1

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- ( ) - - 2 10

1 50 2 2 200 2

1 C2 x CWT C = CWT = 50 2 (Safety Factor) 2/3 3 4 = x 4 4 9 = x 9

1

= C2 x CWT

= 1 2 x 50

= 9/4 x 50

= 112.5 .

1 () 2 C2 x CWT22 x 504 x 50200 . 2/3 0.6 9 120 x 91080 .

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1. 3 2. 3 3. 3 10