基于GNSS-RTK技术的超高层结构施工期水平变形实测

Horizontal Deformation Measuring of a Super High-rise Building During the Construction Stage Based on GNSS-RTK Technology

基于GNSS-RTK技术,对1栋超高层结构施工期的水平变形开展实测。结果表明,基于GNSS-RTK技术测得的时程曲线变化量在±10cm范围,监测结果符合静态GNSS精度要求。采用经验模态分解方法可有效消除周围环境、信号多路径效应、天气等因素造成的误差;由水平位移识别得到施工期塔楼在2个主轴方向的自振频率,2台GNSS流动站识别得到的自振频率非常接近,验证了GNSS-RTK技术的准确性和有效性。

Based on GNSS-RTK technology, the horizontal deformation of a super high-rise structure during construction stage is measured. The results show that the maximum variation of the whole time history curve measured by GNSS-RTK is no more than ± 10 cm, which is in line with the accuracy of static GNSS monitoring. Through empirical mode decomposition method, the errors caused by the surrounding environment, signal multipath effect, weather or other reasons can be effectively eliminated. The lowest order natural frequencies of the tower in the two main axes during construction can be identified from the horizontal displacement. The natural frequencies identified by the two GNSS are very close, which in turn verifies the correctness and effectiveness of the GNSS-RTK technology.