UVODKonstrukcije napravljene spajanjem ravnih ploča na njihovim podužnim krajevima veoma su česte. Važan podskup tih konstrukcija koje su glavni predmet ovog rada u suštini jesu prizmatične forme, ali one mogu imati i poprečna ukrućenja koja se koriste u sandučastim nosačima, ukrućenim pločama i pločastim nosačima. Opterećenje je uglavnom takvo da su najveći naponi u pravcu dužine, na primer, aksijalno opterećenje ili uzdužno savijanje.Analiza ponašanja pločastih konstrukcija odvijala se na nekoliko različitih načina. Jedan od načina bio je sprovođenje sveobuhvatnog istraživanja jednog tipa pločastih konstrukcija, kao što je sandučasti stub, tako da se testira cela familija modela u laboratoriji [1]. Drugi načini bili su numerički, primenom metoda konačnih elemenata (MKE) koji mogu uključiti komplikovane geometrije konstrukcija [2]. Cilj ovog rada jeste da istraži lom grede s početnim imperfekcijama, pojednostavljenim modelima koji se koriste u mehanici, radi poređenja dobijenih rezultata.Iako je korištenje MKE trenutno dominantno u analizi pločastih konstrukcija, nije tako jednostavno postaviti problem. Za tačnost je poželjno da se koriste manji elementi u zonama gde se čelik izvija lokalno i postaje plastičan, ali nije uvek poznato unapred gde te zone treba de se pojave. Takođe, u analizi ponašanja pločastih konstrukcija može se primeniti i metod konač-nih traka (MKT). MKT se zasniva na svojstvenim funkcijama koje su izvedene iz rešenja diferencijalne jednačine Profesor dr Dragan D. Milašinović, dipl. inž. građ.,
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.
The paper presents conducted rehabilitations on two bridges over the Paklešnice River, as well as the rehabilitation of the bridge over the Kravaričkog Brook at the Forestry House in Gornji Lajkovac Municipality of Mionica. Prior to the conducting control structural analysis of bridges and testing the quality of installed materials: concrete and reinforcement, detailed recording of all necessary dimensions of existing bridges was performed. On the basis of the performed measurements and conducted structural analysis of the obtained results for the relevant influences, the necessary remediation measures have been carried out.
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