.
1. 5.0.
2. 2.4.
3. 15.
4. 6.
5. () 7,4͕².
.
, , , - . . , , .
() : t= 10-20 =1.5-2.5 =2.4.
L =a*6=14,4.
.
.
.
.
() .
.
1
| N. / | , /² | - γƒ | , /² | |
| . . t= 40; γ = 18/³ p1= 180.04 = 0.72/² / t = 150; γ = 25/² p2 = 250,15 = 3,75 /² 3 = 0.2/² | 0.72 3,75 0.2 | 1.3 1.1 1.05 | 0.94 4,125 0.21 | |
| 4.67 | 5,275 | |||
| . () q | 7,4 | 1.2 | 8,8 | |
| (p+q) | 12.07 | 14.155 |
.
:
g = (p + q)a = 14.1552.4 = 33,972/.
:
Mmax = 
= 33.9725² / 8 = 106,163 ͕.
:
Qmax = 
= 84.93 .
.
.
255.
Ry ( ) - II-23-81*, .51 [2]: Ry = 250 = 25/².
:
max = max;
Wn,min , .. W;
|
|
|
γ , γ = 1.1
- II-23-81*, .6 [2].
1 , 1 = = 1. (3.1.1) :
³.
W = 386,05 ³, , , Wx > W :
301:
Wx = 424,1 ³;
Ix = 63194;
Iy = 441,94;
b = 149;
t = 8;
tw = 5,5;
h = 298;
Sx = 237,5³.
( t), Ry (Ry = 240) :
, 1=1.097;
= 22,82/² < 24 /²,
22,82/² < 24 /² 5%
.
:
B , B = 5;
g = (p + q)a = 28,968/.;
= 2,06*105;
|ƒ/B| - , |ƒ/B| = 1/200 = 0.005.
0.00362 < 0.005,
.
:
,
Mmax = ;
Wx ;
γ = 0.95 ;
φb , [3], 7.
, 1500 3000.
[2], (174) :
h ;
ψ , :
1) lef=l, ψ =1,6 + 0.08α:
2) lef= 
, ψ = 2,25 + 0.07α;
4
1) lef=l
=5,29
. α<40 ψ1=1,6+0,085,29=2,023
ψ=1,14ψ1=2,83
. φ1 ≤0.85 φb= φ1=0.61
σ 
2400.95, 
410,37>228
.
2) lef=
=2,04
. α<40 , ψ = 2,25 + 0.07α=2,39
ψ=1,14ψ1=2,72
. φ1 >0.85 φb= 1
σ 
2400.95, 250,325>228
.
.
, 
, 
.
.
