Abstract Bridges are one of the most critical but vulnerable components in a transportation network during an earthquake event. Due to structural damage, the post-earthquake safety of bridges can be reduced significantly, and in order to maintain their safety, the allowable traffic flows of bridges are often controlled or regulated. Since the post-earthquake traffic flow capacities of bridges play an integral role in assessing the flow capacity of a transportation network and subsequently evaluating the resulting disruptions to supply chain systems as well as the movement of people and vehicles, it is imperative to understand the expected post-earthquake functionalities of bridges as part of the transportation network. This paper proposes a reliability-based indicator for assessing the expected post-earthquake traffic flow capacity of a highway bridge. In this paper, the structural safety of a bridge before and after an earthquake event is expressed by its reliability index. In order to simplify the process of computing the post-earthquake reliability indices of a bridge associated with a wide range of earthquake intensities, a bridge-specific reliability-intensity surface is introduced to represent the reliability indices given a set of earthquake intensities and the associated uncertainties. Then, the post-earthquake reliability index of a bridge is linked to the resulting traffic flow capacity by adjusting the nominal values of the live load based on the post-earthquake remaining traffic flow capacity. Using the reliability-intensity surface and the relationship between reliability index and traffic flow capacity, the allowable traffic flow capacity of a bridge subjected to a given earthquake intensity is computed, and by considering a range of earthquake intensities to which a bridge is potentially exposed, the proposed indicator represents the average allowable traffic flow that can be carried by a bridge in the event of an earthquake.

中文翻译：

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基于可靠性的公路桥梁震后通行能力指标

摘要 桥梁是地震期间交通网络中最关键但最脆弱的组成部分之一。由于结构损坏，桥梁的震后安全性会显着降低，为了维护桥梁的安全，往往会控制或调节桥梁的允许交通流量。由于桥梁的震后交通流量在评估交通网络的流量能力以及随后评估由此产生的供应链系统中断以及人员和车辆的流动方面发挥着不可或缺的作用，因此必须了解预期的交通流量作为交通网络一部分的桥梁的震后功能。本文提出了一种基于可靠性的指标，用于评估公路桥梁的预期震后交通流量。本文以桥梁的可靠度指标来表示地震前后桥梁的结构安全性。为了简化与大范围地震烈度相关的桥梁震后可靠性指标的计算过程，引入了桥梁特定的可靠性-烈度面来表示给定一组地震烈度和相关联的桥梁的可靠性指标。不确定性。然后，通过根据震后剩余交通流量调整活荷载的标称值，将桥梁的震后可靠性指标与由此产生的交通流量联系起来。