Second-Generation Component and System-Level Seismic Fragility Models for Reinforced Concrete Bridges in California

California is a seismically active region that contains approximately 26,000 bridges. Historical earthquakes have caused severe damage and collapse of bridges in California, resulting in casualties, economic losses, and disruptions to transportation networks. Seismic fragility models of bridges estimate the probability of exceeding damage states at varying ground motion intensity levels. These models can be utilized for bridge vulnerability assessment, risk and resilience quantification, and to support earthquake preparedness and response planning. Recent studies have developed a new generation of seismic fragility models for bridges, demonstrating several advancements when compared with the widely used first-generation HAZUS models. These models, termed second-generation fragility functions, are derived through detailed dynamic response analyses and are differentiated at the component level, with more rational, performance-based criteria for bridge grouping and archetype sampling. This study compiles and adapts a comprehensive set of second-generation fragility models from the literature. As part of this compilation, we filtered out fragility functions with outdated capacity models and unrealistic bridge configurations, establishing uniform bridge grouping criteria, and harmonized different cross-model ground motion intensity measures and bridge component definitions. The database comprises approximately 2,300 component- and 500 system-level fragility models categorized into 26 bridge groups. It can serve as a valuable resource for researchers and practitioners conducting various related analyses to enhance the seismic resilience of bridge infrastructure in California.加利福尼亚州属于地震活跃区域，境内拥有约2.6万座桥梁。历史地震曾对该州的桥梁造成严重损毁乃至坍塌，进而引发人员伤亡、经济损失与交通网络中断。 桥梁地震易损性模型（seismic fragility models）可用于估算不同地震动强度水平下，桥梁超出特定损伤状态的概率。此类模型可应用于桥梁易损性评估、风险与韧性量化，同时可为地震防灾及应急响应规划提供支撑。 近期已有研究开发出新一代桥梁地震易损性模型，相较于当前广泛使用的第一代HAZUS模型，该类模型具备多项改进。 这类被称为第二代易损性函数的模型，通过精细化动力响应分析推导得出，且在构件层面实现差异化建模，并采用更为合理的基于性能准则开展桥梁分组与原型抽样。 本研究从已发表文献中整理并适配了一套完整的第二代易损性模型集。 在整理过程中，研究团队剔除了采用过时承载力模型与不合理桥梁构型的易损性函数，确立了统一的桥梁分组准则，并对不同模型间的地震动强度指标与桥梁构件定义进行了协调统一。 该数据集包含约2300个构件级与500个系统级地震易损性模型，共划分为26个桥梁组别。 本数据集可为致力于提升加利福尼亚州桥梁基础设施地震韧性的研究人员与工程从业者开展各类相关分析提供宝贵的参考资源。

搜集汇总

背景与挑战

背景概述

该数据集提供了加州钢筋混凝土桥梁的第二代组件和系统级地震易损性模型，包含约2,300个组件级和500个系统级模型，分为26个桥梁组。这些模型基于详细动态分析，改进了第一代HAZUS模型，适用于桥梁脆弱性评估、地震风险量化和韧性提升研究。数据集旨在支持研究人员和从业者增强加州桥梁基础设施的地震韧性。