R (39):
g1 = 1,3; g2 = 11 ( . 6); k = 1,1; g = 0,78; q = 4,11;
= 6,67 ( . 7 j II = 25); d = 1,2 .
l = 0,33 ( e = 21; d = j¢II= 29 . 3 . 2).
g = (17×1×4,2-0)0,33×4,2/4,2 = 23,56 ;
q = 5×1×0,33 = 1,65 ; Fsa,g = 23,56×4,2/2 = 49,48 ; Fsa,q = 1,65×4,2 = 6,93 ;
Fsa = Fsa,g + Fsa,q = 49,48 + 6,93 = 56,41 .
(33)
h * = [ Fsa,gh /3 + Fsa,q (h - ya - yb /2)]/ Fsa = [49,48×4,2/3 + 6,93(4,2 - 0
- 4,2/2)]56,41 = 1,49 .
:
S i = 24,3 ×.
(31):
0 = Fsa [ h * - tg(e + d)(b /2 - h *tge)] + S i = 56,41[1,49 - tg (21 + 29)(2,4/2 - 1,49 tg21)] + +24,3 = 66,13 ×;
Fv = 56,41 tg(21 + 29) + 85,3 + 0 =152,53 , = 0/ Fv = 66,13/152,53 = 0,43 > b /6 = 2,4/6 = 0,4 .
max= 2 Fv /3 c0 = 2×152,53/3×0,77 = 132,06 ;
0 = 0,5 b - e = 0,5×2,4 - 0,43 = 0,77 .
I-I ( = 3) (40):
Ni = S Fvi = (0,5×1,2 + 1×1,8)20×1,1 + 1,2×0,5×18×1,15 + 5×1,2×0,5 = 68,22 ;
Qi = S Fsa,i = 2,28×3 + 33,04×32/4,2×2 = 42,24 ;
i = S Fvixi + S Fsa,iyi = 1,52 + 45,66 = 47,18 ×,
S Fvixi = 0,5×1,2×20×1,1×0,25 - 0,5×1,2×0,5×18×1,15×0,5/3 - 5×0,5 ´ 1,2×0,25 = 1,52 ×; S Fsa,iyi = =2,28×3×3/2 +
33,04×32×1/4,2×2 = 45,66 ×.
2.
. = 4,5 , d = 1,5 . q = 25 . . 2.
( ) : g n= 17 /3,
j n= 32, c n= 0. = 2×104
.
, .
:
g I= 1,05×17 = 18 /3; g II= 17 /3;
j I = 32/1,1 = 29; j II= 32;
I= 0; II= 0.
:
g ¢I = 0,95×18 = 17 /3; g ¢II = 0,95×17 = 16
/3;
j ¢I = 0,9×29 = 26; j ¢II = 0,9×32 = 29;
|
|
|
¢I = 0; II = 0.
.
tg e = 3,3/6 = 0,55;e = 2848¢ 29;
. 3 . 2 d = j ¢I= 26 l = 0,39.
= h = 6 (1):
g = [g¢Ig fh l - c ¢I(k1 + k2)] y / h = [17×1,15×6×0,39 - 0] 6/6 = 45,75
.
(3):
q = q g f l = 25×1,2×0,39 = 11,7 .
. 2.
Fsa (16)-(18) yb
= h = 6 :
Fsa,g = P g h /2 = 45,75×6/2 = 137,25 ;
Fsa,q = Pqyb = 11,7×6 = 70,2 ;
Fsa = Fsa,g + Fsa,q = 137,25 + 70,2 = 207,45 .
b.
1 (b 1 = 0)
(21):
Fv = Fsa tg(e + j ¢I) + g¢Ig f [ h (b - t)/2 + td ] + gI tg bb 2/2 =
= 207,45 tg(29+26) +17×1,2[6(3,9 - 0,6)/2 + 0,6×1,5] +
+ 18 tg 0×3,92/2 = 514,4 .
Er (22) hr = d = 1,5; gI= 18 /3; lr = 1; c 1 = 0
Fr = gI
l r /2 + c1hr (l r - 1)/tg j I = 18×1,52×1/2 + 0 = 20,25 . Fsr (19):
Fsr = Fv tg(j I - b) + bc1 + Er = 514,4 tg(29 - 0) + 0 +
+20,25 = 303,17 .
(15).
Fsa = 207,45 <1×303,17/1,1 = 275,61 .
.
2 (b 2 = j I/2 = 1430¢)
lr = tg2(45+ j I/2) = tg2(45+29/2) = 2,86;
Fv = 207,45 tg(29+26) + 17×1,2[6(3,9 - 0,6)/2 + 0,6×1,5] +
+ 18 tg 1430¢×3,92/2 = 549,55 .
Er hr = d + b
tgb = 1,5 + 3,9 tg1430¢ = 2,5 :
Er = 18×2,52×2,86/2 + 0 = 160,88 ;
Esr = 549,55 tg (29 - 1430¢) + 0 + 160,88 = 302 ;
Fsa = 207,45 <1×302/1,1 = 274,55 .
.
3 (b3 = j I= 29)
Fv = 207,45 tg(29+26) + 17×1,2[6(3,9 - 0,6)/2 + 0,6×1,5] +
+ 18 tg29×3,92/2 = 589,66 ;
hr = d + b tg b =1,5 + 3,9 tg29 = 3,64 ;
Er = 18×3,642×2,86/2 + 0 = 341,04 ;
Fsa = 207,45 <1×341,04/1,1 = 310,04 .
(15) , .
. 6.9:
tg d 1 = Fsa / Fv = 207,45/514,4 = 0,403; tg d 1 = 0,403 <sinjI= 0,4848; d I= 22.
.
(33)
h * = [ Fsa,g h /3 + Fsa,q (h - ya - yb /2)]/ Fsa = [137,25×6/3 +
+ 70,2(6 - 0 - 6/2)]/207,45 = 2,34 .
|
|
|
, , (32)
0 = Fsa [ h *- tg(e + j ¢I)(b /2 - h *tge)] + g¢Ig f (b - t)[ h (b - 4 t) +
+6 dt ]/12 = 207,45[2,34 - tg(29+26)(3,9/2 - 2,34 tg 29)] +
+ 17×1,2(3,9 - 0,6)[6(3,9 - 4×0,6) + 6×1,5×0,6]/12 = 371,11 ×.
= 0 / Fv = 371,11/514,4 = 0,72 .
b ¢ = b - 2 e = 3,9 - 2×0,72 = 2,46 .
. 5 j I = 29; d1 = 22; Ng = 1,73; Nq = 6,27.
(28)
Nu = b ¢(N g b ¢gI + Nq g¢I d + Ncc I) = 2,46(1,73×2,46×18 + 6,27×17×1,5 + 0) = 581,78 ;
Fv = 514,4 <1×581,78/1,1 = 528,89 .
