The subject of this paper is the result of the analysis of a multistorey reinforced concrete frame, using nonlinear static "pushhover" analysis. The analysis was performed on a structure calculated according to the current regulations for the design of earthquake resistant structures. The results were obtained using two software suites Radimpex Tower and Abaqus. Curves of the nonlinear response of the structure were formed in order to compare the results obtained by applying these two software suites.
This paper covers the reconstruction of the chimney at the heating plant Visnjickabanja (municipality of Palilula, Belgrade) and restoration and reconstruction of the existing foundation of the chimney. The need for reconstruction emerged due to change of the raw material, i.e. the transition from fluid fuel (mazut) to natural gas. The existing chimney is self-contained, standing circular steel structure with external diameter of 1500mm, standing on the two-stepped foundation made of reinforced concrete. With the change of raw material there was the need for three separate chimney pipes, and because of that on demand of the investor, the project of supporting carrier with triangular cross section, with sides of length 3.0 m, was made. With the analysis of the existing foundation structure and based on the existing geotechnical elaborate, it was concluded that the foundation needs to be restored and repaired in terms of reinforcement and expansion.
Prilikom dijagnostike stanja armirano betonske konstrukcije sa aspekta ocene trajnosti betona postojeće metode uglavnom koriste rezultate ispitivanja dobijene sofisticiranom i skupocenom opremom, koji nisu univerzalnog karaktera, tj. mogu se koristiti samo za jedan segment ocene trajnosti betona. Na taj način svaka dodatna informacija o stanju betona je dragocena, pogotovo ako ne zahteva dodatno ispitivanja sa posebom opremom. Ispitivanja betonskih i AB konstrukcija vađenjem mikrojezgara se smatra poludestruktivnom metodom, koja neznatno oštećuje samu konstrukciju, a koristi se prvenstveno za ispitivanje karbonatizacije, zapreminske mase i upijanja betona. U radu su predstavljeni rezultati ispitivanja kapilarnom upijanja prema SRPS EN 480-5 na standardnim uzorcima i na mikrojezgrima izvađenim iz uzoraka oblika kocke sa dužinama ivica 20 cm. Takođe su predstavljeni i rezultati ispitivanja penetracije vode pod pritiskom na istim uzorcima, na kojima su prethodno uzorkovana mikrojezgra. Ova ispitivanja su urađena na betonima sa zahtevanom projektovanom mešavinom za najzahtevnije klase izloženosti prema EN 206-1 i koristeći razne dodatke koji je poznato da utiču strukturu pora i samim tim i na trajnost očvrslog betona.
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