() . , . .
6
, 25, Qy Z
25 −
4 . , R , H RB :
1. ∑ = 0; (11)
, H = 0.
2. ∑ Y = 0; (12)
R − q ∙3+ RB − F = 0;
R + RB = 380.
3. ∑ B = 0; (13)
+ 6∙ R − q ∙3∙4,5 + M + F ∙2 = 0;
+ 6∙ R = 1310.
, , yB . , ( ), :
4. EI yB = 0; (14)
EI yB = EI y 0+ EI φ0 ∙ x + ∙62 /2 + R ∙63 /6 − q ∙64 /24 + q ∙34 /24 + ∙12 /2 = 0.
, y 0 = 0 φ0 = 0, y 0 − = 0, φ0 − = 0.
(14)
+ 2∙ R = 330.
(3) (4), :
,
- R = 245 , = − 160 H.
, (12) R , RB = 380 245 = 135 .
:
∑ m = −120∙3∙1,5 + 270 −135∙6 + 20∙8 = 0
,
. , R , RB,
.
26 : ,
|
|
Qy, Z, .
26 − .
Qy Z
.
7
h, b ( 27), [σ] = 160 , E = 2·105 h/b = 2. . 4, 3: . :
;
. (15)
27 −
4, 3: . :
;
. (15)
, , B :
. , y 0 = 0 φ0 = 0. :
(16)
(15) (16) : = 7,75 , mc = 7 ∙.
B:
,
= 4,25 .
28 − 9. Q,
M y
:
.
51, , .
:
; ;
;
.
( = 5 ):
51, . ,
, . D .
8