Post on 06-Feb-2018
2005
1 : : ) , Q, N (3.5 ) ) 7 (1.5 ) 20 oT = C: 8 22 10E kN m= 480000, cm= , 510 / oTa C
=I
:
8 22 10E kN m= 4 380000 0.8 10, 4cm m= = 2160000, I kNm= I E . , . . , ( ).
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1
2005
:
1.5tan 26.5653.0
o = =
7 3 30 6 130 3 45 6 0 110M V V= = = kN 7 70 45 131 45 110 0 110yF V V= + = = kN
#8:
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2
1 20xF S= = S 30 90yF S= = kN
#9:
4 50xF S= = S
4 40 2 sin 130 145.34yF S S= = = kN 4 5 145.34S S kN= = ()
#7 ( #8):
1 10 145.34cos 0 130xF S S k= + = N 1 2 130S S kN= = ()
: 0 145.34sin 64.9979 65yF k= = N kN
2005
:
1 20 80 cos 45 0o
xF V H= + = (1) 1 2 1 20 sin 45 30 10 110 0 sin 45 410
o oyF V V V V= + = + = (2) 1 2 20 8 80 3 30 10 5 110 10 0 355M V V= = = kN (3)
(2) (3) : 1 77.78V k= N (4)
(1) (4) : 2 135H k= N
: 2 0 80 3 77.78cos45 8 110 2 30 10 3 0.0098764 0
oM = + + =
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3
2005
[]
245 33.75
8ql
= , 256 93.75
8ql
= ,
267 15.00
8ql
=
[Q]
#5: 90 35 55 77.78sin 45o = = #6:
2185 170 355kN V+ = =
[]
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4
2005
(...) . : () 0T() ,
T0T
() . () ( ) .
71 1
1 i ii T T i ii ii i
M T Si TR M dx Ma dx Na Tdx S l S a dTdxEI h E A
= =
+ = + + + +
1
ii
i i i
SS ilE A=
1i T
iS a dTdx
=
. , #7 . ,
TTMa dh
x , . :
210 cos45oxF V H= = 0 1 20 sin 45 1oyF V V= + = 0
2 21 0 8 1 10 0 1.25M V V= = = kN : 1 0.35V k= N 2 0.25H k= N
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5
2005
[ M ]
[ N ]
: 71 i iR + 0
TMM dx Na TdxEI
=
= + ,
( ) ( )
( ) ( ) ( )
[ ] 3
15 1.25 2 248.75 6851 6
1 12 2 2 125 280 3 405 0.756 6
1 1433.229131231.77083 353.3333 151.8750 8.95768 10160000
MM dxEI EI
EI
=
+ +
= + = =
( )5 410 20 3 2 0.35 5 0.25 3 1.25 2.030151519 10TNa Tdx = + + = : 3 47 71 8.95768 10 2.030151519 10 8.075 0.81mm cm
= =
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6
2005
2 : M, Q, N (2.5 )
: (46) (47) . #4 (24) (45). #6 #7 P. #6:
62 0S > 67 0S >
(: 62 75S S= #7)
#4:
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7
42 45S S=
(26), (57) (67) , (46) (47) . #5:
35 0S > ,
45 57 1 35 2cos cos 0S S S = +