. h¢f = hf = 200 + 30/2 = 215 .
:
2;
.
l 0/ i = 16 200/520 = 31,1 < 35 l 0/ i > 14, . 3.54, Ncr :
h (91):
As A¢s = ¢ = , h 0 = h a = 1500 79 = 1421 .
:
(130):
. . .
:
2.
:
.
. 18 xR = 0,523. = 228 < xR h 0 = 0,523 1421 = 743 , (131):
. . .
. :
4;
.
l 0/ i = 10 800/134 = 80 l 0/ i = 31,1, . 3.51 , 0 . h = 600 .
, . 3.50, = , = , . 3.64, , , . . b = 2 215 = 430 .
, , As,int = 4826 2 (6 Æ 32), As,tot = 11 260 2 (14 Æ 32). As,tot /3 = 11 260/3 = 3750 2 < As,int = 4826 2, . 27 (. ). . 27 Nl/N = 2000/2500 = 0,8 l 0/ h = 10,8/0,6 = 18 jsb = 0,724.
, j = jsb = 0,724.
(119):
. . .
34. : ¾ . 49; 30 (Rb = 19 gb 2 = 1,1; Eb = 2,9 104 ); A-III (Rs = Rsc = 365 ); N = 6000 ; = 3100 ͷ; : l 0 = 16,2 , l 0 = 10,8 .
.
. 33 : h¢f = 15 ; h 0 =1421 ; ¢ = 79 ; Ncr = 28 270 .
(91) h:
:
(130):
. . .
:
2.
an, am 1, aov, am,ov, d:
. 18 xR = 0,523.
|
|
x = an aov = 1,111 0,302 = 0,809 > xR = 0,523, (135). (136) (132) as
. 18 y = 3,0 w = 0,698.
As = A¢s = 5630 2 (7 Æ 32).
33.
35. : r 1 = 150 , ¾ r 2 = 250 ; 25 (Rb = 16 gb 2 = 1,1); A-III (Rs = Rsc = 365 ); As,tot = 1470 2 (13 Æ 12); N = 1200 , 0 = 120 .
.
. :
2
:
.
0,15 < xcir = 0,502 < 0,6, (138):
. . .
36. : D = 400 ; = 35 ; 25 (Rb = 13 gb 2 = 0,9; Eb = 2,7 104 ); A-III (Rs =Rsc = 365 ; Es = 2 105 ); As,tot = 3140 2 (10 Æ 20); : Nl = 400 ͷ; N = 600 , = 140 ͷ; l 0 = 4 .
.
. :
2;
;
, . 3.54, Ncr (92). :
;
[ b = 1,0 (. . 16)];
0,583 > de,min = 0,5 0,01 l 0/ D 0,01 Rb, de = e 0/ D = 0,583.
:
4;
4;
h (91):
. 41.
0,702 am = 0,51.
amRbAr = 0,51 13 125 600 200 = 167 106 ͷ = 167 ͷ > Ne h = 600 0,233 1,12 = 156,6 ͷ, .
37. 36 , . 41.
. 36 i = 100 , = 125 600 2, rs = 165 . l 0/ i = 4000/100 40 > 35, , Ncr (92).
As,tot = 0,01 A = 1256 2, 4.
36 jl = 1,695, de = 0,583, I = 1256 106 4.
as = 0,74, 2.
(As,tot = 1256 2), As,tot = 3310 2 , , Ncr.
2 :
4;
;
an = 0,367 . 41 as = 0,68.
2.
As,tot = 3142 2 (10 Æ 20).
|
|
,
38. : b = 400 , h = 600 ; 25 (Rb = 16 gb 2= 1,1); A-III (Rs = Rsc = 365 ) . 50; N = 2600 : , h, Mx = 240 ͷ , b, My = 182,5 ͷ; y .
.