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以微电子器件为核心构成的桥梁结构状态监测系统与以钢筋、水泥构造的桥梁之间存在的巨大寿命差异,使得监测仪器的修复和更换成为必然。修复和更换传感器的过程会造成监测数据出现前后不一致性问题,影响到整个桥梁结构状态监测系统的正常工作,而传统上通过重新找一个准恒载工况下的新初始基准点方法在实践中很难得以实现。以桥梁结构状态监测系统中常用的连通管光电挠度系统为研究对象,以监测系统中一个重要监测指标———挠度为研究目标,在分析了连通管光电挠度系统工作原理基础上,对连通管光电挠度系统传感器维修前后导致前后挠度数据不一致的各种因素进行了深入研究,以准恒载工况为基准建立了挠度修正数学模型,在此基础上提出了一种挠度自适应修正方法。该方法有效地解决了挠度数据前后不一致性问题,并在重庆市石板坡长江大桥结构状态监测系统得以成功验证。
The huge life difference between the bridge structure condition monitoring system which is composed of microelectronic devices as the core and the bridges which are constructed of steel bars and cement makes the repair and replacement of the monitoring instruments become inevitable. The process of repairing and replacing the sensor will cause inconsistency of the monitoring data before and after, affecting the normal operation of the whole bridge structural condition monitoring system. Traditionally, by finding a new initial reference point under a quasi-constant load condition in practice Difficult to achieve. Based on the principle of deflection, which is one of the most important monitoring indicators in the monitoring system, this paper takes the photoelectricity deflection system of the connecting pipe commonly used in the bridge structure condition monitoring system as the research object. Based on the analysis of the working principle of the photoelectric deflection system of the connecting pipe, The various factors that lead to the inconsistency of the front and back deflection data before and after the photoelectric deflection system sensor maintenance are studied in depth. Based on the quasi-constant load condition, a mathematical model of deflection correction is established. Based on this, a self-adaptive deflection correction method is proposed. The method effectively solves the problem of inconsistency before and after the deflection data, and successfully verifies the structural status monitoring system of the Shibanpo Yangtze River Bridge in Chongqing.