-
( )
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: ,
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__________ ____________ ..
() () ( ..)
____________________________________________
-
_____
II 2 _____________________
( )
: , . _______
:
1) .
: q = 9 /. : l= 9; a1 = 8,1 ; 2 = 3,6 ; L= 10 [] = 150 ; E = 2 ∙105 ; h = 2b;
, .
2) .
, , ω = 50 -1 N = 16 . : d1 = 70 ; d2 = 240 . : a1 = 0,08m; 2 = 0,10; 3 = 0,08. : Fr1 = 0,4F1; Fr2 = 0,4F2. [] = 60 . .
____ 2007.______ _______ 2007.______
_________________ .. _____________2007.
() ( ..) ()
| 充 | |
| . | 5-8 |
| . | 9-13 |
I. .
1. .
RA RB :
ΣMA = yB∙L qa 
-=0;
yB = (qa 
+)/ L (1)
yB= (295,245+9)/9=33,805
ΣMB = - -yA∙ L + qa1(L- 
)=0 (2)
yA = ( -qa1(L- ))/L (3)
yA= (-9+ 360,855)/9=39,095H
:
ΣFiy = yA + yB - qa =0,, .
, . : , AD, DB, . , Q . , 8 .
|
|
|
2.1.
Q .
, ( - ).
, , - . .
1: 1 = =9∙;
Q1 = 0 ;
2: 2 = = 9 ∙;
Q2 = 0 ;
3: 3 = = 9 ∙;
Q3 = - yB = -33,805 ;
4: 4 =+ yB (L- a1)
Q4 = - yB=-33,805 ;
5: 5 =+ yB (L- a1)
Q5 = - yB=-33,805 ;
6:
6 = + yB∙L-g∙L∙(L- a1 + a2) (4)
6= 9+304,245-364,5=-51,255 ∙;
Q6 = - yB +g∙L (5)
Q6=-33,805+81= 47,195 ;
3. .
, .
, - ,
- . .
CA N Z. , N , , .
:
Qz = yA - q∙z = 0 (6)
z = (yA - Qz)/q = (yA Q3)/q (7)
z=0
N :
z = yA∙z - q∙z 
(8)
z = 0 ∙;
