magistrsko delo
Robert Močnik (Author), Tomaž Ambrožič (Mentor), Mojca Kosmatin Fras (Thesis defence commission member), Aleš Marjetič (Thesis defence commission member), Dušan Kogoj (Thesis defence commission member), Božo Koler (Co-mentor), Dejan Zupan (Co-mentor)

Abstract

Za geodetska opazovanja pomikov tal in grajenih objektov potrebujemo dobro stabilizirane referenčne točke, iz katerih merimo kontrolne točke na objektu ali v njegovi okolici. Te so najpogosteje stabilizirane z armiranobetonskimi stebri, ki so včasih neprimerno izgrajeni. To ima lahko v primeru temperaturnih razlik v stebru vpliv na položaj vijaka za prisilno centriranje, ki za precizne meritve ni zanemarljiv. V nalogi je s pomočjo prenosa varianc in kovarianc ter s simulacijo Monte Carlo analiziran vpliv pogreška položaja stojišča, orientacijske točke in kontrolne točke na rezultate izmere. Izveden je bil tudi poskus, pri katerem smo iz ene strani ogrevali steber in opazovali, kolikšen je dejanski pomik vijaka za prisilno centriranje. V času ogrevanja stebra smo tudi opazovali, kako se temperatura prenaša po stebru in kolikšno temperaturno razliko v stebru to povzroči. Ugotovili smo, da je pri temperaturni razliki 16,8 °C v stebru dejanski pomik vijaka približno 1 mm, kar za precizne meritve ni zanemarljivo.

Keywords

geodezija;magistrska dela;vplivi na meritve;temperaturne spremembe;pomik stebra;elipsa pogreškov;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [R. Močnik]
UDC: 528.481(043.2)
COBISS: 7582561 Link will open in a new window
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Downloads: 535
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Other data

Secondary language: English
Secondary title: Temperature effect analysis of reinforced concrete observation columns
Secondary abstract: Geodetic observations of displacements of the ground and engineering structures require wellstabilized reference points, used for measuring control points on the structure itself or in its surroundings. These points are most commonly stabilized with reinforced concrete columns, which are sometimes built improperly. If there are temperature differences within a column, this can have an impact on the position of the fixed screw for forced centering which is not negligible for precision measurements. By using the propagation of variances and covariances and Monte Carlo simulation, the thesis provides an analysis of the impact of error of the station position, orientation point and control point on the surveying results. We also carried out an experiment where we heated a column from one side and then observed the actual extent of screw displacement. While heating the column we also observed temperature transmission through the column and temperature difference this causes in the column. We have found that there was 1 mm screw displacement at temperature difference of 16,6 °C within the column which is not negligible for precision measurements.
Secondary keywords: geodesy;master of science thesis;observational effects;temperature gradient;cantilever column displacement;error ellipse;
File type: application/pdf
Type (COBISS): Master's thesis
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: XVIII, 87 str., 5 pril.
ID: 9170595