, .
, , .
. . .
, , , . (Nz, Qx, Qy) (Mx, My, Mz) , (. 1.1).
Σ Fz = 0: Þ Nz ;
Σ Fy = 0: Þ Qy ;
Σ Fx = 0: Þ Qx ; (1.6)
Σ mx = 0: Þ Mx ;
Σ m = 0: Þ My ;
Σ mz = 0: Þ Mkp .
, , (. 1.2).
(): Nz;
: Qy, Qx;
: Mx , M;
: M.
. ∆ F F . ∆ R (. 1.3). ∆ R ∆ N ∆ Q :
.
= sz .
= t .
/2=
, , , .
, , , . .
, F (. 2.1). dF, , ; ρ - .
:
(2, 2) .
(3, 3) .
|
|
(4, 4) .
(4, 4) .
(4, 4) .
Ix, Iy, Iρ , x, y, ρ .
Ixy , , .
Wx, Wy (3) .
ix, iy () .