Quasi-periodic structures, as found in multi-span bridges, multi-bay and multi-storey buildings, are often characterized by a high modal density, even at low frequencies. This clustering of modes poses challenges in operational modal analysis, as well as in finite element model updating, where a pairing of experimental and numerically predicted modes is required. To overcome these difficulties, an alternative method for model updating based on the so-called free wave characteristics has recently been proposed. In this work, this method is applied to calibrate a finite element model of the K032 viaduct of the A11 highway in Bruges, Belgium. Vibration measurements are conducted to experimentally determine the free wave characteristics of the viaduct. In the model updating, the discrepancy between the calculated and identified free wave characteristics is minimized. The results are validated by comparing measured frequency response functions with those obtained from the updated finite element model.

在多跨桥，多棚和多层建筑中发现的准周期结构通常具有很高的模态密度，即使在低频也是如此。模式的这种聚类在操作模式分析以及有限元模型更新中提出了挑战，其中需要一对实验模式和数值预测模式。为了克服这些困难，近来提出了一种基于所谓的自由波特性的用于模型更新的替代方法。在这项工作中，该方法用于校准比利时布鲁日A11高速公路K032高架桥的有限元模型。进行振动测量以实验确定高架桥的自由波特性。在模型更新中，计算出的和识别出的自由波特性之间的差异被最小化。通过将测得的频率响应函数与从更新的有限元模型获得的频率响应函数进行比较，可以验证结果。