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Tehnica mecanica

Tehnica mecanica


Index » inginerie » Tehnica mecanica
Calulul panei


Calulul panei


Calulul panei

=3375 mm

alegem =2700 mm < 3100 mm



=2250 mm

tg

tg y = 2025 mm

tg (30 O.K.

tg = 0.05 cos = 0.99 1 ; sin= 0.049 0.05

Incarcari

Valori normate

n

Valori de calcul

P

invelitoare

pana

0.50/ cos = 0.50

0.10/ cos = 0.10

Q

spatiu tehnic

praf industrial

V

zapada p

p= p = 0.72

=1.01

= 1.42

p= p = 1.02

p= c c q = 1*0.8*0.9 = 0.72 kN/m

=- 0.2 = 1.4-0.2 = 1.01 > 0.3= 0.3*1.4 = 0.42 O.K.

g= 0.5+0.1+0.3+0.5 = 1.4 kN/m

= - 0.4= 2.2-0.4 = 1.42 > 0.3= 0.3*2.2 = 0.66 O.K.

Combinatii de actiuni:

S.L.U.

p= + n = + + np=

= (0.60+0.11)+(0.36+0.70)+1*1.02=2.79 kN/m

S.L.E.N.

p= + + n = + + n p =

= (0.5+0.1)+(0.3+0.5)+1*0.72 = 2.12 kN/m

Incarcari pe ml de pana :

q= p d = 2.79*2.7 = 7.53 kN/ml

q= pd = 2.12*2.7 = 5.72 kN/ml

q= q cos = 7.53*1 = 7.53 kN/ml

suportate de pana

q= qcos = 5.72*1 = 5.72 kN/ml

q = qsin= 7.53*0.05 = 0.37 kN/ml

suportate de contravantuiri

q= qsin= 5.72*0.05 = 0.28 kN/ml

Eforturi

M= k qt = 47.57 kNm

M= 0.105*7.53*9= 64.04 kNm

M= 0.033*7.53*9= 20.12 kNm

M= 0.079*7.53*9= 48.18 kNm

M = 28.05 kNm

M= k qt = 36.13 kNm

M= 0.105*5.72*9= 48.64 kNm

M= 0.033*5.72*9= 15.28 kNm

M= 0.079*5.72*9= 36.60 kNm

M = 21.31 kNm

T= k qt = 0.039*7.53*9 = 2.64 kN

T= 0.605*7.53*9 = 41 kN

T= 0.526*7.53*9 = 35.64 kN

T= 0.477*7.53*9 = 32.32 kN

T= 0.5*7.53*9 = 33.88 kN

Dimensionare pana

t16 mm R=220 N/mm (OL 37)

sectiunile 4 si 20

W= = = 219000 mm

propun t= 4 mm

h= 1.15 = 1.15 = 269.085 mm < 300 mm

aleg h= 280 mm

70 < 100

= = 70 O.K.

A= - 0.16 ht= - 0.16*280*4 = 602.94 mm



t= (1.52.5) t t= 1.5 t= 1.5*4 = 6 mm

b = = = 100.49 b = 110 mm

b' = = = 53 mm

= = 8.83 < 15 O.K.

sectiunea 10

1. W= = = 291090.9 mm

A= - 0.16 ht= - 0.16*280*4 = 860.41 mm

t= 6 mm

b = = = 143.4 b = 150 mm

b' = = = 73 mm

= = 12.16 < 15 O.K.

sectiunile 15 si 25

1. W= = = 127500 mm

A= - 0.16 ht= - 0.16*280*4 = 276.15 mm

t= 6 mm

b = = = 46.02 mm b = 100 mm

b' = = = 48 mm

= = 8 < 15 O.K.

Verificare de rezistenta (S.L.U.)

Campurile 4, 15, 25

Sectiunea 4

= z

z= + t= + 6 = 146 mm

I= 2 + =

= 2 + = 34.31*10 mm

= *146 = 202.42 203 N/mm < R = 220 N/mm O.K.

Sectiunea 15

= z

z= + t= + 6 = 146 mm

I= 2 + =

= 2 + = 31.85*10 mm

= *146 = 92.22 93 N/mm < R = 220 N/mm O.K.

Sectiunea 25

I= I= 31.85*10 mm

= z= *146 = 128.58 129 N/mm < R = 220 N/mm

Reazemul 10 si 20

Sectiunea 10

I= 2 + =

= 2 + = 44.13*10 mm

= z= *146 = 211.87 212 N/mm < R = 220 N/mm

= = = 36.6 37 N/mm < R= 0.6R = 132 N/mm

= = = 213.83 214 N/mm <

< 1.1R = 242 N/mm

= z= *140 = 203.16 204 N/mm

z= = = 140 mm

Sectiunea 20

I= I= 34.31*10 mm

= z= *146 = 205.02 206 N/mm < R = 220 N/mm

= = = 30.25 31 N/mm < R= 0.6R = 132 N/mm

= = = 204.18 205 N/mm <

< 1.1R = 242 N/mm

= z= *140 = 196.59 197 N/mm

Verificarea la sageata (S.L.E.N.)

f f

= 6.78 cm = 7.3 cm

M = 57.91 kNm    M = 57.91 kNm

f f

= = 3.41 cm    = = 5.53 cm

f= f- f= 6.78 - 3.41 = 3.37 cm <    f= f- f

< f = 4.5 cm O.K. = 1.77 cm < f= 4.5 cm O.K

Din motive constructive, pentru evitarea sudurii intre talpile de 110 mm si cele de 100 mm, vom dimensiona talpile de 100 mm la 110 mm.

Astfel,dimensiunile panelor sunt :

Sectiunile 4, 20,15,25 : inimi 4 280 mm

talpi 6 110 mm

Sectiunea10 : inima 4 280 mm

talpi 6 150 mm







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