.
[σ] = 200
4.
.
(. 12) :
Ø ;
Ø .
[σ] = 200
: = 3,4 b = 4,6 = 2,5 l = 13
= 10 ͷ
F = 12
q = 15 /
4.
q, / | , | , ͷ | , | |||
a | b | c | ||||
0.1 | 0.2 | 0.3 | ||||
-4 | 0.5 | 0.2 | 0.4 | 0.4 | ||
0.3 | 0.3 | 0.4 | ||||
0.5 | 0.1 | 0.2 | 0.2 | |||
-1 | 0.4 | 0.2 | 0.3 | |||
-2 | 0.5 | 0.3 | 0.5 | 0.2 | ||
0.5 | 0.2 | 0.3 | ||||
-1 | 0.4 | 0.2 | 0.4 | |||
-8 | 0.5 | 0.3 | 0.2 | 0.5 | ||
0.3 | 0.3 | 0.4 |
1) .
: R, RB .
3 .
1 .
2 .
3 .
:
Y
47 + 16 153,4 12 = 0
63 63 = 0
, .
2) .
4 .
.
, 1.
. 12.
, , .
, :
Q = RA qx1
,
0 ≤ 1 ≤
1 = 0
Q = RA = 47
1 = = 3.4
Q = 47 153,4 = - 4
Q.
47 / x = 4 / (3,4 x)
x = 3,13
:
= RAx1 qx12/2
4 .
1 = 0
= 0
|
|
1 = 3,13
= 473,13 153,132/2 = 73,6 ͷ .
1 = /2 = 1,7
= 471,7 151,72/2 = 58,2 ͷ
1 = 3,4
= 473,4 153,42/2 = 73,1 ͷ
Q .
3 .
D
≤ 2 ≤ l-b-c
:
Q = RA qa = 47 153,4 = -4
.
:
= RAx2 qa(x2 a/2) .
2 = = 3,4
= 473,4 153,4(3,4 - 1,7) = 73,1 ͷ
2 = l-b-c = 13 4,6 - 2.5 = 5,9
= 475,9 153,4(5,9 1,7) = 63,4 ͷ
, .
:
0 ≤ 3 ≤
Q = 0
:
M = -M = -10 ͷ
BD:
≤ 4 ≤ b+c
Q = RB = 16
= -M + RB(x4-c)
4 = = 2,5
= -10 + 16(2,5 2,5) = - 10 ͷ
4 = 2.5 + 4,6 = 7.1
= -10 + 16 (7,1 2,5) = 63,4 ͷ
Q . , = 73,6 ͷ
(8):
,
max ( ), ͷ; Wz , 3, Wz = 0.1 d 3 (d , )
[ σ ] .
(8) :
(10)
, :
d = 155
1. - (, )?
2. , ?
3. ?
4. - (, ).
5. - ().
6. .
1. , .. []: / .. , .. ; .: , 1989. 626 .
2. , .. []: / .. ; . , ., 1999. 592 .
3. , .. []: . 2 . . 1. / .. , .. ; . . . -; , 2003. 408 .