In this work, a two-step damage identification method has been proposed for simply supported beam bridge local damage identification based on strain response reconstruction and statistical theory under moving loads. Damage could be identified without the response of healthy structure. Strain reconstruction equation was derived based on state space model. Strain responses were divided into two groups and corresponding reconstructed strain response of each group was obtained. Strain standard deviation (SSD) index was proposed based on the theory of static. The developed two-step method could be summarized as the following: first, SSD curves at damage state were employed to locate damage elements. Then, least square-based model updating method was applied to evaluate damage severity in the identified damage elements. Numerical evaluations on simply supported beams showed that the proposed method effectively identified damage elements and revealed damage severity even at noise inten...

中文翻译：

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基于应变响应重构和统计理论的梁桥损伤识别两步法

在这项工作中，提出了一种基于应变响应重构和统计理论在移动载荷作用下的简支梁桥局部损伤识别的两步损伤识别方法。没有健康结构的响应就可以识别出损害。基于状态空间模型推导了应变重建方程。将应变响应分为两组，并获得每组相应的重构应变响应。基于静态理论提出了应变标准偏差（SSD）指标。所开发的两步法可以概括如下：首先，采用损伤状态下的SSD曲线来定位损伤元素。然后，应用基于最小二乘的模型更新方法来评估所识别出的损坏要素中的损坏严重程度。