Ngày tải lên :
08/01/2014, 17:40
... :
A
s
: 3Φ 25 + 3Φ 28 ( 33 ,2 cm
2
) ; A’
s
:2 Φ16 ( 4, 02 cm
2
)
2 2 2
2
0
6 3
2
h 40
J ( + ' )( a) (33 ,2+ 4, 02) ( 4) 9 528 , 32 cm
2 2
0,151 26 1,36 0,16
1 1 1.3568
117,83 319 ,28 0,16
6.4
0.11
0.1
0.1
6.4 ... 4100
P
max
P
max
P
max
P
max
6300
4400
y
1
y
2
1
6000
2 2 2
0
2
0
6 3
2
h 40
Jμbh ( a) 0. 025 8 40 36 ( 4) 9510,9 cm
2 2
0,151 26 1,36 0,16
1 1 1 .25 86
120 ,47 26 1,36 0,16
6.4
0.11
0.1
0.1
6.4 27 10 2, 133 10 0.11
0.1
9. 125 1 .25 86 0.1 ... Chọn 3Φ 25 + 3Φ 28 (As = 33 ,2 (cm
2
) )
'
4
0
(33 ,2 4, 02) 10
.100 2, 585% 3%
0.4 0.36
S S
A A
bh
µ
−
+
+ ×
= = = <
×
30
' '
4
2 2
4 2 2
( )
26 1,36 0,5 026 28 0000 4, 02. 10 0, 32
0.9...