chapter_03 - C A I 3- 1 R = 0, M = 0 * * O X = 0 Y 0 = m (...

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C A I 静静 静静静静静静静静静静静
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静静静 静静静静静 静静静静静静静静静静静静静静 §3- 1 静静静静静静静静静静静静静静静静静 静静静静静静静静静静静静静静静 R M O * * , = = 0 0 X = 0 Y = 0 m F o = ( ) 0 静静静静 静静静静静 静静静静静
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静静静静静静 静静静静 X = 0 m F A ( ) = 0 m F B ( ) = 0 { 静静静静静 AB OX 静静静静静静静静静静静静静静静静静静静 静静静静静静静静静静静静静静静静静静静 静静 B A R 0 X α 静静静静 R cos α= 0 90 静静 R = 0 静静静静静静
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静静静静静静 静静静静 m F m F m F A B C = = = ( ) ( ) ( ) 0 0 0 静静静静 A静 B 静 C静静静静静静 { 静静静静静静静静静静静静静静静静静静 静静静静静静静静静静静静静静静静静静 静静静静静 静静静静静静静静静静静静 静静静静静静静 - - - - 静静静静静静静静静
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静 3- 2 静静静静 AB 静静静静静 A B C q P M=pa 2a 4a
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A B C 2qa P M=pa 2a 4a 静静静静静静静 AB 静静静静 y x Y B Y A X A 静静静静静静 X X A = = 0 0 , Y Y Y aq P A B = + - - = 0 2 0 , m aY Pa ap a q A B = - - - = 0 4 2 2 0 2 , 静静静 X Y P qa Y P qa A A B = = + = + 0 4 15 0 75 05 , . , . .
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静 3- 3 静静静静 A静静静静静静静静静静静 静静静静静静静静静 A静静静静静静 4KN 6KN 2. 5KN 5KNM B 30 0. 6 0. 2 0. 5 0. 7 A
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4KN 6KN 2. 5KN 5KNM B 30 0. 6 0. 2 0. 5 0. 7 A Y X X A Y A M A X = 0 4 6 2 5 30 0 + + + = . cos X A 静静静静 Y Y A = + = 0 2 5 30 0 , . sin m A = 0 - × - × - - × 4 12 6 0 7 5 2 5 30 14 . . . cos . + × + = 2 5 30 0 6 0
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This note was uploaded on 10/11/2011 for the course ENG 230 taught by Professor Chen during the Spring '10 term at Tianjin University.

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chapter_03 - C A I 3- 1 R = 0, M = 0 * * O X = 0 Y 0 = m (...

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