f 1 = 2 кН
Post on 31-Dec-2015
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aF1= 2F2= 5 . .
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ABCDEG123456789
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, , . .
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. , .
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aF1= 2F2= 5ABCDEG123456789XA+F1= 0XA = F1 = 2 ()(-2) 2YA F2 + YB= 0 F1a F2 2a + YB 3a = 0(4)4YA = F2 YB = 5 4= 1()1(1)
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aF1= 2F2= 5ABCDEG123456789(-2)(4)(1)
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: , .aF1= 2F2= 5ABCDEG123456789(-2)(4)(1)
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EaF1= 2F2= 5ABCDG123456789(-2)(4)(1)XAa YA 2a + YB a= 2 a 1 2a + 4 a = 0 :
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, .
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, .EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) - , - , . :
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, . - , - , . :EaF1= 2F2= 5ABCDG123456789(-2)(4)(1)
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- , - , . : , .EaF1= 2F2= 5ABCDG123456789(-2)(4)(1)
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EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) :+ ( ); . .
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EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) :yYB = 4x S8 S9 cos 450 = 0 ; YB + S9 sin 450 = 0 .
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YB sin 450 S9 cos 450 EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) :YB = 4xy S8 S9 cos 450 = 0 ; YB + S9 sin 450 = 0 .(2) => S9 = = 4(1) => S8 == 4 ().
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2 2EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) :YB = 4xy S8 S9 cos 450 = 0 ; YB + S9 sin 450 = 0 .(2) => S9 = YB sin 450= 4(1) => S8 = S9 cos 450 = 4 2 = 4 (). 4 4
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:EaF1= 2F2= 5ABCDG123456789(-2)(4)(1) :y4
123456789,
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= 4 (); :4 x S6 + S9 cos 450 = 0 y=> S6 =S9 cos 450 S7 S9 sin 450 = 0 => S7 = S9 sin 450= 4 (). 4 4 44
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4 44 D
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4 44(4) D :S7 = 4xS8 = 4F2 = 5y 33
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4 44(4)2 3 C
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4 44(4)3 : 30 30
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:4 44(4)3 30
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4 44(4)3 30 :
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4 44(4)3 30 : : XA + S1+ S2 sin 450 == 2+ 3= 0
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4 443 30 :
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x4 443 30 : G:S3 = 0S6 = 4F1 = 2y F1 + S6 S2 cos 450 + S5 cos 450 = S2 sin 450 S5 sin 450 = = 0
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