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目前桥梁健康监测在海量数据采集、分析和存储等方面存在不足,限制了健康监测的应用和推广.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监测,提出考虑信噪比和车-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,验证了分析方法及监测策略的有效性.
At present bridge health monitoring has some shortages in mass data collection, analysis and storage, which limits the application and promotion of health monitoring.In order to discard a large number of data with low SNR or no abnormality, to save computing resources and improve analysis efficiency, Based on the vehicle-bridge coupling dynamic theory to determine the reasonable and accurate method to realize the monitoring strategy based on the vehicle-bridge coupling dynamic theory to achieve the targeted monitoring, and put forward the bridge monitoring strategy considering the signal to noise ratio and the vehicle-bridge coupling effect. The threshold value of the vehicle group is equivalent to the time-varying dynamic model with the mass of the main body and the coupling uniform mass, and the dynamic balance equation and its analytical expression are established to couple the bridge structure with the moving vehicle group. Based on the vehicle-bridge coupling theory, this paper analyzes the influence of the uniform mass, traveling speed and vibration frequency on the dynamic response of the bridge. Based on the actual monitoring data, the monitoring threshold is determined and the monitoring strategy is verified. The analysis methods and monitoring strategies Effectiveness.