¾ N
S S¢; ¾ , S S¢
(160) > xRh 0, (159) = xRh 0, xR . 18 19.
< 0, (157).
¢ (157).
. e ¢ > h 0 a ¢ , , 2 ¢, , (159) (160) .
3.79. :
) e ¢ £ h 0 a ¢ S S¢ :
(161)
(162)
) e ¢ > h 0 a ¢ As
(163)
x . 20
(164)
am £ aR (. . 18 19). , .
am < 0, As (161).
¢ (161).
. ¢ > h 0 a ¢ , (161), , x, . 20 , . . 2 ¢/ h 0. As
(165)
z . 20
( ,
)
3.80. (. . 45)
(166)
¾ N , , , , ;
Sb ¾ ;
Ssi ¾ i - ;
ssi ¾ i - .
ssi (154) (155) N .
(154) (155) , , (. . 45).
|
|
,
3.81. . 3.28¾3.41. Mb . 3.31
(167)
0,8;
Qb,min jb 3 (1 + jf jn) Rbtbh 0. , . 3.29, 3.40 3.41 jb 4 jb 4 (1 jn).
. 3.42¾3.45. N (160) . 3.80.
e ¢ < h 0 a ¢ , , , S¢.
42. : b = 500 , h = 200 ; = ¢ = 40 ; A-III (Rs = Rsc = 365 ); As = A¢s = 982 2 (2 Æ 25); 25 (Rb = 16 gb 2 = 1,1); N = 44 ; = 43 .
.
. h 0 = 200 40 = 160 ;
;
;
.
, (157):
. . (157) . ¢ = 1037 > h 0 a ¢ = 120 , , (160) :
. 3.78 (159), = 40 A ¢ s = 0:
. . .
43. : b = 1000 , h = 200 ; = ¢ = 35 ; 15 (Rb = 7,7 gb 2 = 0,9); A-III (Rs = Rsc = 365 ); S¢ A ¢ s = 1005 2; N = 160 ; = 116 ͷ.
S.
. h 0 = 200 35 = 165 ;
;
;
.
¢ = 790 h 0 ¢ = 165 35 = 130 , . 3.79.
0 < am < aR = 0,44 (. . 18), As (163). . 20 am = 0276 x = 0,33.
As = 3079 2 (5 Æ 28).
44. : b = 1000 , h = 200 ; = ¢ = 40 ; 15 (Rb = 7,7 gb 2 = 0,9); A-III (Rs = Rsc = 365 ); N = 532 ; = 74 ͷ.
.
. h 0 = h a = 200 40 = 160 ;
;
;
.
, (161):
|
|
2.
¢ = 199 > h 0 ¢ = 120 , . 3.79 As .
x . am:
. 20 am = 0,213 x = 0,24 z = 0,88. As (165):
2.
As = A ¢ s = 2281 2 (6 Æ 22).
45. : b = 500 , h = 200 ; = ¢ = 40 ; 25 (Rbt = 1,15 gb 2 = 1,1); , , A-III (Rsw = 285 ); N = 44 ; Q = 143 ; l = 600 .
.
. h 0 = h = 200 40 = 160 . . 3.33 . 3.81.
Mb (167), jb 2 = 2 (. . 21), jf = 0 0,096 < 0,8:
ͷ.
, , . .
< l = 160 .
2 h 0 = 2 160 = 320 < = 533 , 0 = 2 h 0 = 320 .
æ:
æ
1,667 < æ = 1,866 < 3,33, (63):
/.
, . 3.30, :
, , . 5.58, 2 h = 2 200 = 400 .
s = 100 < smax,
2.
10 (Asw = 157 2).