Primjer - Zadatak - Spregnute k.
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Transcript of Primjer - Zadatak - Spregnute k.
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III. Spregnuti nosači
3.4.3. Vibracije
Dinamičke karakteristike međukatnih konstrukcija moraju zadovoljiti zahtjeve koji vrijede općenito za sve
konstrukcije a navedene su u Eurokodu 0 , dok se vlastita frekvencija nosača f može odrediti u skladu s
Eurokodom 3.
3.5. NUMERIČKI PRIMJER
Zadatak:
Potrebno je dimenzionirati spregnuti nosač oslonjen na dva ležaja s rasponom od L = 12 metara i međusobnim
razmakom nosača od b=3 metra (slika 25.). Nosač u vrijeme betoniranja ploče nije poduprt. Čelični nosač je
izveden sa početnom zakrivljenošću u svrhu nadvišenja tako da nadvišenje u polovici raspona iznosi 45 mm.
Zadano je sljedeće:
Kvaliteta materijala:
• čelik S 355
• beton C 25/30
• čvrstoća čelika za moždanike fu=450 N/mm2
Djelovanja:
• dodatno stalno opterećenje gk'=1,0 kN/m2
• korisno opterećenje pk=2,5 kN/m2
• pregradni zidovi pk'=0,75 kN/m2
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III. Spregnuti nosači
Slika 25.
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III. Spregnuti nosači
Slika 26.
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III. Spregnuti nosači
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III. Spregnuti nosači
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Slika 25.
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III. Spregnuti nosači
izraz (4)
izraz (3)
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III. Spregnuti nosači
izraz (10)
izraz (9)
izraz (7)
Slika 27.
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izraz (11)
izraz (12)
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III. Spregnuti nosači
izraz (23)
izraz (26)
izraz (27)
izraz (29)
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Slika 28.
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