Bridges are critical for the mobility of our society and its economic growth. Available funds for bridge repair, maintenance, and rehabilitation are limited. The Moving Ahead for Progress in the 21st Century Act (MAP-21) introduced several new parameters for improving the management of bridge assets, such as bridge element evaluation, life-cycle analysis, and risk-based performance indicators. Risk-based methods account for the uncertainties embedded into engineering variables and long-term evaluations. The objective of this paper is to identify, assess, and quantify structural risk components to bridges using probabilistic risk methodologies and data from the National Bridge Inventory database. The aim is to simplify the implementation of risk-based ranking procedures into bridge management system packages according to the MAP-21 vision. Therefore, machine learning techniques are employed to facilitate the introduction of probabilistic risk methods into bridge management systems. The procedure is described for seven hazards that are pertinent to bridges in New Jersey: overloading, fatigue, seismic, flooding, scour, vehicle and vessel collision. Risk values are computed in monetary terms to homogenize the comparison among bridges for different hazards. The analysis is performed on 5,534 bridges, showing that seismic events and fatigue resulting from truck overloading are the most dominant hazards in New Jersey, for which about 97.0% and 29.0% of bridges show some level of risk. The main limitation of the proposed framework is the lack of accurate data from bridge inventories necessary to thoroughly perform a fully structural probabilistic analysis of bridges and to minimize engineering judgment.

桥梁对于我们社会的流动性及其经济增长至关重要。桥梁维修，保养和修复的可用资金有限。《迈向21世纪的进步法案》（MAP-21）引入了一些用于改善桥梁资产管理的新参数，例如桥梁元素评估，生命周期分析和基于风险的绩效指标。基于风险的方法解决了嵌入工程变量和长期评估中的不确定性。本文的目的是使用概率风险方法论和国家桥梁清单数据库中的数据来识别，评估和量化桥梁结构风险成分。目的是根据MAP-21的愿景，将基于风险的排名程序简化为桥梁管理系统软件包。因此，采用机器学习技术来促进将概率风险方法引入网桥管理系统。描述了与新泽西州桥梁有关的七种危险的程序：超载，疲劳，地震，洪水，冲刷，车辆和船只碰撞。风险值以货币形式计算，以使不同危害桥梁之间的比较均匀。在5,534座桥梁上进行了分析，结果表明，卡车超载导致的地震事件和疲劳是新泽西州最主要的危险，约97.0％和29.0％的桥梁显示一定程度的风险。