Page 5 - Solai alleggeriti in calcestruzzo armato soggetti ad azioni gravitazionali e sismiche

Indice
Prefazione .......................................................................................................... pag. 9 Premessa ............................................................................................................ » 11
1. Descrizione della tipologia strutturale ...................................................... » 13 1.1. Piastre alleggerite: inquadramento generale ............................................ » 13 1.2. Il sistema costruttivo del solaio a piastra alleggerita
nel suo sviluppo storico ........................................................................... » 16 1.2.1. Le origini ...................................................................................... » 17 1.2.2. La necessità dell’alleggerire ........................................................ » 19 1.2.3. Verso il paradigma della soletta alleggerita ................................. » 21
1.3. Descrizione del sistema costruttivo ......................................................... » 27 1.4. Modellazione: teorie strutturali ................................................................ » 32 1.4.1. Piastra di Kirchhoff ...................................................................... » 32
1.4.1.1. 1.4.1.2. 1.4.1.3. 1.4.1.4. 1.4.1.5.
Ipotesi di calcolo ........................................................... » 32 Modello cinematico ....................................................... » 32 Legame costitutivo ........................................................ » 34 Equilibrio ...................................................................... » 36 Condizioni al contorno .................................................. » 38
1.4.2. Modellazione discreta di un impalcato cellulare ......................... » 39
1.4.3. Modellazione numerica ................................................................ » 43
1.4.4. Esempio di calcolo: piastra quadrata appoggiata lungo i quattro
lati e soggetta ad un carico uniformemente distribuito ................ » 45
1.4.4.1.
1.4.4.2.
1.4.4.3.
progettuali e inquadramento normativo ....................................... » 53
Descrizione del problema .............................................. » 46 Soluzione analitica ........................................................ » 46 Modelli numerici ........................................................... » 48
1.5. Criteri
1.5.1. Meccanismo resistente per piastre alleggerite ............................. » 53
1.5.2. Calcolo dell’armatura ................................................................... » 54
1.5.3. Criteri normativi............................................................................ » 56
1.6. Bibliografia .............................................................................................. » 58
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