, , l = 9 , .
:
qr = br hr g b g f = 0,3×0,9×25×1,1= 7,425 / ,
br, hr (. 1.5);
γ b = 25 / 3 ;
γ f = 1,1 (. 2.1).
:
q = (P 0 l + qr)×g n = (8,291×9 + 7,425)×0,95 = 77,941 / .
[8], :
4 : | , |
4 : | M 21 = M 23 = 0,085 qL 2 = 0,085×77,941 ×(9)2 = 536,62 × , |
4 : | M 22 = 0,055 qL 2 = 0,055×77,941 ×(9)2 = 347,22 × , |
4 : | M 32 = 0,065 qL 2 = 0,065×77,941 ×(9)2 = 410,35 × . |
(. 2.2,):
QA = Qq + QM, QB = Qq QM,
:
Qq :
;
QM :
.
4 :
, ,
Q 12 = + (- 58,81) = 296,79 , Q 21 = (- 58,81) = 414,41 .
4 :
, ,
Q 23 = + = 364,76 , Q 32= = 336,7 .
; :
,
h : h = 450 (. 1.4).
1-
, . , . 1- ( . 2.2, ).
, L ´ l, .
4 :
,
n = 5 (. 1.1); H = 4,2 ; hk .
4 :
Gk = Gk,n ×g f = 106,31×1,1 = 116,94 .
1- :
4 :
Nk,n = Gk,n + L × l ×[ P 0, n ×(n 1) + P 1, n ] =
= 106,31 + 9×9×[7,07×(5 1) + 5,30] = 2826,3 .
4 :
Nk = g n ×(Gk + L × l ×[ P 0 ×(n 1) + P 1]) =
= 0,95×(116,94 + 9×9×[8,291×(5 1) + 6,513]) = 3164,2 .
|
|
3.
4 40 ( ), .
4 Rb = 22,0 (. 13 [2]).
4 , γ b 2 = 0,9 (. 15 [2]).
4 , -VI (1000) .
:
Rsn = 980 (. 19* [2]),
Rs = 815 (. 22* [2]).
4 -I (500).
Rs = 410 (. 23* [2]).