(
) (
).
:
/ / / = 40, = 40, 1=2 = 0/ /
- Iy = 0.00213333 
; 
0.16 
.
:
/ / / = 120, = 15, 1=2=H1=H2=30/ /
- Iy = 0.0405 ; 0.27 .
/ / / / 25/ / b = 22.510 
/ 
.
:
= 22.510 0.16=3.6x10 =360000 .
= 22.510 0.0021=47250000 =4725 .
:
= 22.510 0.27=6.075x10 =607500 .
= 22.510 0.0405=911250000 =91100 .
.
, , ( L\ \ \ - 2\ _) (.4.2.).
4.2.
.
= 
=21.3
100 = 0%.
:
0.293/.
0.285/.
= 
7.39
100 = 10%.
, . .
/ / .. /
. , b=40, h=40. : 1=5 , 2=5 . 25. 400, 240. γb2 = 0.9. : N=21.3 ; M=6.7 .
2- . : 0.3 ; 0.4 .
4.3.
4.3.
