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Rapid Bridge Assessment Method for Highway Bridges

机译：高速公路桥梁快速桥梁评估方法

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There are an increasing number of highway bridges in our nation which fail to pass current simplified load rating analyses. According to the National Bridge Inventory, there are approximately 65,000 bridges posted with an additional 12,000 either recommended for posting, temporarily supported or closed altogether, though the number is likely larger. Quantitative structural assessment through the use of controlled load tests (either diagnostic or proof level) has proven effective to provide refined load rating factors, but is hampered by cost limitations, time constraints and access restrictions. As an alternative, a rapid bridge assessment method (RBAM) leveraging strains and displacements caused by operational demands has been developed in order to aid in assessing the structural integrity of bridges which fail to pass the conventional load rating analyses. The RBAM focuses on obtaining key response metrics, such as distribution and impact factors, by making use of reusable sensors where possible, quick sensor installation methods, and typical daily truck traffic. An on-site data visualization program to ensure data quality and an automated post-processing program to process large data sets and quickly extract response metrics have been developed and integrated into this method. Together these features allow for full testing and data interpretation of a bridge, within a day, without the need of excessive loads or bridge closures. This paper presents a case study demonstrating the RBAM and its validation through a traditional truck load test and finite element (FE) model analysis. It will also be shown that the RBAM is a cost- and time-effective alternative to the rather expensive and time-consuming current quantitative assessment approaches to provide refined load ratings. Last, improvements and further development to this method are briefly discussed.
机译：我们国家中有越来越多的公路桥梁，无法通过当前简化的负载评级分析。根据国家桥梁库存，大约有65,000座桥梁发布，额外的12,000次推荐用于发布，暂时支持或完全关闭，但数字可能更大。通过使用受控负载测试（诊断或证明水平）的定量结构评估已经证明有效提供精制的负载额定因子，但受到成本限制，时间约束和访问限制的阻碍。作为替代方案，已经开发出一种快速桥接评估方法（RBAM）利用由操作需求引起的菌株和位移，以帮助评估未能通过传统的负载评级分析的桥梁的结构完整性。 RBAM通过利用可重复使用的传感器可以使用可重复使用的传感器，以及典型的每日卡车交通来获取关键响应度量，例如分配和影响因素。在现场数据可视化程序，以确保数据质量和自动化后处理程序来处理大数据集并快速提取响应度量，并集成到此方法中。这些特征在一起允许在一天内完全测试和数据解释，而无需过度负载或桥接闭合。本文通过传统的卡车负荷测试和有限元（FE）模型分析，提出了一个案例研究，证明了RBAM及其验证。还还将显示RBAM是一种成本和时间有效的替代替代，用于提供精制载荷额定值的相当昂贵且耗时耗时的电流定量评估方法。简要讨论了对这种方法的改进和进一步发展。

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