' l ' . , ' l ' . l =14,4.
P=2*k*V, k=1.05 ,
V- ;
P=84.93 *2*1,05=178,353
3.2.1. .
3.2.3. .
. . 'h'. 255. :
1. .
2. .
,
h ≤ 1.3 :
(3.2.2)
h ,
h ≈ 0.1* l =0.1*14.4=1.44;
l ;
= 1.15 ;
γ = 1.
h>1,3: ,
=100÷160- ;
,
h 0,114,4 = 1,44 = 144,
tw = [7 + 3(h,)] = 7 + 31,44 = 11,32 = 1,132,
tw 1.2
:
,
= 0.8072 = 80.72.
h, hmin h = h = 96,43 =0,9643, h<1 h 5, .. h = 1.
:
,
Rs Ry Rs = 0.58 Ry =0.5825=14,5 ;
hef
=0.475 =4,75 .
.. tw(min) < 6, , tw = 6 .
bf, tf f :
,
Ix , :
,
Iw , :
,
385250 4,
= 45633.654,
:
= 67.92 ².
:
= 0.27100=27 =270 ,
bf 20 =280
=2.6 c =26 ,
bf tf , :
.
82-70:
tw = 0.6 , hef = 94.8 , tf = 2.6 , bf = 28 .
:
Aw = heftw = 0.9480.006 = 0.00569 ²,
A = Aw + 2bf tf, Ix, Wx, Sx.
= 0,00569+20,280,026 = 0,02025 ²,
.
h0=h-tf =100-2.6=97.4 c
= 387998.654 c4
|
|
= 7759.97 c³,
,
=4219.388 c3
, :
,
= 24.82 /² 24.82 /² < 25 /²
.
3.2.4. .
. , bf, h, tf, tw.
bf1 (0.5 ÷ 0.75)bf, . , :
bf1 = 0.5bf = 0.50.28 = 0.14 ,
bf1 = 0.14 , .
bf Ix1, Wx1, Sx1, Sf1, Sf1 .
=
= 215298.612 c4,
=4305.97 ³,
=2445.287 3,
, , :
M1 = Wx1Ryγc,
γ = 1.
M1 = 4305.97251= 107649.25 ͕.