大胜关大桥吊杆振幅的长期监测与分析

发布时间：2018-11-29 11:27

【摘要】：以大胜关大桥吊杆为研究对象,应用桥梁健康监测系统对高速列车通过时的吊杆振幅进行长期监测,研究不同荷载工况下吊杆振幅的长期时变规律。分析结果表明:高速列车通过时,吊杆纵向振幅响应大于横向振幅响应,吊杆纵向振幅和横向振幅长期变化曲线均呈现出明显的随机性;高速列车作用下吊杆的纵向振幅和横向振幅与列车车速、结构温度之间没有明显的相关性;采用log-logistic分布函数可以很好地描述各工况下吊杆横向振幅和纵向振幅的概率密度统计特性;通过确定各工况下吊杆振幅的分级预警阈值,可以有效评估吊杆的健康状态,为大胜关大桥的安全运营提供技术保障。
[Abstract]:This paper takes the suspenders of Dashengguan Bridge as the research object, applies the bridge health monitoring system to carry on the long-term monitoring of the boom amplitude while the high-speed train is passing, and studies the long-term time-varying law of the boom amplitude under different load conditions. The results show that the longitudinal amplitude response of the boom is larger than the lateral amplitude response when the high-speed train passes, and the long-term variation curves of the longitudinal amplitude and the transverse amplitude of the boom show obvious randomness. Under the action of high-speed train, there is no obvious correlation between longitudinal amplitude and transverse amplitude of suspension rod and train speed and structure temperature. The probability density statistical characteristics of the transverse and longitudinal amplitudes of the boom can be well described by using the log-logistic distribution function. By determining the tiered warning threshold of the boom amplitude under various working conditions, the health status of the suspender can be effectively evaluated, and the technical guarantee for the safe operation of the Dashengguan Bridge can be provided.
【作者单位】：南京工程学院建筑工程学院;东南大学混凝土及预应力混凝土结构教育部重点实验室;河北省大型结构健康诊断与控制实验室;
【基金】：国家重点基础研究计划(973计划)(2015CB060000) 国家自然科学基金(51578138) 河北省大型结构健康诊断与控制重点实验室开放课题(201502) 南京工程学院校级科研基金(YKJ201513)
【分类号】：U446

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