Determination of Vertical Movement for Deformation Monitoring of a Bridge Using GPS Technique

Abstract

Deformation analysis using height differences is imperative to the determination of vertical movements in engineering structures, landslide areas and crustal deformations. GNSS technology and data processing software have made these observations much more convenient, accurate and cost-effective tool for monitoring of natural and man-made structures. Here, we determine the vertical movement of a bridge with respect to control network established on stable grounds. These include pre-analysis, survey design, data collection, data reduction, adjustments determination of maximum expected displacement and its accuracy requirement. The observations are carried out in geodetic monitoring network in three epochs (2017, 2018 and 2019), and by this way stable network are verified. The instrument employed is Pro-mark3 and its accessories for measuring planimetric positions and elevations of points. Once the survey have been conducted, GNSS Solutions provides accurately determine site locations within the parameters establish. Least squares adjustment was used for rigorous adjustment of GPS carrier-phase measurements. The statistical test was carried out using Fisher Table and by computing T- test values. Finally the results obtained portrayed that the bridge, even though has minor vertical movement is found to be stable.

Keywords: Engineering Structure, Vertical Movement, Deformation Monitoring, GNSS, T-test