. 62, h0 =800-50=750 .
2- . 3.90. , , , , , , . 3.97:
( hs = 400 - 50 = 350 ).
, , F , F b = 300 ,
= 2 hs + b = 2350 + 300 = 1000 = 1 ,
..
, q sw2 sw2 = 154 2 (1Æ14) s2 = 100 (. . 62, ) :
. 58, 62, , bf,min = 200 , h = 800 , bov =0, As2 = 1071 2 (1Æ32 + 1Æ12+1Æ14).
2 :
. 2 < 1,94 , . . , 2 = 1,2 .
Q T , .. ; = 40 ͷ.
RsAs2 = 3651071 = 391103 < 2 qsw2h = 2372800=595103 , RsAs2 = 391 .
2 . 3.20, h0 = b0 = 200 -50 = 150 b = h = 800 ( ).
' = 50 h0 = 150 , 2 :
< ' = 50 .
(187), bow = bo = 150 :
>
> + 0,5 Qbf,min = 40 + 0,5 × 293,5 × 0,2 = 69,35 ×,
. . 2- .
1- . 3.89. b'f = b = 200; bf= 350; s1 = 2526 2 (3Æ32 + 1Æ12); ¢s1 = 308 2 (2Æ14); sw1 = 154 2 (1Æ14); s1 = 200 .
c1:
c1 = 2h + 2bf + b'f ‑ 2b =
= 2 × 800 + 2 × 350 + 200 ‑ 2 × 200 = 2100 .
. c1 > 1,94 , .. , c1 = 1,94. , .. ×; = 40 ×.
:
,
1 = 311 < xR ho = 0,604 × 750 = 453 ( xR ‑ . . 18);
.
2qsw1 bf + = 2 × 223 × 350 × + = 636,2 × 103 H < Rs As1 = 365 × 2526 = 922 × 103 H, Rs As1 = 636,9 × 103 H.
(185), how = ho = 750 :
. . 1- .
|
|
3.93(3.39). ()
, (194)
N ;
Aloc1 (. . 63);
y , :
1,0;
( , , ) 0,75;
Rb, loc ¾ ,
Rb, loc = ajb Rb, (195)
ajb ³ 1,0;
a = 1,0 25;
a = 13,5 Rbt /Rb 25 ;
jb = ,
:
. 63, , , , , :
, :
7,5....................... 2,5
3,5; 5; 7,5................. 1,5
2,5........ 1,2
. 63, , , ¾ 1,0;
Rb, Rbt (. . 5 . 9);
Aloc2 , . 3.94.
(194) , . 3.95.
3.94(3.40). Aloc2 , (. 63). :
b b (. 63, );
Aloc2 Aloc1 (. 63, );
, , , (. 63, );
, (. 63, );
(. 63, ) Aloc2 Aloc1;