Seismic analysis of a reinforced concrete frame with infills and the influence of masonry infills on the tranverse reinforcement of the column

V diplomski nalogi je izvedena potresna analiza armiranobetonske okvirne stavbe in enake stavbe z upoštevanjem vpliva opečnih polnil. Glede na to, da vpliv polnil poveča togost konstrukcije, lokalno pa polnilo poveča strižno obremenitev stebra je ovrednoten vpliv potrebne količine prečne armature v stebru konstrukcije s polnili oziroma brez polnil. Potresna analiza konstrukcije je bila izvedena s programom SAP2000. V prvem delu diplomske naloge je predstavljena konstrukcija preučevane stavbe. Temu sledi predstavitev standardov Evrokod, ki so obvezni pri projektiranju gradbenih konstrukcij, saj to predpisuje trenutno veljavni Pravilnik o mehanski odpornosti in stabilnosti objektov. V drugem delu naloge je prikazana analiza in dimenzioniranje prečne armature za izbran steber obravnavanega okvira in okvira s polnili. Ker standard ne predpisuje načina modeliranja polnil pri potresni analizi, je bil vpliv polnil modeliran z nadomestnima diagonalama v vseh poljih okvira, kjer je prisotno polnilo. Analiza pokaže, da vrednost nihajnega časa konstrukcije s polnili predstavlja 30% vrednosti nihajnega časa čistega okvira. Posledično je celotna potresna sile pri konstrukciji s polnili približno trikrat večja od projektne potresne sile na okvir tako v smeri X, kot tudi v smeri Y. Zaradi precej večje togosti okvira s polnili se izkaže, da horizontalni pomiki, kot tudi relativni pomiki etaž, pri konstrukciji s polnili predstavljajo le 15% vrednosti tako horizontalnih pomikov kot tudi relativnih pomikov etaž pri konstrukciji brez polnil, pri kateri je bilo treba upoštevati tudi povečanje obremenitev zaradi vpliva teorije drugega reda. Glavna razlika pa se pokaže pri prečni armaturi, saj je treba pri določitvi projektne prečne sile na steber upoštevati tudi vpliv nosilnosti polnila.The seismic analysis of the reinforced concrete frame building and the same building with masonry infills was performed in the thesis. Since the influence of the masonry infills increases the stiffness of the structure and also locally increases the shear force in the column, the amount of transverse reinforcement in the column of the structure was also investigated. The seismic analysis of the structures was carried out by the SAP2000 program. In the first part of the thesis, the building’s structure is presented. This is followed by a presentation of the Eurocode standards that are mandatory in the design of building structures, as prescribed by the current Regulation on mechanical resistance and stability of structures. In the second part of the thesis, the seismic analysis and dimensioning of the transverse reinforcement for the selected column of the considered frame and the frame with infills is presented. Since the standard does not prescribe the modelling of the influence of the infills, they have been modelled with equivalent diagonals. The results of analysis show that the value of the vibration period of the structure with infills is only 30% of the value of the vibration period of bare frame. Consequently, the total design base shear in the construction with infills is approximately three times the design base shear of the bare frame for both X and Y direction. Due to greater stiffness of the infilled frame, it turned out that the horizontal displacements as well as the corresponding storey displacements represent only about 15% of the corresponding values in the bare frame, which also took into account the second order effects. The main difference is shown for the design of transverse reinforcement, since the influence of the capacity of the infills should also be taken into account when determining the amount of transverse reinforcement in the column