振动环境对基于压力变送器的桥梁主梁变形监测影响研究

发布时间：2018-01-19 14:41

本文关键词： 桥梁健康监测桥梁主梁挠度连通管系统准静挠度动挠度　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：大跨桥梁在其运营过程中会受到多种环境和荷载的作用而导致主梁产生变形，，主梁挠度随时间的积累最终可能导致桥梁破坏，所以对桥梁主梁挠度进行长期实时监测已经成为桥梁健康监测的重要环节。对于桥梁挠度的监测，国内外研究了许多方法，其中应用最多的是连通管式挠度监测系统。但该方法在使用过程中会受到液体密度、液体大流动、水管选材及尺寸、测量环境重力场等因素的制约，测量精度尚有待提高。为此，本文采用半封闭连通管系统对液体的大流动进行限制，优化连通管桥梁挠度系统的性能,对压力场式连通管桥梁挠度监测技术进行分析和测试，研究分析了振动对系统测试精度的影响。本文主要内容如下：应用ANSYS/LS-DYNA对基站水箱的液面晃动进行仿真模拟，对不同振动位移频率和不同位移幅值下水箱的底部压力进行模拟分析，讨论了两种工况下液体压力变化对转换得到的位移的影响，间接地获得其对连通管桥梁挠度监测系统精度的影响。在黄河滨州大桥的缩尺模型上搭建了连通管桥梁挠度监测系统，在静载、单点激振施加静载和行人工况下分别进行了连通管系统的性能试验，分析了该系统对静挠度、准静挠度和动挠度测量的精度。获得了连通管系统的频响范围，验证了该挠度监测系统适合于低频振动挠度的测量。对南溪长江大桥和清水浦大桥上的连通管桥梁挠度监测系统测量结果进行相关分析。就温度变化和车载引起的挠度变化分析，检验了连通管系统在实际桥梁准静挠度测量的可靠性。对连通管桥梁挠度监测系统与GPS位移监测系统的结果进行对比统计分析，得到连通管系统对实际桥梁动挠度的测量精度。
[Abstract]:The long - term real - time monitoring of the deflection of the main beam of the bridge has become an important part of the bridge ' s health monitoring . By using ANSYS / LS - DYNA , the liquid level slosh of the base station water tank is simulated , the bottom pressure of the water tank under different vibration displacement frequencies and different displacement amplitudes is simulated and analyzed , and the influence of the change of the liquid pressure on the displacement obtained by the conversion under the two working conditions is discussed , and the influence of the liquid pressure change on the accuracy of the deflection monitoring system of the communicating pipe bridge is indirectly obtained . On the scale model of the Yellow River Binzhou Bridge , the deflection monitoring system of the communicating pipe is built . The performance test of the communicating pipe system is carried out under the static load and single point excitation . The accuracy of the system for static deflection , quasi - static deflection and dynamic deflection is analyzed . The frequency response range of the communicating pipe system is obtained , and the deflection monitoring system is proved to be suitable for the measurement of the deflection of low frequency vibration . In this paper , the measurement results of the deflection monitoring system of the communication pipe bridge on Nanxi Yangtze River Bridge and Qingshuipu Bridge are analyzed . The reliability of the measurement of the quasi - static deflection of the communicating pipe system in the actual bridge is verified by the analysis of the temperature change and the deflection change caused by the vehicle - mounted bridge . The results of the deflection monitoring system and the GPS displacement monitoring system are compared and analyzed , and the measurement accuracy of the dynamic deflection of the communicating pipe system is obtained .

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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