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Imbinare stalp grinda
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CALCUL IMBINARE STALP- GRINDA
Materiale: OTEL OL37Rc= 210 N/mm2 Rand hcum
i hreli
t1= 16 mm 8 0t2= 20 mm 7 0 0
Caracteristici buloane: 6 0 0M20 5 420 1308.8 4 290 90
Ab= 314 mm2 3 200 110Anb= 245 mm2 2 90 90Rc
b= 512 N/mm2 1 0 0Ri
b= 410 N/mm2
Rfb= 307 N/mm2
Rpgb= 340 N/mm2
Rezistenta forfecare bulon
= 71 kN
= 134 kN
= 70 kNm
Grosime talpa stalpGrosime placa capat grinda
Rezistenta de calcul bulonRezistenta intindere bulon
Rezistenta presiune bulon
Rezistenta de calcul otel
Buloane
Arie bruta bulonArie neta bulon
Grupa Bulon
d2 d1
d 2d 1
t 1 t2
T
N
M
Dispunere buloane: Eforturi sectionale in surubul cel mai solicitat:nv= 3 Nno= 1 nt
nt= 3 Tnf= 1 nt
Distante buloane:dmin1= 40 mmdmax1= 80 mmdmin2= 60 mm Eforturi sectionale capabile:dmax2= 160 mm Ncap
i= AnbxRib
Eforturi imbinare: Ncapf= nfxAbxRf
b
N= 134 kN Ncappg= dxΣtixRpg
b
T= 71 kNM= 70 kNm Eforturi unitare in surubul cel mai solicitat:
NbmaxM
Verificari: Ab
NbT
NbmaxM+Nb
N< Ncapi < Ab
NbT< min(Ncap
pg,Ncapf) < σech= σM
2+3xτ2
i= 200.1 N/mm223.7 kN 96.5 kN OK
= 151.7 N/mm2
τ=
Ef. cap. la pres. pe gaura = 108.8 kN
= 47.6 kN
92.3 kN 100.4 kN OK
Efort capabil intindere = 100.4 kNEfort capabil forfecare = 96.5 kN
Efort in bulon din taietoare NbT=
= 75.4 N/mm2
Efort in bulon din moment NbmaxM=
M x hmax
Σhi2
σM=
Moment incovoiere grinda
Numar randuri buloaneNumar coloane buloane
Numar sectiuni forfecareNumar total buloane
Axiala pe grindaTaietoare pe grinda
Efort in bulon din axiala
Dist. maxima intre buloane
Distanta minima margineDistanta maxima margineDist. minima intre buloane
NbN= = 44.7 kN
= 23.7 kN