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2.2.2. Tegangan Bending M o m e n b e n d i n g s e b u a h p o r o s i n e r s i a u t a m a , m e n i m b u l k a n t e g a n g a n
b e n d i n g .
a . M b W b
( 2 . 1 4 )
M o m e n b e n d i n g M b d a r i s u a t u g a y a F t e r h a d a p a , d i d e f i n i s i k a n s e b a g a i - u s 1 d a r i a k e g a r i s a k
: P e r k a l i a n b e s a r g a y a F d e n g a n j a r a k t e g a k l u r u s 1 d a r i a k e g a r i s a k s i F . s e p e r t i p a d a g a m b a r 2 . 6 .
y
<
I Gambar 2.6. Pembebanan Bending
M b = F . I
M o m e n t a h a n a n b e n d i n g d a p a t d i n y a t a k a n s e b a g a i b e r i k u t :
W b I x e
( 2 . 1 5 )
( 2 . 1 6 )
d i m a n a : I x = m o m e n i n e r s i a ( i n 4 ) e = j a r a k y a n g t e r d e k a t d e n g a n s u m b u ( i n ) W b = m o m e n t a h a n a n b e n d i n g ( i n 3 ) ( J b = T e g a n g a n b e n d i n g ( p s i )
B e s a r n y a m o m e n t a h a n a n b e n d i n g t e r g a n t u n g d a r i b e n t u k p e n a m p a n g d a r i e l e m e n , u n t u k m e n e n t u k a n m o m e n i n e r s i a d a n m o m e n t a h a n a n b e n d i n g d a p a t d i l i h a t p a d a t a b e l 2 . 1 .
Tabel 2.1. Cara
Bentuk Penampang
a w
m y/J
d o
M
2.2.3. Tegangan Geser
T e g a n g a n g e s e r d a p a t d i b e d a l < p a d a e l e m e n y a i t u : 1 T e g a n g a n g e s e r l a n g s u n g
2 . T e g a n g a n g e s e r p u n t i r
1 6