.
. , (184), 800320 155250 Rb = 13 (.. = 0,9);
ͷ > = 84 ͷ,
.. (184) .
b = 300 h = 800 , .
0,5 Qb =0,54600,3=69 ͷ < =84 ͷ, . 3.85 3.86, 1- 2- .
2- . 3.87.
:
;
s2 = 1609 + 314 + 380 = 2304 2 (2Æ32 + Æ20 + Æ22).
< 1, (182):
.
s 2 = 100 , :
Asw2 = 1,54 100 = 154 2.
14 (Asw2 = 154 2).
, . 3.85 (1- ).
. 61, As1 = 3217 2 (4Æ32) = 1388 2 (2Æ20 + 2Æ22), ' = 68 .
(172) 1, Rb = 16 (.. = 1,1, ):
> 2 / = 2 68 =
= 136 .
, , .. s 1=100 , Asw1 =154 2,
/;
h 0 = 800 - 80 = 720 .
qsw1b (h0 -0,5 x1) = 446,6300(720-0,5139)=
= 87,2106 ͷ < ͷ. , qsw .
(173):
<
< RsAs (ho -0,5 x1)=3653217(720-0,5139)=763,8106 ͷ,
.. .
(176) , :
qsw1b(h0 - 0,5x1) = 446,6300(720-0,5139)=87,2106 ͷ > ͷ,
.. .
. 61, , , , , , (174).
, Æ 32 , , : 61, , A/sw = 1609 2 (2 Æ 32); / = 62 ; As1 = 1388 2 (2 Æ 20 + 2 Æ22); = 68 .
1, Rb = 13 (.. =0,9, ):
|
|
< 0.
1 = 2', h0 - 0,5 x1 = h - a - a' = 800 - 68 - 62 = 670 .
14 (sw1 = 154 2) s1 = 200 ,
/.
. 61, , :
ͷ;
max = 321 ͷ.
(174):
<
< RsAs1 (h0 - 0,5 x 1) = 3651388670=339,4106 ͷ,
.. .
, l 200 , (176). =tlx, qsw1b(h0 - 0,5 x1) = ,
, 100 2,45-1,47 1 .
47. : - . 62, ; , , - . 62, ; 25 (Rb = 13 = 0,9); -III (Rs = Rsc = 365 ; Rsw - 290 ).
.
. 200400 350400 (184):
= 84,5106 ͷ > = 40 ͷ.