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12 (
10 12)
32
3.
2
()(3.+
+ 2)
. , 00
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,
()
00
333.33
30
200
0. 0. ()
3000
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205 246 163 20
500
=350500
E ()=50025 8
=454.5
(25 , 8 , 25 )
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+
=246 M= 0.134
=0.13420350454.5
=193.193289
=193.19
,
>M ,
(1.1, .6, 4562000)
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8/10/2019 Preliminary design of beam
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193.1910
= 0.87 500 A 454.5 5 0 0 A20350
B. M = 0.87 f A d
, ,= 1210.24 mm
.
=
..=0.1
,
M=()A()
16 13,
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, =412,
=0.446=8.92
,
(246193.19)106=(4128.92)A(454.545.5)
A= 316.892
,
C ,
()A= 0.87 A2
(4128.92)316.89= 0.87500 A2
A2 =300.11 2
,
A=A1+ A2=1210.24+300.11=1510.35
2
A=316.89 2
(1.2, .6, 4562000
16
(1.2, .6, 4562000)
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193.1910= 0.87 500
A 454.5 5 0 0 A20350
=205 ,
>M ,
F,
B. M = 0.87 f A d
, ,= 1205.59 mm
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.
=
..=0.1
,
M=()A(), =412,
=0.446=8.92
,
(205193.19)106=(4128.92)A(454.545.5)
A=71.62 2
(1.2, .6, 4562000
( 16 )
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,
C ,
()A= 0.87 A2
(4128.92)71.62= 0.87500 A2
A2 =67.83 2
,
A=A1+ A2=1205.59+67.83=1273.42 2
A=71.62 2
(1.2, .6, 4562000)
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M , A() =0.85 yf
bd
=0.85
500
500*350
=270.43
21273.42 2
(K)
325 216 (1874.745)
325 (1472.622)
(26.5.1.1, .46, 4562000)
26.5.1.2, .47, 4562000)
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A. 3.12.10.2
B 81101985 .
. F 40%
0.25
70%
0.15.
(26.2.3, .44,
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M= 0.87 f A d f Af b = 0.87 500
1874.745454.5 5001874.74520350
D 25 bd
d
fyL
4
87.0 =
mmLd 02.14166.12.14
2550087.0=
=
)2.16.1( =bdQ ,FD 60%
+= od L
V
ML 13.1
oL= 16 =16 25 = 400
=261.445
(26.2.1, .42, 4562000)
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= 163
= 2605.15 > = 1416.02
+
=
40010163
10445.261
3.1 3
6
dL
H, .
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M
F = 163 K
= = .
=1.025 /2
%
=
100
= ..*100=1.179%
= 20
M20 ,
= 0.656 /2
< ( 19, .73) I
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= 0.87
,= 2.8 /2
,> >
H
()**
D = =1.0250.656=0.37
/2
D =
**=0.37*350*454.5= 58857.75
8
58857.75=0.875002 .
( 20, .73) I 456:2000
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=337.69 ,
< >0.75 300 337.69
H =300 2 8
.
(26.5.1.5, .47) I 456:2000
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= 0.58 = 0.58 500 1510.351874.745
= =26 ( ) = 1,
F % = (
= .. = 1.178%
= 223.63 M= 223.63 % = 1.178%, =1.05
(.232.1, .37, 4562000)
(.23.2.1(),37, 4562000
( 4562000, (.23.2.1 (), .38, 6.
3)
( 4562000, (.23.2.1 (), .37, 5.3)
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M F
% =( =.. = 0.93% 0.93 % = 1.24
=1 , (
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,= 0.25 = 0.25 454.5= 113.63 /
M
, 2 8
@ 100 / 2 (.. 2
454.5=909 )
.
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