q = f (z) (. 5.5, ).
. 5.5
dz (. 5.5, ). dz q . y x, (. 5.5, ), :
Qy + q dz - Qy - d Qy = 0;
Mx + Qy dz + q dz × dz /2 - Mx - d Mx = 0.
, :
(5.4)
. (5.5)
(5.4) , q = const Qy , Mx - . - , .. q = 0, , Qy = const, Mx z.
, , Qy . , , Qy , Mx .