Calculul podului rulant

1. Schema constructiva

2.Schema statica

P, P, P, P, P, P, P, P= convoi de forte verticale

P, P= convoi de forte transversale

P, P= convoi de forte longitudinale

3.Actiuni

permanente + cvasipemanente(g)

greutate propie pod rulant

greutate sina de rulare

greutate propie prinderi

greutate balustrada

greutate propie grinda de franare

spatiu tehnic

circulatie pasarela

g= 6 kN/ml

n= 1.15

g= n g=1.15*6 = 6.9 kN/ml

variabile = actiuni ale podului rulant

Avem 2 poduri rulante: Q = 10 tf

Q = 20 tf

care lucreaza in grupa a III a de functionare.

Incarcari verticale (P)

P= nP

n= 0.9

P= n n P

n= 1.2

= 1.3

pod rulant Q = 10 tf

P= nP= 0.9*113 = 101.7 kN

P= nP= 0.9*38 = 34.2 kN

P= nP= 0.9*131 = 117.9 kN

P= nP= 0.9*55 = 49.5 kN

P= n nP= 1.2*0.9*1.3*113 = 158.65 kN

P= 1.2*0.9*1.3*38 = 53.35 kN

P= 1.2*0.9*1.3*131 = 183.92 kN

P= 1.2*0.9*1.3*55 = 77.22 kN

Pod rulant Q = 20 tf

P= nP = 0.9*155 = 139.5 kN

P= nP = 0.9*45 = 40.5 kN

P= nP = 0.9*185 = 166.5 kN

P= nP = 0.9*65 = 58.5 kN

P= n nP= 1.2*0.9*1.3*155 = 217.62 kN

P= 1.2*0.9*1.3*45 = 63.18 kN

P= 1.2*0.9*1.3*185 = 259.74 kN

P= 1.2*0.9*1.3*65 = 91.26 kN

Incarcari orizontale transversale (P)

P= nP

n= 0.9

P= n nP

n= 1.3

= 2.2 (10 tf)

= 1.8 (20 tf)

pod rulant Q = 10 tf

P= (Q + G) =(100+30) = 3.25 kN

P= nP= 0.9*3.25 = 2.92 kN

P= n nP= 1.3*0.9*2.2*3.25 = 8.36 kN

pod rulant Q = 20 tf

P= (Q + G) =(200+47) = 6.17 kN

P= n P= 0.9*6.17 = 5.55 kN

P= n nP= 1.3*0.9*1.8*6.17 = 12.99 kN

Incarcari orizontale longitudinale (P)

P= nP

n= 0.9

P= n nP

n= 1.3

= 2.2 (10 tf)

= 1.8 (20 tf)

pod rulant Q = 10 tf

P= P= *131 = 13.1 kN

P= P= 131 kN

P= nP= 0.9*13.1 = 11.79 kN

P= n nP= 1.3*0.9*2.2*13.1 = 33.72 kN

pod rulant Q = 20 tf

P= P= *185 = 18.5 kN

P= P= 185 kN

P= nP= 0.9*18.5 = 16.65 kN

P= n nP= 1.3*0.9*1.8*18.5 = 38.96 kN

4.Eforturi

A = 5300 mm

B = 6450 mm

A'= 5600 mm

B'= 7100 mm

y = = 1325 mm

A + y + A'= 5300 + 1325 + 5600 = 12225 mm > t = 9000 mm

Rezultanta fortelor :

R = P+ P= 217.62 + 259.74 = 477.36 kN

Pozitia lui R :

PA' = Rx

217.62*5600 = 477.36*x x = 2552.94 2553 mm

A'- x = 5600 - 2553 = 3047 mm > x    c = x = 2553 mm

= 0: 477.36*(4500-1276.5)-R*9000 = 0 R= 170.97 kN

R= R - R= 477.36-170.97 = 306.39 kN

M= 306.39*(4500+1276.5)-477.36*2553 = 551.16*10kNmm = 551.16 kNm

M = 64.24 kNm

M= M+ M= 551.16+64.24 = 615.4 kNm

Calculul fortei taietoare

T = 337.44 kN

T= T-6.9*(4.5+1.2765-5.6) = 336.22 kN

T= T- P= 336.22-217.62 = 118.6 kN

T= T-6.9*5.6 = 118.6-6.9*5.6 = 79.96 kN

T= T- P = 79.96-259.74 = - 179.78 kN

T= T-6.9*(4.5-1.2765) = - 202.02 kN

T= T+ R

Momentul dat de fortele orizontale transversale:

= 0: 12.99*0.1765+12.99*(0.1765+5.6)-r*9 = 0 r= 8.59 kN

r= 2 P- r= 2*12.99-8.59 = 17.39 kN

M= 17.39*(0.1765+5.6)-12.99*5.6 = 27.7 kNm

Dimensionarea grinzii de rulare

OL37 R = 220 N/mm

W= = = 3*10mm

propun t= 8 mm

h= 1.15 = 1.15 = 704.22 mm h= 750 mm

= = 93.75 O.K.

A= - 0.16 h t= - 0.16*750*8 = 3040 mm

A= b t

propun t 2.5) t 20 mm t= 12 mm

b = = = 253.33 mm b = 260 mm

aleg KP 80

b= 95 mm

b= 41 mm

b= 2(b+ b) + 2 (2530) = 2*(95+41)+2*29 = 330 mm

b b aleg b = 330 mm

= = 13.41 < 15 O.K.

Verificarea rezistentei grinzii

P + g M

= z R

I= + 2bt()+ 2 =

= + 2*330*12*()+2*= 0.143*10 mm

= * 387 = 166.42167 N/mm < R = 220 N/mm O.K.

= R= 0.6 R

T= max (T, T) = max (79.96; 179.78) = 179.78 kN

= = 29.96 N/mm < R= 0.6*220 = 132 N/mm O.K.

= 1.1 R

= = = = 161.25 N/mm

= = 169.39 N/mm < 1.1 R = 1.1*220 = 242 N/mm O.K.

= P R

P= max ( P, P) = 259.74 kN

x = 50+2(h+ t) = 50+2(130+12) = 334 mm

= 259.74*10*= 97.298 N/mm < 220 N/mm O.K.

P M

H = = = 19.78 kN

d = 1400 mm

= = R

= = 4.99 5 N/mm < 220 N/mm O.K.

P

= = R

= = 9.8310 N/mm < 220 N/mm O.K.

= (M) + + R

= 167+5+10 = 183 N/mm < 220 N/mm O.K.