摘要
本文针对压力场连通管桥梁位移监测系统动态效应问题,根据连通管的基本原理,基于结构动力学理论,考虑结构振动对连通管内液体压强的影响,将结构振动引起的位移动态效应作为测量误差,建立了连通管动态压强理论计算公式,以及桥梁结构动态位移的误差修正计算公式,并进行了模型试验。理论计算值与试验值吻合较好,验证了理论公式的正确性。参数分析及2座背景桥梁计算显示,桥梁结构动态位移监测的误差修正量,与管道纵向布置倾角呈正相关关系,随测点至管道最高点加速度分布的总量增大而线性增大。研究结果对于提高桥梁健康监测系统动态挠度测量精度,准确评估桥梁结构工作性能,具有重要的意义。
For the dynamic effect problem of connecting pipe method used in the bridge hydraulic displacement monitoring system,on the basis of connecting pipe principle and structural dynamics theory,considering the structure vibration influence on the liquid pressure in the monitoring system,two formulas,the dynamic pressure theory calculation formula and the error correction formula of the dynamic displacement for the bridge,are derived.A model experiment is carried out to verify the formulas,which shows that the experimental results meet the theory well.According to the parameter analysis and FEM results for the two bridges,we find that the error correction of the dynamic displacement is positively related to pipe longitudinal gradient and pipe acceleration.The research results are valuable for improving the dynamic deflection measurement accuracy for the bridge health monitoring system,and can be used to accurately evaluate the bridge performance.
出处
《地震工程与工程振动》
CSCD
北大核心
2013年第3期176-182,共7页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51078093
11272095)
广东省科技计划项目(2011B010300026
2012B04032005)
广州市科技计划攻关重大专项(2011Y2-00006)
广东省教育厅科技创新重点项目(2012CXZD0028)
关键词
连通管
桥梁
健康监测
动态位移
动态液压
误差修正
connecting pipe
bridge
health monitoring
dynamic displacement
dynamic hydraulic
error correction
