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Uklon vzdolžne armature pri potresnem odzivu armiranobetonskih stebrov : diplomska naloga
Kovač, Rok (Author), Isaković, Tatjana (Mentor) More about this mentor... This link opens in a new window, Anžlin, Andrej (Co-mentor), Logar, Janko (Thesis defence commission member), Hozjan, Tomaž (Thesis defence commission member), Srpčič, Stane (Thesis defence commission member)

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Abstract
Tako eksperimentalne raziskave, kot analize stavb in mostov po potresih kažejo, da pri armiranobetonskih stebrih obremenjenih s seizmično obtežbo pogosto pride do uklona vzdolžne armature. Na pojav uklona vzdolžne armature, njegovo numerično modeliranje, ter njegov vpliv na duktilnost armiranobetonskih stebrov smo se osredotočili v tem delu. Povzeli smo del dosedanjih raziskovalnih naporov na področju. Nato smo opisali numerične modele za nelinearno analizo armiranobetonskih stebrov in materialne modele s katerim modeliramo uklon vzdolžne armature. Iz baze eksperimentalnih rezultatov armiranobetonskih elementov smo izbrali skupino preizkušancev pri katerih je med eksperimentom prišlo do uklona vzdolžne armature. Iz histereznih odzivov, ki so bili podani v bazi, smo določili dosežene mejne pomike preizkušancev. Z nelinearno analizo smo izračunali mejne pomike preizkušancev z - in brez modeliranja uklona. Izračunane mejne pomike smo primerjali z mejnimi pomiki, ki smo jih določili iz eksperimentalno izmerjenih histerez. Za izbrani preizkušanec smo izračunali tudi histerezni odziv z uporabo različnih končnih elementov, ki so na voljo v programu OpenSees. Ugotovljeno je bilo da ima uklon majhen vpliv pri armiranobetonskih elementih, ki imajo razmerje med vzdolžnim razmikom stremen in premerom vzdolžne armature manjše od 6 in imajo zadosten premer stremenske armature. Trenutni računski modeli uklona vzdolžne armature, sicer dobro zajamejo padanje tlačne odpornosti armature, vendar pa imajo kljub temu probleme pri napovedi mejnih pomikov celotnega elementa. Za boljše modeliranje odziva armiranobetonskih stebrov bi bilo potrebno razviti materialne modele, ki bi upoštevali interakcijo med objetim betonskim jedrom in vzdolžno armaturo.

Language:Slovenian
Keywords:gradbeništvo, UNI, dipl., uklon vzdolžne armature, razmerje med nepodprto dolžino in premerom vzdolžne armature, mejni pomik armiranobetonskega elementa, analiza moment ukrivljenost, lamelni element, histerezna krivulja
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2015
Publisher:[R. Kovač]
Number of pages:XI, 118 str., 5 pril.
Place:Ljubljana
UDC:624.042.7(043.2)
COBISS.SI-ID:6999649 Link is opened in a new window
Views:1084
Downloads:362
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Secondary language

Language:English
Title:Buckling of longitudinal reinforcement in RC columns subjected to seismic load
Abstract:
Experimental research, as well as analysis of buildings and bridges damaged in earthquakes shows that in reinforced concrete columns longitudinal reinforcement often buckles under seismic loads. The onset of phenomena, the numerical modelling and effect of phenomena on the ductility of reinforced concrete columns are the focus of this thesis. We have summarized a portion of the current research efforts in the field. Then we have described numerical models for nonlinear analysis of reinforced concrete columns and material models which are used to describe buckling of longitudinal reinforcement. From a wider database of experimental data we have selected a group of specimens that shows signs of buckling. Experimentally observed ultimate displacements of selected specimens were determined from hysteretic responses that were included in the database. We have conducted nonlinear analysis to predict ultimate displacements of specimens, with or without buckling. Calculated ultimate displacements were compared with experimentally observed. For one specimen we have calculated hysteretic response using different finite elements available in OpenSees. We have gathered that the buckling of longitudinal reinforcement has little influence on columns that have unsupported length to bar diameter ratio smaller than 6 and have adequate diameter of transverse reinforcement. Although existing numerical models can describe lower resistance of the reinforcing bar in compression, they still have problems predicting displacements of the whole column. For better modelling of reinforced concrete columns models that take into account the interaction between confined concrete core and longitudinal reinforcement should be developed.

Keywords:graduation thesis, civil engineering, buckling of longitudinal reinforcement, ratio of unsupported length and the diameter of the longitudinal reinforcement, ultimate displacement of reinforced concrete element, moment curvature analysis, fiber element, hysteretic curve

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