Combining with the actual situation of 300m pylon of Su-tong Bridge, the feasibility that GPS technology is applied in
monitoring of the pylon is analyzed. Starting from the survey principle of GPS technology, the error source and
weakening method is analyzed; the precision of kinematical surveying is estimated. According to the pylon dynamic
characteristic, the key technique and the implementation points are proposed that GPS is applied in gaining
three-dimensional dynamic information of the pylon. Specially, the sampling frequency and the coordinates system is
analyzed in detail. According to the actual test data, the wavelet analysis technology and the spectrum analysis
technology are separately used to research the dynamic movement of the pylon such as long and short periodic change,
the frequency and amplitude of vibration, and the result is compared with the design dynamic performance, they value is
quite coincidence. The experimental analysis indicated that, GPS technology could be used to survey the dynamic characteristic of tall and erect building same as of Cable-Stayed Bridge.
|