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System Identification and Displacement Profiles of Multi-Span Skewed Bridges with Seat Type Abutments

机译：用座椅型基台多跨偏斜桥的系统识别和位移轮廓

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Skewed bridges are classified as irregular structures due to the geometry of the deck and bents. The evaluation of their dynamic response is challenging as it requires a combination of several modes of vibration. In this study, the results of ambient vibration tests performed on four bridges in British Columbia, Canada are used to identify the dynamic properties and the displacement profiles of multi-span skewed bridges with seat type abutments. The frequencies of vibration, the modes of vibrations and the modal dampings are identified using frequency and time domain techniques. In addition, the directionality in the transverse and longitudinal response for skewed bridges with different levels of lateral restraint and deck flexibility is discussed. This paper improves the understanding of the dynamic response of skewed bridges, in particular their lateral response to seismic loads. This understanding contributes to having a better assessment of the seismic demands that skewed structures will undergo and to the development of displacement based design methods for these structures.
机译：由于甲板和距离的几何形状，偏斜桥被归类为不规则结构。它们的动态响应的评估是具有挑战性的，因为它需要几种振动模式的组合。在这项研究中，加拿大在不列颠哥伦比亚省的四个桥梁上进行了环境振动试验的结果，用于识别具有座椅型基台的多跨度偏斜桥的动态特性和位移轮廓。使用频率和时域技术识别振动的频率，振动模式和模态阻尼。另外，讨论了具有不同水平的横向约束和甲板柔性的横向桥梁横向和纵向响应的方向性。本文提高了对偏斜桥的动态响应的理解，特别是它们对地震载荷的横向反应。这种理解有助于更好地评估偏见要求，使偏置结构将经历以及对这些结构的基于位移的设计方法的开发。

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