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Raccolta esercizi sugli sforzi

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Meccanica Razionale Esempi di esercizi sul calcolo degli sforzi nei sistemi articolati Nel punto generico dell’asta indicata con un tratteggio calcolare (in funzione di s): (1) sforzo assiale N; (2) sforzo di taglio T; (3) momento flettente Γ. Utilizzare l’ascissa s indicata in ciascun disegno e le convenzioni illustrate qui sotto. Si intendono di peso trascurabile le aste per le quali questo non è indicato. N N T T /c128/c128 Esercizio 1 l, p sA B incastro [N= 0; T=−p+ps/l; Γ=−pl/2+ps−ps2/2l] Esercizio 2 l,p s A B π/4 [N= √ 2p/2− √ 2ps/2l; T=− √ 2p/2+ √ 2ps/2l; Γ=− √ 2pl/4+ √ 2ps/2− √ 2ps2/4l] Esercizio 3 2l, p l s C D A B l √ 2 [N= √ 2p/2− √ 2ps/4l] [(0≤s<l) : T= √ 2ps/4l; Γ=− √ 2ps2/8l] [(l<s ≤ 2l): T=− √ 2p/2+ √ 2ps/4l; Γ=− √ 2pl/2+ √ 2ps/2− √ 2ps2/8l] 1 Esercizio 4 2l, p l l, p sA B C D [N= 0; T=− 3p/2+ps/2l; Γ=− 2pl+ 3ps/2−ps2/4l] Esercizio 5 l, p l √ 2 s l A B C [N=p/2; T=−p/2+ps/l; Γ=ps/2−ps2/2l] Esercizio 6 l, p l √ 2, p s l A B C [N=−p/2; T=− 2p+ps/l; Γ=− 3pl/2+ 2ps−ps2/2l] Esercizio 7 2l, p l √ 2 s l A B C D [(0≤s<l) : N=p; T=ps/2l; Γ=−ps2/4l] [(l<s ≤ 2l): N= 0; T=−p+ps/2l; Γ=−pl+ps−ps2/4l] Esercizio 8 2l, p l √ 2 s l A B C D [(0≤s<l) : N=−p; T=ps/2l; Γ=−ps2/4l] [(l<s ≤ 2l): N= 0; T=−p+ps/2l; Γ=−pl+ps−ps2/4l] 2 Esercizio 9 l, p l l s l √ 2 A B C D l √ 2 [N=− √ 2p/2+ √ 2ps/2l; T=− √ 2p/4+ √ 2ps/2l; Γ= √ 2ps/4− √ 2ps2/4l] Esercizio 10 l, p l l s l √ 2 A B C D l √ 2 [N=− √ 2ps/2l; T=− √ 2p/4+ √ 2ps/2l; Γ= √ 2ps/4− √ 2ps2/4l] Esercizio 11 l,p l √ 2,p s π/4 A B C [N=− 5p √ 2/4+ps/2l;T=p √ 2/4−ps/2l; Γ=−ps2/4l+ps √ 2/4] Esercizio 12 l, p l, p l √ 2, p s l A B C D incastro [N= 0;T=− 5p/2+ps/l; Γ=− 2pl+ 5ps/2−ps2/2l] Esercizio 13 l, p l, p s l √ 2 l √ 2/2 A B C H K [(0≤s≤l/2):N=−p √ 2/2−ps √ 2/2l;T=ps √ 2/2l−p √ 2/2; Γ=−ps2√ 2/4l+ps √ 2/2] [(l/2≤s≤l):N=−ps √…

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