M=Mtot=76,33 z=169
ss= =258,5 .
esp=0 .. P2
¾ M=Ml=63,24 z=167 ;
ss= .
¾ M=Ml=51,69; z=154.
ss= .
¾
acrc=d·jl·h·(ss/Es)·20(3,5-100·m) =0,22
¾
acrc=d·jl·h·(ss/Es)·20(3,5-100·m) =0,11
¾
acrc=d·jl·h·(ss/Es)·20(3,5-100·m) =0,21
¾
crc1=0,22-0,11+0,21=0,32>[0,3]
¾
crc2=0,21> [0,2]
.
M=M l =63,24 ·; Ntot=P2=289,3 . es,tot=M/Ntot=63,24·106/289,3·103=218,6 .
jm, r= l=63,24 ·
jm=(Rbt,ser WInf pl)/(r-Mrp)=(1,6·21637·103)/((63,24-38,94)·106)=1,424>1Þjm=1
jls=0,8.
.. es,tot/h0=219/190=1,15< 1,2/0,8=1,5. es,tot/h0=1,15,
ys=1,25-jlsjm-((1-jm2)/((3,5-1,8jm)es,tot/h0)))=1,25-0,8·1=0,45<1,0
. 4.27[2] n=0,1 yb=0,9
j
[5, (269)]:
f3= 7,8·10-6·5/48*57752=2,73 . < fu= 2,89 .
, .
. . , . . h = 600 . b = 250 .
1 . . 5,9 .
: - ( g n = 0,95) 4,2365,90,95 = 23,743 /; - ( 0,250,6 , r = 25 /3, g f = 1,1 g n = 0,95) 0,250,6251,10,95 = 3,92 /.
|
|
: g = 23,743 + 3,92 = 27,663 /.
( g n = 0,95) V = 65,90,95 = 33,63 /.
q = 27,663 + 33,63 = 60,97 /.
. 25, g b2 = 0,9 ( 65%) Rb = 14,50,9 = 13,05 ; Rbt = 1,050,9 = 0,945 .
-III Rs =365, αR=0,422 ξR=0,604.
, .
: B x H = 250x600 .
.5
(.5,), M = 274,4 ͷ, h 0 = h a = 600 60 = 540 .
[3 . 3.18].
a m = M /(Rb b h 20) = 274,4106/(13,052505402) = 0,288 < aR = 0,422, , . I a m = 0,288 z=0,826, : AS = M /(RS z h 0) = 274,4106/(3650,826540) = 1686 2.
4 Æ 25 -III As = 1963 2.
.5 :
- , -
(.5 ), = 189,7 ͷ h 0 = 600-45=555
a m = M /(Rb b h 20) = 189,7106/13,052505552 = 0,189 < aR = 0,422, z = 0,894,
AS =189,7106/(3650,894555)=1048 2. 2Æ28 A-III (As=12322.)
2Æ12 A-III (As=226 2)