利用GPS测定大型桥梁动态特性的试验及结果

Experiment and Result for Measuring Dynamic Characteristics of Large Bridge Using GPS

为研究GPS测定桥梁结构自振特性的可行性 ,结合武汉长江二桥开展了一次GPS动态监测试验工作 ,介绍了试验实施方案及其监测结果。通过应用频谱分析法 ,有效地获取了斜拉桥跨中的振动特征 ,其结果与竣工时采用加速度计实测的值十分吻合。研究表明 ,应用高采样率的GPS接收机和合理的数据处理方法 。

This paper proceedes the actual test work for GPS dynamic monitoring, and introduces the experimental implementing scheme, data processing method and monitoring result. This paper availably obtains the vibration characteristics in the middle span of cable-stayed bridge by using the spectral analytic approach. The result and the surveying value obtained by the accelerometer when the bridge was completed are very identical. The results have shown that, with GPS receiver of the high sampling rate and suitable data processing method, the vibration characteristics of the bridge structure can be determined with high accuracy.