. III 5,6 . 2,4 . . 3.1. q = 2,0 /2. - , - .
:
g1 = 18,9 /3; gII = 18 /3;
j1 = 22; jII = 25;
1 = 8 ; II = 12 .
:
g¢1 = 18 /3; g¢II = 17 /3;
j¢1 = 26; j¢II = 29;
¢1 = 0; ¢II = 0.
1-1. 1 .
. e d = j¢1.
tg e = 2,4/8 = 0,3; e = 17.
= h = 8 (1)
g = [g¢1g f hl - c ¢1(k1 + k2)] y/h = [18×1,15×8×0,502 - 0] 8/8= 83,13 .
(9)
q = qg f l = 20×1,2×0,502 = 12,05 .
. 3 . 1 d = j¢1 = 26 l = 0,502.
Fsa (12), (13), (14) b = h:
Fsa,g = Pgh /2 = 83,13×8/2 = 332,52 ;
Fsa,q = Pqyb = 12,05×8 = 96,4 ;
Fsa = Fsa,g + Fsa,q = 332,52 + 96,4 = 428,92 .
b.
. 3.1.
1 (b1 = 0)
(16)
Fv = Fsa tg(e + d) + G + g1 tgb b2 /2 = 428,92 tg(17+26)+ 731,32 + 0 = 1131,3 .
0,9 . 2.2 (G = 731,32 ).
r (17)
hr = d = 2,4 , lr = 1; 1 = 5 ; g1 = 18,9 /3;
Er = g1 lr /2 + c1hr (lr - 1)/tg j1 = 18,9×2,42×1/2 + 5×2,4(1 -1)tg 22 = 54,43.
Fsr (15) 1 = 5 (. .3 1.2):
Fsr = Fv tg(j - b) + bc1 + Er = 1131,3 tg (22 - 0) + 6,4×5+54,43 = 543,5.
(11):
Fsa = 428,92 < 0,9×543,5/1,1 = 444,68 .
.
2 (b2 = jI/2 = 11)
lr = tg2 (45+jI/2) = 2,19;
Fv = 428,92 tg(17+26)+731,32 + 18,9 tg 11×6,42/2 = 1206,53 .
Er :
hr = d + b tgb = 2,4 + 6,4tg 11 = 3,64 ;
|
|
Er = 18,9×3,642×2,19/2 + 8×3,64(2,19 - 1)/tg 22 = 359,98 ;
Fsr = 1206,53 tg(22 - 11) + 6,4×8 + 359,98 = 645,7 .
(11):
Fsa = 428,92 <0,9×645,7/1,1 = 528,3 .
.
3 (b3 = jI = 22)
Fv = 428,92 tg(17+ 26) + 731,32 + 18,9 tg22×6,42/2 = 1287,68 ;
hr = 2,4 + 6,4 tg22 = 6,2 ;
Er = 18,9×6,22×2,19/2 + 8×6,2(2,19 - 1)/tg22 = 941,62 ;
Fsr = 1287,68 tg(22-22) + 6,4×8 + 941,62 = 992,82 ;
Fsa = 428,92 <0,9×992,82/1,1 = 812,3 .
(11) , .
(22)
tg dI = Fsa / Fv = 428,92/1131,32 = 0,376 > sin jI = 0,375,
, .
(27) ( I )
h * = [ Fsa,gh /3 + Fsa,q (h - ya - yb /2)]/ Fsa =
= [332,52×8/3 + 96,4(8 - 0 - 8/2)]/ 428,92 = 2,97 .
:
S i = 31,75 ×.
(26):
0 = Fsa [ h * - tg(e + d)(b /2 - h *tge)] + S i = 428,92 [2,97 -
- tg (17 + 26)(6,4/2 2,97 tg17)] + 31,75 = 388,9 ×;
= 0/ Fv = 388,9/1131,3 = 0,344 < b /3 = 6,4/3 = 2,13 .
: b ¢ = h - 2 e = 8 - 2×0,344 = 7,31 .
Nu, , (23)
Nu = b ¢ (Ngb ¢gI + Nq g¢I d + Nc cI) = 7,31 (0,58×7,31×18,9 + 3,14×18×2,4 + 5,31×8) = 1887,9 .
d .
(21)
1131,3 < 0,9×1887,9/1,1 = 1544,6
(21) , .