Yechish:
K o ‘ nda lan g c h o k q a b u l q ila d ig a n ruxsat etilgan zo ‘ riq is h (5 .2 0 )
fo rm u la d a n a n iq la n a d i.
F < [ < ? y s .
C h o k n in g
h is o b iy u z u n lig i, payvand chokdagi ba’ zi
n u q so n la m i hisobga
o lis h
maqsadida, asosiy u z u n lik d a n 1 sm kaltaroq o lin a d i:
—10 — 1 = 9
s m
,
K o ‘ ndalang c h o k n in g h is o b iy q a lin lig i ulanayotgan lis tla rn in g
q a lin lig ig a teng
boMadi: = Is m • Payvand c h o k uchun ruxsat etilgan z o 'riq is h :
F < 100,0-9-1 = 9 0 k H ga, u la n a yo tg a n lis tla r uchun esa:
F < [cr]Z>£ = 1 4 0 ,0 -1 0 -1 = 140
кН
ga teng.
5.5-misol. Ustma-ust ulangan
ikki listn in g yo n bosh ch oklari
uzunligi aniqlansin (5.17-rasm).
Cho'zuvchi kuch F
=
140kH, chok
metali uchun ruxsat etilgan kuch
lanish
[ ^ ] = 8 0 ,0 М Р а .
Yechish:
( 5 .2 1 ) fo r m u la g a
k o ‘ ra c h o k n in g
h is o b iy u z u n lig i
q u y id a g ig a te n g boM adi:
0.8 sm
t
10
sm
4
5. J 7-rasm.
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