This paper presents vibration-based damage detection (VBDD) for testing a steel-concrete composite bridge deck in a laboratory using both model-based and non-model-based methods. Damage that appears on a composite bridge deck may occur either in the service condition or in the loading condition. To verify the efficiency of the dynamic test methods for assessing different damage scenarios, two defect cases were designed in the service condition by removing the connection bolts along half of a steel girder and replacing the boundary conditions, while three damage cases were introduced in the loading condition by increasing the applied load. A static test and a multiple reference impact test (MRIT) were conducted in each case to obtain the corresponding deflection and modal data. For the non-model-based method, modal flexibility and modal flexibility displacement (MFD) were used to detect the location and extent of the damage. The test results showed that the appearance and location of the damage in defect cases and loading conditions can be successfully identified by the MFD values. A finite element (FE) model was rationally selected to represent the dynamic characteristics of the physical model, while four highly sensitive physical parameters were rationally selected using sensitivity analysis. The model updating technique was used to assess the condition of the whole deck in the service condition, including the boundary conditions, connectors, and slab. Using damage functions, Strand7 software was used to conduct FE analysis coupled with the MATLAB application programming interface to update multiple physical parameters. Of the three different FE models used to simulate the behavior of the composite slab, the calculated MFD of the shell-solid FE model was almost identical to the test results, indicating that the performance of the tested composite structure could be accurately predicted by this type of FE model.

中文翻译：

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基于非模型和基于模型的方法基于振动的钢-混凝土复合板损伤检测

本文介绍了基于振动的损伤检测（VBDD），用于在实验室中使用基于模型的方法和基于非模型的方法来测试钢混凝土组合桥面板。复合材料桥面甲板上出现的损坏可能会在使用状态或装载状态下发生。为了验证动态测试方法评估不同损坏情况的效率，在使用条件下设计了两种缺陷情况，方法是沿钢梁的一半卸下连接螺栓并替换边界条件，而在荷载中引入了三种损坏情况通过增加施加的负载来改善 在每种情况下均进行了静态测试和多参考冲击测试（MRIT），以获得相应的挠度和模态数据。对于非基于模型的方法，模态柔韧性和模态柔韧性位移（MFD）用于检测损伤的位置和程度。测试结果表明，可以通过MFD值成功识别出缺陷情况和载荷条件下损坏的外观和位置。合理选择了有限元（FE）模型来表示物理模型的动态特性，同时使用敏感性分析合理地选择了四个高度敏感的物理参数。使用模型更新技术来评估整个甲板在使用条件下的状况，包括边界条件，连接件和平板。利用损坏函数，Strand7软件与有限元分析一起与MATLAB应用程序编程接口结合使用，以更新多个物理参数。