20.500.12556/RUL-179093 Temperaturni vpliv na armiranobetonske stebre v precizni geodetski izmeri doktorska disertacija The influence of temperature on reinforced concrete columns in precise geodetic measurements doctoral dissertation Kadar želimo določiti pomike kontrolnih točk, nameščenih na objektu ali tleh v njegovi okolici, potrebujemo dobro stabilizirane referenčne točke, ki morajo ostati v istem položaju med posameznimi meritvami. Ker so točke običajno stabilizirane v naravi, so neprestano izpostavljene spreminjajočim se naravnim razmeram. Stabilnost referenčne točke ima pomemben vpliv na natančnost izvedenih geodetskih meritev. Zraven različnih pomikov tal lahko na položaj teh točk, ki so stabilizirane s stebri, delujejo tudi vplivi toplotne obtežbe zaradi sončnega obsevanja. Te obtežbe povzročajo pomike stebrov za meritve, zaradi česar se premakne vijak za prisilno centriranje, ki je pritrjen na vrh stebra, na katerega namestimo instrument ali reflektor. Če uporabimo takšen steber ali točko za meritve, lahko zaradi pomika stebra v naših meritvah nastopijo pogreški merjene dolžine ali horizontalnih smeri. Vpliv temperaturnih razlik v stebru, ki nastanejo zaradi sončnega obsevanja, je na položaj vijaka za prisilno centriranje instrumenta ali reflektorja lahko tako velik, da v preciznih geodetskih meritvah ni več zanemarljiv. Doktorska disertacija obravnava temperaturni vpliv na armiranobetonske stebre, ki služijo kot stabilizacija referenčnih točk, in posledice teh deformacij na natančnost meritev. Določili smo računski model za napoved pomikov, ki nastanejo kot posledica toplotne obtežbe stebra. Rezultate računskega modela smo primerjali z rezultati, pridobljenimi iz poskusa v laboratoriju, in analizirali vpliv pogreška zaradi pomika stebra na precizne geodetske meritve. V kontroliranih laboratorijskih pogojih smo z ene strani ogrevali steber in pri tem hkrati merili pomike, zasuke in temperature. Iz izsledkov laboratorijskih analiz smo ugotavljali temperaturno porazdelitev v stebru ter ocenili primernost posredne metode za določitev pomika vrha stebra iz izmerjenih zasukov vrha stebra. Posredno določanje pomikov iz izmerjenih zasukov vrha stebra s pomočjo inklinometra je zelo perspektivna metoda, saj je v naravi preprosto izvedljiva v primerjavi z metodo neposrednega merjenja pomika z merilci pomika, ki je zelo težko izvedljiva. When determining the displacements of control points installed on a structure or on the surrounding terrain, it is important to use well-stabilized reference points that remain stable between successive measurements. In practice, these points are often stabilized in the natural environment, where they are exposed to changing conditions. The stability of a reference point significantly influences the accuracy of geodetic measurements. In addition to the various ground movements, the position of these points, often stabilized by pillars, is also affected by thermal load caused by solar radiation. Such thermal effects can lead to displacements of the measuring pillars, leading to shifts the screw for forced centering mounted at the top of the pillar, which serves as an attachment point for an instrument or reflector. If such a pillar or point is used for measurements, the displacement of the pillar can lead to errors in the measured lengths or horizontal directions. The impact of temperature-induced differences within the pillar, caused by solar radiation, on the position of the screw for forced centering for attaching the instrument or reflector can be significant and cannot be ignored in geodetic precision measurements. The doctoral dissertation addresses the thermal influence on reinforced concrete pillars used for stabilizing reference points and the consequences of these deformations on measurement accuracy. We developed a computational model to predict displacements caused by thermal loads. The results of the computational model were compared with the results obtained from a laboratory experiment, and we analyzed the influence of errors due to pillar displacements on precise geodetic measurements. Under controlled laboratory conditions, we heated the pillar from one side while simultaneously measuring displacements, rotations, and temperatures. Based on the results of the laboratory analyses, we determined the temperature distribution within the pillar and evaluated the suitability of an indirect method for determining the displacement of the top of the pillar from measured rotations near the top of the pillar. The results demonstrate that this indirect approach with inclinometers offers a practical and reliable alternative to direct displacement measurement using displacement sensors, especially in field applications where methods based on displacement sensors are difficult to implement. doktorske disertacije geodezija grajeno okolje referenčna točka toplotna obtežba temperaturna porazdelitev upogib pomik zasuk kontrolne meritve built environment life cycle assessment geodetic reference pillar thermal loading temperature distribution bending displacements rotations control measurements true false false [R. Močnik] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2026-02-05 08:45:06 2026-02-05 08:45:20 2026-02-25 14:33:58 0000-00-00 00:00:00 2026 0 Ljubljana 2026 Ljubljana XVIII, 70 str., [6] str. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 528.31:544.032.4:624.012.35(043.3) 179046 269639939 20860.pdf 20860.pdf 1 32C4813258798481B93BB1D1D635AC5A 97bcf33e183ff7cdb2f3b4e1f63dada229714198d7cdfb77f1269a00bfd3d0a9 89b327bf-0266-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227221 20861.pdf 20861.pdf 1 7E9A61BCA1D131250629878EF22566D4 5a62161b965fde95ad6c1b31717c089d661f4c25b47503c48e26c85771985655 89b3e9c3-0266-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227222 20862.pdf 20862.pdf 1 170DAB8E9C06D128F46F4DAE7516D4EE cef2b32aa74d2a9432fa11feaec8247fc65ac53ce980b5a0690b50c867261e4c 89b7b68b-0266-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227223 20863.pdf 20863.pdf 1 2135F5F96C9BF04AB1F2BA6FEE6AFE36 c7f129111baf6f6f68487b6a00f0ef40af5590b093c14558ae7a8296337ff159 89b838b0-0266-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227224 Fakulteta za gradbeništvo in geodezijo 0 0 0