McGeown Claire, Hester David, OBrien Eugene J, Kim Chul-Woo, Fitzgerald Paul, Pakrashi Vikram
School of Civil Engineering, University College Dublin, D04 V1W8 Dublin, Ireland.
School of Natural and Built Environment, Queen's University Belfast, Belfast BT9 5AJ, UK.
Sensors (Basel). 2024 Mar 5;24(5):1684. doi: 10.3390/s24051684.
This study proposes the new condition monitoring concept of using features in the measured rotation, or 'pitch' signal, of a crossing vehicle as an indicator of the presence of foundation scour in a bridge. The concept is explored through two-dimensional vehicle-bridge interaction modelling, with a reduction in stiffness under a pier used to represent the effects of scour. A train consisting of three 10-degree-of-freedom carriages cross the model on a profiled train track, each train varying slightly in terms of mass and velocity. An analysis of the pitch of the train carriages can clearly identify when scour is present. The concept is further tested in a scaled laboratory experiment consisting of a tractor-trailer crossing a four-span simply supported bridge on piers. The foundation support is represented by four springs under each pier, which can be replaced with springs of a reduced stiffness to mimic the effect of scour. The laboratory model also consistently shows a divergence in vehicle pitch between healthy and scoured bridge states.
本研究提出了一种新的状态监测概念，即利用交叉车辆测量的旋转或“俯仰”信号中的特征作为桥梁基础冲刷存在的指标。通过二维车桥相互作用建模对该概念进行了探索，桥墩下刚度的降低用于表示冲刷的影响。一列由三个具有10个自由度的车厢组成的列车在异形轨道上穿过模型，每列列车在质量和速度方面略有不同。对列车车厢俯仰的分析可以清楚地识别出何时存在冲刷。该概念在一个缩尺实验室实验中进一步得到验证，实验中一辆牵引拖车穿过一座由桥墩支撑的四跨简支桥。每个桥墩下由四个弹簧代表基础支撑，这些弹簧可以用刚度降低的弹簧代替，以模拟冲刷的影响。实验室模型也始终显示出健康桥梁状态和冲刷后桥梁状态下车辆俯仰的差异。
