1 31100-80 (.) : .= τ F = 0,63σ = 0,63160 = 20257, : τ , F .
=20200 = 20,2 ( 1 31100-80).
, 1,2.
: 44222 . .
: 3645
:
44372 .
[10], 25.625 () , , .
R=44372. 1,25= 55465.
R.
n = 4 .
= = 13866. = = 1,46.
16.
σ =85 /2, =11000 /2
τ=0,5 σ =0,5×85=42,5 /2,
. II. 29. , - (b) (d) = 2. , h1= d = 16. = 1,4 , = 0,97.
.2 , : d=16, b= 32, x=8, = 20-8=12, = 2, = = = 1,5, = 0,97.
.3 , 2 .
, , : () , 2- . = 2 = 2 = 27732, R- ;
4- ; 2- (. .3).
. , d=16.
[ 2 ], .274, σ =σ = 85 /2,
= 20,4
= 22 , : σ = = = 78.8 /2. : h = = 1,08.
2- (. .4)..
τ=0,5 σ =0,5×85=42,5 /2.
τ = = 31,5 /2. : h = = 1,35.
2- (. .5).
= 0,97 σ = 0,97ˑ σ = 0,97ˑ85 = 82,45 /2.
σ = = = 78,8 /2. h = = 1.05
= 218-32 = 186.
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