20.500.12556/RUL-175328 Napovedovanje odziva armiranobetonskih stebrov v požarni peči magistrsko delo prediction of the response of reinforced concrete columns in a fire furnace master thesis Namen magistrske naloge je bila računalniška simulacija pričakovanega okvirnega odziva šestih betonskih stebrov velikega merila, ki bodo v prihodnjem letu testirani v požarni peči novega Požarnega laboratorija v Logatcu. Namen požarnih testov bo oceniti vpliv različnih parametrov, kot so višina neposredno segrevanega območja stebra, velikost in ekscentričnost obtežbe ter gostota prečne armature na pojav eksplozivnega luščenja betona, izvedene numerične simulacije pa bodo služile njihovemu lažjemu načrtovanju in izbiri najustreznejše merilne opreme. Simulacije smo izvedli v programu Abaqus. Najprej je bila izvedena temperaturna analiza, s katero so bili določeni temperaturni profili po prerezu elementov, nato pa še mehanska analiza, ki je omogočila oceno nosilnosti, deformacij in napetostnih stanj med požarno obremenitvijo. Rezultati so pokazali, da višina segrevanega območja stebra pomembno vpliva na uklonsko obliko in čas porušitve stebra, manj pa na napetostno stanje najbolj obremenjenega prereza v zgodnejših fazah požara in s tem predvidoma tudi manj na potek potencialnega eksplozivnega luščenja prereza. Večja ekscentričnost obtežbe zmanjša požarno odpornost stebra, medtem ko jo gostejša razporeditev stremen nekoliko izboljšuje. Pojav luščenja bo verjetno najbolj izrazit pri stebru, obremenjenim z ekscentrično obtežbo, vzorec luščenja pa bo tu izraziteje nesimetričen. The aim of this master’s thesis was to carry out numerical simulations of the expected structural response of six large-scale concrete columns that will be tested next year in the fire furnace of the new Fire Laboratory in Logatec. The purpose of the fire tests is to assess the influence of various parameters—such as the height of the directly heated zone of the column, the magnitude and eccentricity of the applied load, and the density of transverse reinforcement—on the occurrence of explosive spalling of concrete. The numerical simulations were intended to support the planning of these tests and the selection of the most appropriate measuring equipment. The simulations were performed using the Abaqus software. First, a thermal analysis was conducted to determine the temperature profiles across the cross-sections of the specimens, followed by a mechanical analysis to evaluate load-bearing capacity, deformations, and stress states under fire exposure. The results showed that the height of the heated zone has a significant effect on the buckling mode and failure time of the columns, but a smaller influence on the stress state of the most loaded cross-section in the early stages of fire exposure, and therefore presumably also less impact on the development of potential explosive spalling. Increased eccentricity of the applied load reduces the fire resistance of the column, while denser stirrup spacing provides a slight improvement. Spalling is expected to be most pronounced in the column subjected to eccentric loading, with a distinctly asymmetric spalling pattern in that case. magistrska dela gradbeništvo požarna analiza Abaqus armiranobetonski steber toplotna analiza mehanska analiza eksplozivno luščenje betona master thesis civil engineering fire analysis Abaqus reinforced cocnrete column thermal analysis structural analysis explosive spalling of concrete true false false [A. Konkolič] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-10-24 08:45:05 2025-10-24 08:45:09 2025-12-10 03:36:43 0000-00-00 00:00:00 2025 0 Ljubljana 2025 Ljubljana 1 spletni vir (1 datotek PDF (VIII, 50 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.942:519.6:666.98(043.2) 175602 254896131 20181.pdf 20181.pdf 1 621358339B3077A6FAD4AF2A40333349 358bc2146fc82d5f3034bad978c864f15beafc68f3cbcc5d9caf863d84ecaa10 b1c98c83-b0a4-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=220776 Fakulteta za gradbeništvo in geodezijo 0 0 0