Traditional damage identification (DI) approaches are based on the structural modal information, which is unstable and affected by the environment. This study proposes a novel bridge DI algorithm for the elastically supported beams with a constant cross‐section. The expression of the equivalent damage load (EDL) is deduced from the force–displacement relationship. The EDL only exists in the damaged areas, and it is a good damage indicator. Then, a principal component analysis‐based load estimation method is adopted to estimate the external nodal force and the EDL. To reduce the influence of the measurement noise and errors, this study furtherly proposes a robust EDL‐based damage indicator, which is calculated from multitype data. The numerical simulations and in‐field experiments have discussed the influence of several factors, including damage scenarios and loading conditions, on the proposed damage indicator. All results have shown that the proposed damage indicator is applicable and useful. The proposed approach can detect the damage in a real‐time manner with high computational efficiency, and it is useful for the in‐operation bridges.

中文翻译：

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通过多种类型的测量从等效损伤载荷中检测桥梁损伤

传统的损伤识别（DI）方法基于结构模态信息，该信息不稳定且受环境影响。这项研究为具有恒定横截面的弹性支撑梁提出了一种新颖的桥梁DI算法。等效损伤载荷（EDL）的表达式是从力-位移关系推导出来的。EDL仅存在于受损区域，它是一个良好的损坏指标。然后，采用基于主成分分析的载荷估算方法估算外部节点力和EDL。为了减少测量噪声和误差的影响，本研究进一步提出了一种基于EDL的稳健损坏指标，该指标是根据多种类型的数据计算得出的。数值模拟和现场实验讨论了几个因素的影响，包括拟议的损坏指标上的损坏情况和装载条件。所有结果表明，提出的损坏指标是适用和有用的。所提出的方法可以实时地以高计算效率检测损坏，对于运行中的桥梁很有用。