(.12, ), = 509,4ͷ.
. 1.12. :
;
.
3.26[5]:
b f = b + 21/6 l 01 = 0,3+21/67,94=2,947=2947.
h 0 = h a = 75075=675, a = 75 -Ø25Ø32.
R b b f h f (h 0 0,5 h f )=14,5294770(6750,570)=1914,4106ͷ=
=1914,4ͷ> M = 509,4ͷ,頠 b =
= b f = 2947.:
α m = M /(R bh 2)= 509,4106/(14,529476752)=0,0262< α R = 0,391.
b 0
:
2
A s = R b bh 0(1-
1- 2 α m)/ R s = 14,5× 2947× 675(1-
1- 2× 0,0262)/350=
2185.
:2Ø28A400+2Ø25A400(A s= 1232+982=22142).
(.12, ), = 515ͷ. h 0 = h a =
= 750 75=675. α m = 515106/(14,53006752)=0,260< α R = 0,391.:
2
A s = R b bh 0(1-
1- 2 α m)/ R s = 14,5× 300× 675(1-
1- 2× 0,260)/350= 2575.
:2Ø32A400+2Ø28A400(A s = 1609+1232=28412).
:2Ø12A400(A s = 2262).
.- Q =Q ,max=352,8.
.3.33, [5];.13.
.13. :
;
, - = 1800 . α =
= / h 0 = 1800/708=2,542<3; α 0= α =2,542>2, α 0=2.
ε ε :
Ɛ
= 1,5+ 0,1875 α 0
α
= 1,5
2,542
+ 0,1875× 2= 0,965;
Ɛ= Q =
352,8×103
= 1,578.
R bt bh 0
1,05× 300× 708
ε = 1,578> ε = 0,965,(3.51)[5]:
q sw
= R bt
b Ɛ- 1,5/ α
0,75 α 0
= 1,05× 3001,578- 1,5/2,542= 207,5/.
0,75× 2
Æ8500(R sw =300);4(..13, )- A sw = 2012;:
w |
|
|
q sw
= 300× 201= 290,6.
207,5
.5.21[5]-0,5 h 0=0,5708=354300.(3.60)[5]:
s w. max = R bt bh 02 / Q max = 1,053007082/(352,8103)=448.
s w = 290, -- q sw = R swA sw /s w = 300201/290=207,9/>207,5/.
(3.43)[5]:
0,3 R b bh 0 = 0,314,5300708=923,9103H=923,9> Q max = 352,8,
,.
-.-,,- a h 0.,--: a =ΣA sia i /ΣA si.
2Æ28A400(.14, ),
f |
=70,:
M ult = R s A s (h 0 0,5 x)=3501232(7080,510,09)=303,1106ͷ=303,1ͷ.
2Æ28A400+2Æ25A400(.14, ), a = (1232·42+982·112)/ (1232+982)=73; h 0 = h a == 75073=
=677;
A s =22142; x = 3502214/(14,52947)=18,13< h f = 70,:
M ult = 3502214(6770,518,13)=517,6106ͷ=517,6ͷ.
:2Æ12A400(. 14, ), A s =2262; x = 350226/(14,5300)=18,18,
M ult = 350226(7020,518,18)=54,8106ͷ=54,8ͷ.
:2Æ32A400(.14, ), A s =16092; x = 3501609/(14,5300)=129,5,
ult =3501609(7020,5129,5)=358,9106ͷ=358,9ͷ.
26 |
. 14.:
Q ; ...