6.6-misoL Uzunligi 5m, ko'ndalang kesimi 6.11-rasm, a da ka'rsatilgan po 'lat sterjenning ikki uchiga Mh =500 N m burovchi moment ta ’sir etadi. Po 'lat sterjenda vujudga keladigan eng katta urinma kuchlanish va bura lish burchagi aniqlansin. Yechish. E n g a w a l m u ra k k a b s h a k ln i o d d iy e le m e n tla rg a a jra ta m iz
(6 .1 1 -ra s m , b ), s o 'n g ra h a r q a ysi e le m e n tn in g g e o m e trik ta v s ifla r in i a n i
q la y m iz :
•Л =
Jk\ + •Л-з +
^кЪ B ir in c h i e le m e n tn in g o M ch a m la ri h ,= 4 5 m m ;
b t= 3 5 ; h,/Z > ,= l,2 8 5 ; Jk,= p
95
4
6 .1 1-rasm.
h , / i , 3. 6 .1 -ja d v a ld a n h , / t , = 1,285 boMgan nisbat u c h u n a ,= 0 ,2 2 1 ; p ,= 0 ,1 7 2 .
U h o ld a
Wn = a , h t f = 0 ,2 2 1 • 4 ,5 • 3 ,5 2 = 12,
I s m 2; J tl =
P fab] = 0 , 1 7 2 - 4 , 5 - 3 , 53 = 3 3 ,2
sm*; ^ * L = 1 M
sm = 2,12sm . Wt, 1 2 ,2
S hu y o ‘ sinda oM cham lari h2= 8 0 m m ; 6 2= l0 m m ; h ,/6 ,= 8 boMgan ik k in c h i
ele m e n t uchun q u y id a g ila rn i a n iq la y m iz :
Wk 2
= а ,Қ Ь 1 = 0 , 3 0 7 - 8 - 12
= 2 , 5 s m 3; J k2 = PjhJ>l = 0 ,3 0 7 • 8 • 1:2 =
2 ,5 s in * ;
^
= 1
sm Wк 2 S terjen k o 'n d a la n g k e s im in in g 3 -q is m i oM cham lari h 3= 9 5 m m ; Z>j=20mm;
h 3 9 5
— = 4 ,7 5 - B u la rg a mos g e o m e trik ta v s ifla r:
