, , , , , .
1.
l (.6.17). = 4 , l = 2 .
.6.17
, . .
.
.
N - z, - y yz . .6.17 .
. ,
, ,
, , ,
, , .
, N , .
Qy Mx .
Qy = P = 4 . z.
z. : z = 0 z = l = 2 .
z = 0 ( = 0);
z = 2 ( = 8 ).
.
Qy Mx . Qy Mx , .. .
, . .
, . .
2.
(.6.18).
. 6.18
.
1. .
2. .
.
3. .
, , ( ). .
3.
, (.6.19).
.
.
1. .
2. .
3. .
, , , , . , z , , , , .
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:
. 6.19
.
4. , :
.