Ngày tải lên :
25/04/2013, 08:54
... )
2
2
2
3
2
6
.85,0
.1
5,0
10 .05 ,1
nb
NKi
ibL
tx
+
−
=
σ
(S
1
CT
3 -15
T
45
)
( )
( )
5,225
584.37.85,0
15 ,7 .11 ,11 5.2
5,237.5, 012 1
10 .05 ,1
2
3
26
1
=
+
−
=
tx
t
σ
N/mm
2
( )
( )
35 ,14 6
14 60.37.85,0
525,7 .11 ,11 5.2
5,237.5, 012 1
10 .05 ,1
2
3
26
2
=
+
−
=
tx
t
σ
...
1, 16
365 ,19 145
58,308348
==
W
M
u
τ
a
=
2
/1, 14
73,38290
63,539498
mmN
W
M
o
x
==
=> n
σ
=
8 ,15
78,0.9 ,1
1 ,16 . 51, 1
260
.
1
==
+
−
ma
k
σψσ
βε
σ
σ
σ
σ
n
τ
=
47 ,11
67,0.90 ,1
1 ,14 .18 ,1
150
... hãû säú táûp trung æïng suáút:k
σ
= 1, 51 ; k
τ
=
1, 18
+ Ta coï:
=> n
σ
=
71, 13
78,0.9 ,1
65, 21. 51, 1
260
.
1
==
+
−
ma
k
σψσ
βε
σ
σ
σ
σ
n
τ
=
71, 13
9 ,1. 67,0
11 .18 ,1
150
.
1
==
+
−
ma
k
τψτ
βε
τ
τ
τ
τ
=...