beton prezentacija 2
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Beton PredavanjaTRANSCRIPT
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Greda izložena kombinaciji djelovanja momenta savijanja i poprečne sile
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Rešetkasti model prenosa opterećenja kroz gredu
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Određivanje sila u štapovima rešetkastog modela
Štapovi dikretiziranog rešetkastog modela kao rezultante polja naprezanja
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«Razmazani» rešetkasti model
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Polje naprezanja na pritisak u rebru
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Nosivost uzengija
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Uzdužna armatura kao armatura protiv»cijepanja» betona
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Uvođenje koncentrične sile
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Smanjenje presječnih sila u zoni oslonaca
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Lom u zoni ankerisanja
Potrebna dužina ankerisanja na krajnjem osloncu Rješenje za grede male visine
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Ankerisanje pomoću horizontalnih ukosnica
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Nosivi sistem «Luk sa zategom
Efekat «uklinjavanja» pukotine podužnom armaturom
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Gredni element izložen konstantnoj poprečnoj sili
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Bezdimenzionalne sile smicanja između pojasa i rebra (presjek A-A) i pojasnice (flanše) i rebra (presjek B-B)
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Jednoosna kombinacija djelovanja: savijanje, poprečna sila i normalna sila
Zamišljeni model: Unos sile preko fiktivne poprečne grede
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Normalna sila zatezanja
Normalna sila pritiska
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Svođenje presječnih sila u težište zategnute armature
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Presječne sile torziono napregnute grede
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Položaji težišne tačke smicanja M u odnosu na težište presjeka S
Torzija cilindričnog štapa – trajektorije glavnih naprezanja
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Tok naprezanja na torziju pravougaonog i šupljeg poprečnog presjeka
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Torzioni moment inercije torzioni moment
otpornosti poprečnih presjeka
prema teoriji elastičnost
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Prandtl-ova analogija sa mjehurom sapunice za elastične materijale
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Ravnotežna torzija i torzija kompatibilnosti
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Torziona krutost pravougaonih poprečnih presjeka različitih odnosa stranica
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Rešetkasti model
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Model smičuće stijenke
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Rešetkasti model za čistu torziju sa torzionom armaturom od podužnih šipki i uzengija (nagib pritisnute dijagonale 45stepeni)[
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Rešetkasti model za čistu torziju sa torzionom armaturom od podužnih šipki i uzengija (proizvoljan nagib pritisnute dijagonale
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Model ispucalog punog poprečnog presjeka pod dejstvom torzije
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Torziona armatura
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Moment deformacije prema teoriji 2.reda
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Objašnjenje mehanizma nosivosti štapnog elementa opterećenog na savijanje sa podužnom silom
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Centrični pritisak
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Savijanje sa uzdužnom silom pritiska
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Savijanje sa uzdužnom silom pritiska-srednji ekscentricitet
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Savijanje sa uzdužnom silom pritiska-veliki ekscentricitet
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Savijanje sa uzdužnom silom zatezanja-veliki ekscentricitet
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Savijanje sa uzdužnom silom zatezanja-mali ekscentricitet
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Poprečni presjek, deformacija i naprezanje betona
Jedinični poprečni presjek u naponskom stanju I
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Jedinični poprečni presjek u naponskom stanju II (c2(-)cp(-))
Jedinični poprečni presjek u naponskom stanju II (c2(-)cp(-))
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Poprečni presjek armature, dilatacija armature
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Model stuba sa obostrano zglobnim osloncima i ekvivalentni konzolni stub
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Teorija 2.reda kod linearnog ponašanja materijala
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Centrično pritisnut štap N<NE
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Centrično pritisnut štap Euler-ovom silom (silom izvijanja) N=NE
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Slučaj nestabilnosti N>NE
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Nelinearno ponašanje materijala (armirani beton): Teorija 2.reda
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Nelinearno ponašanje materijala (slučaj nestabilnosti)
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Određivanje kritičnog opterećenja pomoću M/ dijagrama u mjerodavnom poprečnom presjeku