage accumulation and earthquake sequences using the proposed methodology versus the conventional approach, which assumes only independent mainshocks affecting buildings in their intact state. The results reveal that the conventional approach underestimates the average annual losses for these five URM buildings in Central Italy by 45%–85%. Although the level of underestimation may vary for other URM buildings in other regions, it is undeniable that the conventional approach consistently underestimates the risk for URM structures by a significant margin.

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