钢管混凝土拱桥吊杆损伤分布式识别

Distributed damage detection on hangers of concrete-filled steel tubular arch bridge

随着工程结构的日益大型化和复杂化,结构损伤检测时需要布置大量的传感器.传统的集中采集和处理的技术将难以胜任海量数据的处理要求.有利于降低成本,密集布置的无线智能传感器就成为大型结构健康监测系统的最佳选择.采用分布式损伤识别方法是密集布排的无线传感测试系统的必然要求.针对拱桥吊杆损伤的问题提出应用于无线传感网络的分布式识别技术.以一混凝土钢管拱桥为实验平台,松动吊杆端部锚具制造不同程度的松弛损伤,对损伤前后拱桥进行振动测试,按照网络拓扑情况,利用功率谱密度曲率差法进行损伤识别分析.结果表明:分布式损伤识别技术能够成功识别拱桥吊杆损伤,并且该方法可以应用到其他密集布排无线传感器的大型复杂结构的健康监测和检测中.

As civil infrastructures become larger and more complex, a dense array of sensor must be available for structural health monitoring, which is a big challenge to conventional wired sensors with centralized processing technique. Wireless smart sensors which have realized low-cost and densely installation offer a unique opportunity for large-scale structure. Distributed method is required in such system. A decentralized strategy is applied on detecting damage of arch bridge hangers for smart sensor networks. Vibration testing is implemented on a concrete-filled steel tubular arch bridge model. Damage was introduced by releasing the bolts of hangers in different level. The curvature difference of power spectral density is used to detecting damage with decentralized technology. The result shows that the approach can locate damage efficiently, and it also can be used on other large-scale structures with a large number of sensors.