Accuracy of trigonometric heighting and monitoring the vertical displacements

摘要

A lot has been written and said about the measuring of displacements and deformations of structures. This article introduces displacement measurements on the largest viaduct in Slovenia, and an analysis of the results, with particular stress on the accuracy of the calculations. Today there are a lot of sophisticated methods to measure and analyse a bridge during load tests as GPS, photogrammetric measurements, laser scanning, levelling with digital or laser levels, etc. Nevertheless, the use of classical techniques such as trigonometric heighting is still suitable enough for the most demanding field observations and demanded accuracy. In this article the most optimal accuracy for the needs of load tests is presented, the method of trigonometrical heighting is discussed in details as well as the example of its usage on the largest Slovene viaduct Crni Kal.