решения курсовых (семестровых) работ из задачника / Статика / c07_22
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.7. 22
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G = 5
= 20 b = 50
= 30
M X
X i = X A + X B - RC cos60 = 0
Yi = 0
Zi = Z A + Z B - G - RC sin 60 = 0
a + b + c |
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- RC sin 60 × b + Z B × (b + c) = 0 |
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= -G |
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- a |
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M Y = G × b |
+ RC sin 60 × b = 0 |
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M Z = RC cos60 × b - X B (b + c) = 0
RC - |
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G |
= - |
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5 |
= -2,89 |
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2 sin 60 |
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× sin 60 |
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X B = |
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RC cos60 × b |
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= - 2,89 × 0,5 × 50 = -0,9 |
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b + c |
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80 |
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RC sin 60 × b + G a + b + c |
- a |
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Z B = |
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b + c |
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Z B = |
- 2,89 × 0,87 × 50 + 5 × 30 = 0,3 |
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80 |
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Z A = G + RC sin 60 - Z B = 5 - 2,89 × 0,87 - 0,3 = 2,18 X A = RC cos60 - X B = -2,89 × 0,5 + 0,9 = -0,54
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, . :
a + b + c |
+ RC sin 60 × C - Z A × (b + c) = 0 |
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M X = G × |
2 |
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5 × 50 - 2,89 × 0,87 × 30 - -2,18 × 80 » 0
M Z = -RC cos60 × c + X A (b + c) = 0
2,89 × 0,5 × 30 - 0,54 × 80 » 0