Dam Deformation Measurements with GPS

Survey Review, 2009

Construction of large engineering structures is essential for the development of a nation. Though essential, under excessive loading, they are subjected to deformation, thereby affecting the safety of the structure. Hence, the safety of these large engineering works demands their periodic monitoring, involving in-depth analysis of their structural behaviour and response of the structure to parameters contributing to deformation. The paper gives an overview of the application of Geodetic GPS technique in structural deformation monitoring of a large engineering structure, the Koyna dam as a case study. For monitoring deformation of this dam, a GPS network had been established by Indian Institute of Technology Bombay and observed periodically from year 2000 – 2006. Extensive fieldwork, detailed data processing and data analysis were done, to estimate the deformation of the dam during the period of study. An attempt was made to study the dynamical behaviour of the dam with respect to th...

Ksce Journal of Civil Engineering, 2009

Tianjin Yonghe Bridge is one of the important infrastructures in China where it serves as the crucial links in the transport network. Monitoring and maintenance of this bridge are essential tasks in prolonging its life. In this paper, GPS system was used for deformation data collection. Two analytical methods namely; Kalman Filter (KF) and Parametric Least Square (PLS) were used for the adjustment of these data. The analysis of test results indicate that: (1) the traffic loads are the main factor affects bridge damage, (2) after ten months of traffic opening, the south tower of bridge was returned to its original case, and (3) the maximum deformation was pronounced 48.2 m far from the beginning abutment after six months of bridge opening.

2019

Civil engineering structures such as dams, bridges, tunnels, high rise buildings etc. are susceptible for deterioration over a period of time. Bridges in particular deteriorate after being constructed due to loading conditions, environmental changes, earth movement, material used during construction, age and widespread corrosion of steel. Bridge deformation monitoring is most important as it determines quantitative data, assesses the state of the structure and detects unsafe conditions at early stages and proposes necessary safety measures before can threaten the safety of vehicles, goods and human. Despite government’s efforts to construct roads and highways in most African countries, bridge deformation monitoring is not given priority and ultimately causes some bridges to collapse unexpectedly. In this paper we present a geodetic approach of bridge deformation monitoring of Lotsane bridge in Palapye, Botswana. The horizontal positions of reference and monitoring points were determ...

IJMER

It is well known that, deformation monitoring systems are considered, nowadays, to be the back bone factor for human safety as well as preserving the ultimate economy of his achievements. In this context, there has been always an increasing demand for precise deformation measurements in keeping up several engineering structures and historical monuments. Measuring and monitoring monumental deformation is the sequence of operations that allows the finding of movements of points or features in a specified coordinate system, during two different times for the same investigated feature. The time interval sometimes is the main factor in measuring horizontal deformation, especially in loading test of steel bridges. Hence, the present paper investigates the accuracy of the GPS in monitoring of horizontal deformation with respect to the time of observation. So, a practical simulation test was made to assess the accuracy of GPS with time in measuring horizontal deformation. The obtained results indicated that, the used methods and techniques presented in the current research paper have possessed a very good accuracy, reliability and applicability in monitoring horizontal deformations efficiently. The accuracy of measuring horizontal deformation of points on structure using relative static technique of GPS is from (0.1mm) to (1.8mm) for time interval from 30 minute to 5 minute and has R.M.S.E (0.3mm)

As the new materials and technologies are increasingly applied to construction of civil infrastruc-tures such bridges, dam and tunnels, the need for structural monitoring systems, maintenance and restoration becomes more important and vital. Bridges are widespread in every society and affect its human, social, economical and cultural aspects. Measurements and monitoring of the structural deformation of highway bridges have an essential role in structural safety. This paper investigates an integrated monitoring system for estimation of the deformation behavior of one of the important reinforced bridges in Egypt. The applied data for analysing the deformation of any structure from geodetic observations are the coordinates of several monitoring points distributed on the structure itself. The coordinates of these points are calculated with respect to control fixed points. So any deviations in the control points coordinates between the two successive epochs of observations will affect the values of structural deformation. To overcome this shortage, applying the mul-ti-parameter transformation will be studied in this paper for structural health monitoring of bridges. Statistical tests using F-Fisher criterion with a confidence level of 98% of the geodetic observations for bridge deformation values are also presented. The results of the practical measurements , analysis of the interesting deformation technique and traffic flow around the studied highway bridge are also presented. The resulting structural deformation values from statistical tests provide a significant improvement of understanding and prediction the structure deformation values of highway bridges.