. 3.63.
As 1, l = 615, 8 2 (Æ 28), hl = 5 As,tot = 17 417 2 (14 Æ 32 + 10 Æ 28), sl st: sl = s 1, l (hl + 1) = 615, 8 (5 + 1) = 3695 2, 2.
, (7 Æ 32),
,
:
. 18 w = 0,698 xR = 0,523. 0,584 > xR = 0,523, (118).
:
. . .
. l 0 = 12 l 0/ b = 12/0,6 = 20 l 0/ h = 18/1,5 = 12, , . 3.51, , 0 a. h b b h, . . h = 600 .
, . 3.50, l 0 = 12 £ 20 h, . 3.64.
, , As,int = 4826 2 (6 Æ 32). = 5800 2> As,int = 4876 2 = 50 < 0,15 h = 0,15 600 = 90 , . 27 (. ). . 26 27 jb = 0,674 jsb = 0,77.
(120) j:
(119):
. . .
30. : 400400 ; l = l 0 = 6 ; 25 (Rb = 13 g b 2 = 0,9); A-III (Rsc = 365 ); - : Nl = 1800 ; Nsh = 200 .
.
, . 3.50, ea.
h /30 = 400/30 = 13,3 > = 10 , ea = h /30, . 3.64, N = Nl + Nsh = 1800 + 200 = 2000 .
. 26 27 Nl/N = 1800/2000 = 0,9, l 0/ h = 6000/400 = 15, = ' < 0,15 h, jb = 0,8 jsb = 0,858.
j = jsb = 0,858, (119)
a s < 0,5, j, (120):
RsAs,tot , :
|
|
RsAs,tot , :
2.
As,tot = 1018 2 (4 Æ 18).