d b =2,7 , d = 1,75 :
R=R 0[1 + k 1(b - b 0)/ b 0](d + d 0) / 2 d 0 = 250[1+0,05(2,7-1,0)/1,0](1,75+2,0)/22=251 ; |
Ninf = Nn + Adgmt, =1333+8,911,7520=1635,94 |
.
Minf = Mn - Qnh = 44,32-22,171,6=6,63 ͷ. |
pmax pmin
<1,2 R =298 , |
. .
. l × b =3,0×2,4 , =7,2 2. b =2,4 : R =251 .
<1,2251=296,4 .
.
.
hpl =0,6 (. 7.5). l 1× b 1=2,1×1,8 .
γf >1. gf >1,0, ( )
.
. 7.5.
,
.
F =275< Rbt bm ho,pl = 0,751430530 = 568425 =568,425, |
bm = bcf + h 0, pl =0,9+0,53=1,43 .
.
, . 1-1 1=0,45 2-2 2=1,05 (. 7.5), = M/N= 50,97/1532,96=0,033 .
:
- 1
;
; ;
2;
- 2
;
; ;
2.
12 Ø16 A300 c As =2412 2.
m =1532,96/7,2=212,9 .
3-3 4-4:
ͷ;
ͷ;
3-3 4-4
; ;
2
; ;
2
15Ø12 A300 c As =1696 2. .
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