решения курсовых (семестровых) работ из задачника / Статика / c01_29

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);

(Fi ) = 0;

q ×0.5× 22 - 2q ×0.5× 22 + P sin 30 × 4 - M = 0

M = q ×0.5× 22 - 2q ×0.5× 22 + P sin 30 × 4

= 1×0.5× 22 - 2 ×0.5× 22 + 25×0.5× 4 = 48 × .

);

X i = 0;

P sin 30 - X B = 0

X B = P sin 30 = 25×0.5 = 12.5 .

(Fi ) = 0;

q ×0.5× 22 - 2q ×0.5× 22 + P sin 30 × 4 - × 2 - M = 0

M = q ×0.5× 22 - 2q ×0.5× 22 + P sin 30 × 4

- × 2 = 1×0.5× 22 - 2 ×0.5× 22 + 25×0.5× 4 -12.5× 2 = 23 .

i

= 0;

P sin 30 - = 0

= P sin 30 = 25×0.5 = 12.5

.

i

= 0;

- q × 2 - 2q × 2 - P cos30 = 0

= q × 2 + 2q × 2 + P cos30 = 1× 2 + 2 ×1×1+ 25×0.5

» 27.651 .

3

(Fi ) = 0;

q ×0.5× 22 - 2q ×0.5× 22 + P sin 30 × 4 - × 2 + M = 0

M = -q ×0.5× 22 + 2q ×0.5× 22 - P sin 30 × 4 + × 2 =

= -1×0.5× 22 + 2 ×0.5× 22 - 25×0.5× 4 + 27.651× 2 » 7.301 .

: ):

M A

min = 7.301 ;

R = = 12.5 ; RB = = 27.651 .