For the effective management and maintenance of a transport network it is important to identify the most at-risk bridges within the network and subsequently implement efficient retrofit solutions. The risk assessment process adopted for this purpose usually makes use of vulnerability or fragility functions that may be either simple empirical expressions or bridge-specific expressions developed from time-consuming non-linear dynamic analyses. Fragility curves defined for bridge taxonomies are less precise because fragility curves are in general site and bridge dependent. In this work the possibility of using a simplified displacement-based assessment (DBA) procedure for the identification of bridge fragility functions is explored. The simplifications to the DBA approach are made so that the inputs required for assessment are limited to bridge characteristics that can be readily identified from a rapid visual inspection of the bridge (or from drawings). Nonetheless, by incorporating a number of input parameters that can dictate the displacement capacity of a bridge, it is argued that the simplified DBA procedure can still provide a good level of accuracy, particularly compared to simplified empirical methods. In addition to this, for portfolio risk assessment, this approach can be easily applied and is more refined than the use of fragility curves defined for bridge taxonomies. This is demonstrated in the paper by comparing fragility functions obtained via various methods, for a number of RC bridge typologies commonly found in Italy.

中文翻译：

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基于位移的典型意大利RC桥梁评估

为了有效地管理和维护传输网络，重要的是确定网络中最危险的网桥，然后实施高效的改造解决方案。为此目的采用的风险评估过程通常利用脆弱性或脆弱性函数，这些函数可以是简单的经验表达式，也可以是通过耗时的非线性动态分析开发的桥梁特定表达式。为桥梁分类法定义的易碎性曲线不太精确，因为易碎性曲线通常取决于站点和桥梁。在这项工作中，探讨了使用简化的基于位移的评估（DBA）程序来识别桥梁脆性函数的可能性。简化了DBA方法，因此评估所需的输入仅限于桥梁特征，可以通过对桥梁（或图纸）进行快速目视检查来轻松识别。尽管如此，有人认为，通过合并许多可以决定桥梁位移能力的输入参数，有人认为简化的DBA程序仍然可以提供良好的准确性，特别是与简化的经验方法相比。除此之外，对于投资组合风险评估，此方法可以轻松应用，并且比为桥梁分类法定义的脆弱性曲线的使用更完善。通过比较通过各种方法获得的易碎性函数（针对意大利常见的许多RC桥梁类型），可以证明这一点。