1
: . .
: - .
_____
2 :
ΣFix=0;____________________________________________________________
__________________________________________________________________
__________________________________________________________________
ΣFiy=0.____________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
- :
1 :
1.3-
2 :
________________________________________________________________
________________________________________________________________
________________________________________________________________
__________________________________________________________________
: R1=__________; R2=___________.
- 1
2
: . .
: . .
_____
:
1. , .
2. :
Σ(Fi)=0;______________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
_______________________________________________________________
Σ(Fi)=0;______________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
3. :
:
ΣFiy=0.____________________________________________________________
________________________________________________________________
|
|
|
0=0
.
: R=__________; R=___________.
- 2
:
: , .
_____
:
1 :
____________________________________________________________________ :____________________________________________________
2 , , 8509-86, 8510-86, 8239-89, 8240-89 ( , - ):
__________________________________________
2.2
:
2.1- :
| , 2 | i; | i; | zi; | Ai x i; c3 | Ai i; c3 | ||
3 :
____________
____________
____________
____________
____________
____________
: =________ ; =_______ _. (_____;_____)
- 3
: .
: :
) Nz σ;
) () , =2·105 ;
) n, __________________ σ_____.
_____
:
) Nz:
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
σ :
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Nz σ.
3.2 Nz σ
) ( ) ∆ℓ:
:
____________________________________________________________
__________________________________________________________________
____________________________________________________________
__________________________________________________________________
__________________________________________________________
|
|
|
__________________________________________________________________
() :
__________________________________________________________________
) :
__________________________________________________
:____________________________________________________________
__________________________________________________________________
__________________________________________________________________
- 4
: .
: :
) ;
) ;
) .
____
4.1
:
) :
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
, , :
_ 1-1: __________________________________________________________________
_ 2-2: __________________________________________________________________
_ 3-3: __________________________________________________________________
_ 4-4: __________________________________________________________________ _____________
. ( ), - .
4.2
) τ = /W ≤ [τ]
Θ0 = M /GJP ≤ [Θ0] ( ) :
W ≥ M /[τ]; W = πd3/16≈0,2d3;
__d1 =____________________________________________________________
_____________
_____________
_____________
J ≥ MK /G[Θ0]; J =πd4/32≈0,1d4;
G ; G = 8∙104 ( )
__d1 = _____
____________
____________
____________
____________
. :
d1 =_____; d2 =_____; d3 =_____
)
4.3
: __________, d =_______.
