Mp . , X 1, X 2, , Xn Mp , .
Qp Np .
. Mp `Mi 0. . , D ip Xi Xi , , , . , , (4.7), i j, :
Mp = Mp 0 + S j`Mj 0 Xj, (4.7¢)
(4.4) (4.6), :
D ip = S k ò(Mp`Mi 0/ EJ) ds = S k ò[(Mp 0 + S j`Mj 0 Xj)× (`Mi 0 / EJ) ] ds =
= S k ò(Mp 0× `Mi 0/ EJ) ds + S j [S k ò (`Mi 0× `Mj 0 / EJ) ds ] Xj =D ip 0 +S j d ij Xj = 0.
. Qp Np Mp , . , , , Mp, Qp Np. 4.3.
4.4. Mp . 4.5, 4.3.
. Mp (. 4.5, ) `M 10 `M 20 (. 4.5, , ) , :
D1 p = (Mp ´ `M 10) = (1/ EJ)[(1/2)×2×(1/7)×(1/3)×2+(1/2)×2×(3/7)×(2/8)×1
(2/3)×2×1] = 0;
D2 p = (Mp ´ `M 20) = (1/ EJ)[ (1/2) ×2×(1/7) ×2 (1/2) ×2×(3/7)× 2 +
+ (2/3)×2×(1/2)×2 (1/2) ×2×(1/7)×(2/3)×2 = 0.
, .
Qp Np Mp , , Mp .
, , .
. , .
1. , . , Mp Qp Np.
, , Mp , - .
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2. , . , `Mi 0 Mp 0, Xi. , , Mp (4.7).
, , .
3. , . `Mi 0 Mp 0 Mp (4.7). Xi .
1. D ip , , , i- Xi .
2. `Mi 0 , , Mp.
`M 10, , .
3. , D1 p = 0, D2 p ¹ 0, , , X 2, D2 p 0 d22.
4. , Mp `Mi 0, `Ms 0 = S i`Mi 0, , , D sp = (Mp ´ `Ms 0) ¹ 0.