考虑信噪比和车-桥耦合效应的桥梁健康监测策略

发布时间：2019-01-02 13:26

【摘要】：为了舍弃大量信噪比低或无异常的数据,节约计算资源并提高分析效率,在理论依据的基础上实现具有针对性的桥梁健康监测,提出了考虑信噪比和车-桥耦合效应的桥梁监测策略.对监测信号成分进行分析,指出为了实现监测策略,需要根据车-桥耦合动力理论确定合理准确的监测阈值.将车群等效为具有主体部分和耦合均布质量的时变动力模型,建立桥梁结构与移动车群相耦合的动力平衡方程及其解析表达式.以一实际简支梁健康监测为例,根据车-桥耦合理论分析车群的均布质量、行驶速度以及振动频率对桥梁动力反应的影响,并结合实际监测数据确定监测阈值,实现监测策略.实验结果表明该监测策略有效.
[Abstract]:In order to discard a large amount of data with low signal-to-noise ratio (SNR) or no abnormal signal to noise ratio (SNR), save computing resources and improve the efficiency of analysis, the health monitoring of bridges can be realized on the basis of theoretical basis. A bridge monitoring strategy considering signal-to-noise ratio (SNR) and vehicle-bridge coupling effect is proposed. Based on the analysis of monitoring signal components, it is pointed out that in order to realize the monitoring strategy, it is necessary to determine a reasonable and accurate monitoring threshold according to the vehicle-bridge coupling dynamic theory. The vehicle group is equivalent to the time-varying dynamic model with the main body part and the coupled uniform mass, and the dynamic equilibrium equation and its analytical expression of the bridge structure coupled with the mobile vehicle group are established. Taking the health monitoring of a simple supported beam as an example, according to the vehicle-bridge coupling theory, this paper analyzes the influence of vehicle mass, speed and vibration frequency on the dynamic response of the bridge. Combining with the actual monitoring data, the monitoring threshold is determined and the monitoring strategy is realized. The experimental results show that the monitoring strategy is effective.
【作者单位】：北京工业大学建筑工程学院工程抗震与结构诊治北京市重点实验室;大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金资助项目(51108009) 高等学校博士学科点专项科研基金资助项目(20111103120022)
【分类号】：U446

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