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V magistrski nalogi smo zasnovali, analizirali ter dimenzionirali nosilno konstrukcijo prednapetega armiranobetonskega mostu preko reke Save Dolinke v kraju Piškovca. Konstrukcija mostu je izdelana iz visokotrdnega betona. Glede na pogoje okolja smo določiti zunanje vplive, ki delujejo na konstrukcijo ter opisali reološke procese v visokotrdnem betonu. Določili smo tudi prometno obtežbo mostu. V okviru preliminarne analize smo izbrali debelino krovnega sloja betona, določili smo obliko in dimenzije prečnega prereza mostu ter potrebno število prednapetih kablov. Predpostavili smo spremenljiv prečni prerez ter konstrukcijo analizirali za stalna in začasna projektna stanja. V okviru analize smo določili tudi izgube sile prednapenjanja v kablih ter izračunali potrebno napenjalno silo na sidrni glavi ter izvedli globalno stabilnostno analizo konstrukcije. Na podlagi rezultatov analiz smo najprej preverili osno-upogibno in strižno odpornost konstrukcije v prečni smeri (pravokotno na os vozišča) ter določili potrebno armaturo. V mejnih stanjih uporabnosti smo preverili nivo napetosti ter širino razpok. Nato smo preverili še osno-upogibno in strižno odpornost konstrukcije v vzdolžni smeri. Sočasno smo kontrolirali tudi nosilnost delovnega stika. V mejnih stanjih uporabnosti smo preverili nivo napetosti ter povese konstrukcije. Vse kontrole smo izvedli s pomočjo programske opreme Sofistik (SOFiSTiK AG, 2018). Ugotovili smo, da z materialnimi in geometrijskimi parametri ter stopnjo prednapetja, določenimi v okviru preliminarne analize mostne konstrukcije, v globalni analizi zadostimo vsem izvedenim kontrolam mejnih stanj konstrukcije. In the thesis, we designed, analyzed and dimensioned a prestressed reinforced concrete bridge over the Sava Dolinka River in the village of Piškovca. The bridge structure is made of high-strength concrete. Depending on the environmental conditions, we have determined the external influences that affect the structure and described the rheological processes in high-strength concrete. We also determined the traffic load on the bridge. In the preliminary analysis, the thickness of the concrete cover layer was selected, the shape and dimensions of the cross-section of the bridge were determined, as well as the required number of prestressed tendons. We used a variable cross-section and analyzed the construction for ultimate limit state and serviceability limit state. In the analysis, we also determined the losses of prestressing force in the tendons, calculated the required tensile force at the anchor head, and performed a global stability analysis of the structure. Based on the results of the analysis, we first checked the axial-flexural and shear resistance of the structure in the transverse direction (perpendicular to the axis of the carriageway) and determined the required reinforcement. In the of serviceability limit state we checked the level of stresses and width of the cracks. Then we checked the axial-flexural and shear resistance of the structure in the longitudinal direction. At the same time, we also checked the load bearing capacity of the working contact of concrete. In the serviceability limit states, we checked the level of stresses and displacements of the structure. All controls were performed using Sofistik software (SOFiSTiK AG, 2018). We have found that with the material and geometric parameters and the degree of prestress determined in the framework of the preliminary analysis of the bridge structure, in the global analysis, we satisfy all the performed checks of the limit states of the structure. |
