This paper presents a probabilistic framework for life-cycle seismic resilience assessment of aging bridges and transportation road networks subjected to infrastructure upgrade. The proposed framework accounts for the uncertainties in damage occurrence of vulnerable deteriorating bridges and restoration rapidity of the overall system functionality. The time-variant bridge fragilities and the damage combinations probability are evaluated considering different earthquake magnitudes and epicenter locations that define the seismic scenario. Traffic analyses are carried out to assess in probabilistic terms the network functionality profiles, the corresponding resilience levels, and a damage-based measure of life-cycle resilience. The effects of structural deterioration, seismic damage, and post-event repair actions under uncertainty are related to traffic restrictions applied over the network. The framework is applied to reinforced concrete bridges exposed to chloride-induced corrosion and simple road networks with a single bridge or two bridges in series under different earthquake scenarios. The effect of network upgrading is also investigated by adding road segments with a vulnerable bridge to strengthen the network connectivity and improve the lifetime system resilience. The results show the capability of the proposed resilience framework in quantifying the detrimental effects of structural deterioration at the network scale and the beneficial consequences of infrastructure investments, such as enhancing the network redundancy with the construction of an additional highway branch.

本文提出了一个基础设施升级后的老化桥梁和交通路网生命周期抗震能力评估的概率框架。拟议的框架解决了易损的劣化桥梁损坏的发生以及整个系统功能恢复迅速的不确定性。考虑到不同的地震震级和震中位置，这些时变的桥梁脆弱性和破坏组合的可能性被评估。进行流量分析以概率方式评估网络功能配置文件，相应的弹性级别以及基于损坏的生命周期弹性指标。结构恶化，地震破坏，不确定情况下的事件后修复操作与通过网络应用的流量限制有关。该框架适用于暴露于氯化物腐蚀下的钢筋混凝土桥梁，以及在不同地震情况下具有一个或两个串联桥梁的简单路网。还通过添加带有易受攻击的桥梁的路段来增强网络连接性并提高生命周期系统的弹性，从而研究了网络升级的效果。结果表明，所提出的弹性框架能够量化网络规模上的结构恶化的不利影响以及基础设施投资的有益结果，例如通过增加公路分支来增强网络冗余。该框架适用于暴露于氯化物腐蚀下的钢筋混凝土桥梁，以及在不同地震情况下具有一个或两个串联桥梁的简单路网。还通过添加带有易受攻击的桥梁的路段来增强网络连接性并提高生命周期系统的弹性，从而研究了网络升级的效果。结果表明，所提出的弹性框架能够量化网络规模上的结构恶化的不利影响以及基础设施投资的有益结果，例如通过增加公路分支来增强网络冗余。该框架适用于暴露于氯化物腐蚀下的钢筋混凝土桥梁，以及在不同地震情况下具有一个或两个串联桥梁的简单路网。还通过添加带有易受攻击的桥梁的路段来增强网络连接性并提高生命周期系统的弹性，从而研究了网络升级的效果。结果表明，所提出的弹性框架能够量化网络规模上的结构恶化的不利影响以及基础设施投资的有益结果，例如通过增加公路分支来增强网络冗余。