51pred 5 2012 stepenista i podvlake
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Stepeništa
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Armiranje stepenišnog kraka
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GREDE – PODVLAKE KRSTATSO ARM. PLOČA I PLOČA U JEDNOM PRAVCU
Statički sistemi kod samostalnih ploča
l
d=l/8-l/10 d=l/10-l/12
Kod kontinualnih krstatsto armiranih ploča
d=l/10-l/12
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Kod ramovskih konstrukcija treba uzeti efekat uklještenja kod ivičnog stuba
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Za relativno malo povremeno opterećenje p u odnosu na stalno g statički uticajiSe određuju za opterećenje raspodeljeno po svim rasponima
g
p
Za slučaj da je p>>g treba određivati ekstremne uticaje
p p
p pp
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Poprečni preseci podvlaka
¸Armiranje podvlaka
Minimalni procenat armiranja GA 0,25%, RA 0,20%
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Proračun statičkih uticaja
Na proračun statičkih uticaja kod statički neodređenih nosača generalnio utiče promena krutosti po dužini nosača.Proračun se može sprovesti na sledeće načine :1. po ¨linearnij teoriji¨, ili ¨teoriji elastičnosti¨,2. po ¨linearnoj teoriji sa ograničenom preraspodelom¨,3. po ¨nelinearnoj teoriji¨,4. po ¨teroji plastičnosti¨.
Linearna teorija – krutost neisprskalog preseka, samo betonski presek. Pitanje određivanja uticaja od graničnog opterećenja na osnovu elastičnog ponašanja konstrukcije.Moguće stanje statičkih sila, jednostavan proračun, odgovara stanju eksploatacije.
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1/ry 1/ru
1/r
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Teorija elastičnosti sa ograničenom preraspodelom
• Izborom armature u presecima moze se uticati, pri graničnim opterećenjima na realno ostvarenu raspodelu statičkih uticaja u statički neodređenim sistemima. Ovo se postiže izborom procenata armiranja pritisnutom i zategnutom armaturom
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Ramovske konstrukcije
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