Seleção de pontos-objeto visando o monitoramento de estruturas a partir da propagação de erros por simulação
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Abstract
Errors are inherent in the measurement process. In practice, a number of procedures are performed in order to have greater control over these errors. The surveys activities with the goal of monitoring structures present uncertainties due to the instrumentation and the geometrical configuration of the monitoring network, the last one depending on the location of the total station in relation to the points that will be monitored (object-points). In this work, simulations are performed to predict the behavior of these propagated errors in the survey, considering the use of the free station (FS) method for total station (TS) orientation and the three-dimensional irradiation method for the monitoring of large civil structures, such as dams. The three-dimensional modeling and representation of the errors propagated on the structure is sought in order to support dams security technicians in the selection of object-points so that it is possible to use the spatial location required by the team of civil monitoring and also it is possible to presents the lowest values of variance. With the methodology of FS and three-dimensional irradiation, simulations were performed in a test area considering different positions for implantation of the support points for TS orientation, and different positions for TS used in the survey. The results of the research allowed observing how much the geometry referring to the position of the TS influences the errors that supposedly will be obtained in a survey. In addition, the propagated errors were represented three-dimensionally in the model of the evaluated structure.
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