.=88,41,3812=1463,9
:
.=.+.+.=470,868+898,38+1463,9=2833,152
6.1
"" . 0,6 2 60 .
, , . - . . . 1 , . , , , . , , . , , . , . , . , . , , . . . . . 50 , . .
6.2
15 .
7,0 , - 1,63 , 2 ( ) 3,5 . 20.
6.3
11 [5]:
Fd=gc(gcrRA+uågcffihi),
R - (.7 [5]);
|
|
- ;
u - ;
fi - i- (. 2[5]);
hi- i- ;
g 0,8, gcr 1, gcf 0,8 .
R=66 /2
=3,143,5²/4=9,621 ²
u=3,142=6,283 .
16.
h1=1,15 z1=1,925 f1=1,638 /²
h2=1,2 z2=3,10 f2=2,01 /²
h3=1,5 z3=4,45 f3=2,28 /²
h4=1,57 z4=5,985 f4=2,49 /²
h5=1,58 z5=7,56 f5=3,05 /²
Fd=0,8(1669,621+6,2830,8(1,6381,15+2,011,2+2,281,5+2,491,57+ +3,051,58))=574,112 .
=574,112/1,4=410,08 ≥ 291 .
6.4
:
n=NI1,2/P
n=2911,2/410,08=0,852
n=1.
6.5 .
17.
: V=1,2²1,2=1,728 3
N=Vg=1,7282,5=4,32
: V=pS2/(4H)=3,1416,1042/(47)=29,09 3
N=Vg=29,092,5=72,725
: V=V-V-V =73,143,5²/4-1,728-29,09=36,53 3
N=Vg=2,513((1,751,25+2,010,1)/(1,25+0,1))=64,628
6.6
4[5].
:
,
N , , ();
EA ‑ , ();
G2 - , (/2);
db .
N=NI+N+N=291+4,32+64,628=359,948 ;
=275000 /2=275 /2 20;
=31415,93 2
=27531415,93=8639380,75
G2='/(2(1+ v2)),
' , 10 (35 ).
v2 - (0,25 .. 4.2[2])
G2=1563/(2(1+0,25))=625,2 /2
db =3,5
< S=8 .
6.7
, .
6.8
:
=18529,09=5381,65 .
, .