非接触式张力线桥梁挠度测量系统

Non-contact bridge deflection measurement system using weighted-stretched-wire

短期和长期挠度的测量是了解和评估土木工程结构行为的必要途径。为精确测量桥梁挠度,提出了一种非接触式张力线桥梁挠度测量系统(NWSWS),该系统具有高精度、低成本、适合于不间断在线监测等优点。阐述了NWSWS的组成与测量原理,分析了系统的测量精度和测量速度,根据系统的结构特点研究了系统可能产生误差的一些原因,对误差的大小进行了估算,提出了降低误差的应对方案。实验结果对该系统的性能进行了验证。目前该系统已运用于一座桥梁的在线挠度监测。

Short- and long-term deflection measurement is often a necessary step towards understanding and evaluating the behavior of civil engineering structures. A Non-contact weighted-stretched-wire system （NWSWS） for bridge deflection measurement is developed in this paper. The proposed system is promising due to its attractive features such as high precision, low implementation cost and suitability for continuous monitoring. The configuration of NWSWS and its measurement principle are presented. The system measurement precision and speed are analyzed. Some system error sources are addressed according to the structure characteristics of the system and the error value is evaluated. Experimental results verify the performance of this new system. This system has been applied to the monitoring of a real-world bridge.