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Monitoring Bridge Deformation Using Auto-Correlation Adjustment Technique for Total Station Observations

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Author(s): Ashraf Abd El-Wanis Beshr | Mosbeh R. Kaloop

Journal: Positioning
ISSN 2150-850X

Volume: 04;
Issue: 01;
Start page: 1;
Date: 2013;
Original page

Keywords: Monitoring | Total Station | Auto-Correlation | Bridges | Deformation

ABSTRACT
Bridges are omnipresent in every society and they affect its human, social, ecological, economical and cultural aspects. This is why a durable and safe usage of bridges is an imperative goal of structural management. Measurement and monitoring have an essential role in structural management. The benefits of the information obtained by monitoring are apparent in several domains. In deformation analysis, the functional relationship between the acting forces and the resulting deformations should be established. If time depending observations are given, a regression could be used as a functional model. In case of stochastic model uncorrelated observations with identical variance are assumed. Due to the high sampling rate, a small time difference arises between two observations. Thus the assumed stochastic model is not suitable. The calculation has to be effected by means of auto-correlated observations. This paper investigates an integrated monitoring system for the estimation of the deformation (i.e., static, quasi-static) behavior of bridges from total station observations and studies the effect of autocorrelation technique on the accuracy of the estimated parameters and variances. The results have shown that autocorrelation technique is reduced the standard deviation of X&Y-direction about 6.7% to 29.4% and 6.5% to 15.5% of the original value, respectively, but the situation was differ in Z direction; the standard deviation in vertical component Z was increased.
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