1 ¾ ; 2 ; 3 ¾
. . 3.113a , . . b = h = 360 , ho = 330 (. . 81).
. 3.57.
:
Aef = 360 × 200 = 72 000 2 (. . 81);
nx = 5; lx = 170 ; y = 3; ly = 360 ; Asx = Asy = 50,3 2 (Æ8);
Rbc,red gbc = 0,9 (. . 3.113 ) :
Rbc,red = gbc (Rbc + jmRs,) =
= 0,9(15,5 + 2,0 × 0,0193 × 355) = 26,3 .
Aef = 360 × 80 = 28 800 2 (. . 81);
Asx = Asy = 50,3 2 (Æ8); lx = 65 ; ly = 360 ;
Rbs,red gbs = 0,8 :
Rbs,red = gbs (Rbs + jmRs,) =
= 0,8(10,5 + 1,47 × 0,026 × 355) = 19,3 .
w (104) , , mxy = 0,0193:
d2 = 10 mxy = 10 × 0,0193 = 0,19 > 0,15, d2 = 0,15;
w = 0,85 ‑ 0,008 Rbs + d2 = 0,85 ‑ 0,008 × 10,5 + 0,15 = 0,916 > 0,9, w = 0,9.
, :
= 264 ;
h¢f = 80 (. . 81).
. 3.67.
(14) xR ssc, = 500 :
Aov = (b'f ‑ b) h¢f = (264 ‑ 360)80 = ‑ 7680 2.
:
= 433 > xR ho = 0,794 × 330 = 260 , (132).
:
e = eo + = 55 + = 205 .
(131):
Rbc,redbx (ho ‑ x /2) + Rbc,redAov (ho ‑ h¢f /2) + Rsc A¢s (ho ‑ a¢) =
= 26,3 × 360 × 293 (330 ‑ 293/2) ‑ 26,3 × 7680 (330 ‑ 80/2) +
+ 365 × 4070 (330 ‑ 30) = 896,1 × 106 H × > Ne = 3900 × 0,205 = 800 × ,
. . .
. 3.60 :
ho = h ‑ a = 400 ‑ 50 = 350 ;
w = 0,85 ‑ 0,006 Rbs,ser = 0,85 ‑ 0,006 × 15 = 0,76;
= 273 ; h¢f = 100 ;
Aov = (b'f ‑ b) h¢f = (273 ‑ 400) 100 = ‑12700 2;
Rs = Rsc = Rs,ser = 390 ;
e = eo + = 55 + = 205 ;
Rbc,serbx (ho ‑ x /2) + Rbc,serAov (ho ‑ h¢f /2) + RscA¢s (ho ‑ a¢) =
|
|
= 22 × 400 × 254 (350 ‑ 254/2) ‑ 22 × 12700 (350 ‑ 100/2) + 390 × 4070 (350 ‑ 50) =
= 890,8 × 106 H× > Ne = 3300 × 0,205 = 677 ×.
. . 3.93 3.112.
, , :
Aef = 170 × 360 = 61200 2.
, 20 1/3 (50 × 1/3 = 17 ), 170 .
Aloc1 = 200 × 170 = 34 000 2.
360 < 3 × 200 , Aloc2 = Aef = 61200 2,
, Rbc = 19 (. e. g2 = 1,1):
R*b,loc (197), yloc = 0,75:
R*b,loc = yloc (Rb jb + jmxy Rs,xy js) = 0,75 (19 × 1,22 +
+ 1,97 × 0,0226 × 355 ×2,56) = 47,7 .
(229) .
Æ36 :
= 9 .
l = lo = 400 .
. 72 II-23-81 l = = = 44,4 Ry = Rs = 365 j = 0,838, Nout = 0,5 jRss = 0,5 × 0,838 ´ 365 × 8140 = 1245 × 103 H.
, , :
N = R*b,loc Aloc1 + Nut = 47,7 × 34000 + 1245 × 103 = 2867 × 103 H.
3.115. , (. 82), :
(230)
(231)
Q , ;
tk, hk, lk ¾ , ;
k , .