d BdGSGdENGdS GdN3GdEB GdNGGdNS Gd33GdN3 Gd3GdN.
Trang 36
. 2 σ
Trang 5EJ f
KG l
EJ f
KG l
EJ f
Trang 6- • *‘ P C t pz S pz V pz k pz( KG )
M n y x pz
z =
, * P C t py S py V py k py ( KG )
M n y x py
y =
~ &/ • *; P C t px S px V px k px( KG )
M n y x px
x =
87‘d 87 d 87;@: 4^
Trang 960KG mm
bp ≤
σ
35 , 0 75
= bp Mpz
% M7
2 /
60KG mm
bp ≥
σ
35 , 0 75
= bp ppz
75 , 0 75
= bp Mpz
35 , 1 75
= bp Mpy
75
= bp Mpy
=
75
bp Mpx
75
= bp Mpy
4 , 0 190
= HB
k Mpz
55 , 0 190
= HB
k Mpx
1 , 1 190
= HB
k Mpx
Trang 10C V
v
v y x
a≤ Gd?0
a • Gd?0
BSdSd3 Gd?0
GdGd33
GdB
?Bd Gd?0
Gd0GGd33
a≤ Gd?0
a • Gd?0
30dGB3dG Gd?
Gd?0Gd0
Trang 11% M7 & k & • \ k # k & • @ 7 \ k
& • \ • @ 7 \ k & • k & • @ 7 \ •
k = σ
Trang 133; 3
?;?G
φ 3
?G;?G 3;?0 φ?G φ?0
G;B0 BG;BG
Trang 15102 60
Trang 17GdG3÷GdG BGdG0÷Gd G
?dG ÷GdGN
GdGB÷Gd GGdGB÷GdGEGdG?÷GdG0
Gd B÷GdG
Gd G÷Gd?
GdGN÷Gd 0
GdGE÷Gd?GGdG3÷Gd 0GdGB÷Gd G
Gd 3÷GdN0Gd?B÷Gd00
Gd E÷Gd ?
Gd G÷GdBEGd? ÷Gd ?
Gd S÷Gd0GGd?3÷Gd B
Gd N÷Gd?0
d?÷ dNGdEB÷ dGGd00÷Gd3E
GdEG÷ dG0Gd3G÷GdN3
Gd E÷GdBE
Trang 18%e G
3G
GdS÷ dGGd3÷GdNGd0÷Gd3
GdN÷GdEGd0÷Gd3
Gd ÷GdB
Gd3÷GdNGdB÷Gd0
Gd ÷GdB
dB÷ dE
dG÷ dGdNG÷GdN0
d ÷ d?GdEG÷GdSGGd0G÷Gd00
$ [ < h * %+ -5 A ,N - ? '# +% J > @ Va h
& 5 > ! % % V ,3
D B & k > g * %+ J - R * > g * %+ J %& * k -o ] L '# +% 0 6 U +% Va +#
d0÷GdNGd3÷GdE
Gd ÷GdBGdB÷Gd0
d ÷ d0d?÷ d3
GdN÷ dGGdE÷ d
GdB÷Gd0GdB0÷Gd3
Trang 19%e ?0
G
G0
?G
GdN÷ dGdN÷ dGdE÷ d?
Gd0÷GdNGd3÷GdNGd3÷GdE
Gd ÷GdB
Gd ÷GdBGdB÷Gd0
dG÷ dB
d ÷ d0d?÷ d3
GdN÷ d
GdE÷ d
?GdE÷ d
?
GdB÷Gd0GdB0÷Gd00Gd0÷Gd3
Gd ÷GdBGdB÷Gd0GdB÷Gd0
dG÷ d3
d ÷ dNd?÷ dE
GdN÷ d
GdE÷ d
?GdE÷ d
GdB÷Gd0Gd0÷Gd3Gd3÷GdN
%e BG
0G
?G
GBG
GdS÷ d?
dG÷ d
dG÷ dB
Gd3÷GdEGdN÷GdSGdE÷GdS
GdB÷Gd0GdB÷Gd0Gd0÷dG3
Gd0÷Gd3Gd3÷GdNGdN÷GdE
%e 0G
3G
GBG
GdB÷Gd0GdB÷Gd0Gd0÷dG3
dG÷ dB
Gd00÷Gd3
Gd3÷GdNGdN÷GdE
Trang 20Gd?G÷Gd 0 Gd?G÷Gd 0 Gd?0÷GdBG Gd?0÷GdBG
Gd G÷GdB0
Gd 0÷0G GdBG÷G 3G
$
[ < h * %+ -5 A ,N J h \ ! 6p % % V 5 ! C
V ,3
q g * %+ - ? * > [ 4
Trang 21G
G0
Gd0G÷GdEGd0G÷GdEGd0G÷GdE
Trang 22D C
Trang 23δδδδ
d
Trang 24d BdGS
GdENGdS
GdN3GdEB
GdNGGdNS
Gd33GdN3
Gd3GdN
Trang 25, D > 8 % 7 C + V< > K + δ t @F ÷ @ > >
GGG SN?
Trang 26a≤Gd?
d G
?0 d G
3 d G a
%
€ N0G 1
?0 d G
3 d G a
%
€ BSG 1
δ
=
S d G 67 d G
?0 d G
3 d G a
%
€ N0G 1
3 d G f a
%
€ BGGGG
1 =
S d G 67 d G
?0 d G
3 d G a
%
€ N0G 1
Trang 288 w , $ & ' > 6 ? U I% *R
> @ Π > > - s L + @ Π > 9 > - s L + ' < @ ΠΠ > *7 - s L + @ Π > *7 9 - s L + ' < Πq *7 9 - s > L + I% A &
dD