I ¾ ; II ¾
. . 3.74. , h b, x y. . Asx Asy. . 50 As 1, x = 0, nx = 0, As 0 = 804,3 2 (Æ 32), As 1, y = 314,2 2 (Æ 20),
2 (4 Æ 32 + 2 Æ 20);
2.
, . 3.63, , , : Asl = Asy = 1318 2; Ast = Asx = 605 2; h = 600 ; b = 400 .
;
0,534 < xR = 0,55, (117), = 0,74:
, y, : Asl = Asx = 605 2; Ast = Asy = 1318 2; h = 400 ; b = 600 ;
0,583 > xR = 0,55, (118), :
. 42, , , as = 0,2 as = 0,4. = 240/464,7 = 0,516 = 182,5/322 = 0,566 , , an 1 = 0,677, .
, .
39. : , ¾ 33; , h, Mx = 3330 ͷ , b, My = 396 ͷ; y .
.
. . 3.75. , , . 33, (131) 5847 ͷ,
, y, , , , . 3.63. , . 49, : h = 600 ; b = 2 215 = 430 .
Asl Ast:
2 (Æ 32); hl = 3;
2 (14 Æ 32);
Asl = As 1, l (nl + 1) = 804,3 (3 + 1) = 3220 2;
Ast = As, tot /2 Asl = 11 260/2 3220 = 2410 2.
. 18 w = 0,698 xR = 0,523.
Rbbh = 19 430 600 = 4902 103 H;
d 1 = a 1/ h = 0,083;
(117),
, b = 200 , h = 1500 .
. 44, , , as = 0,6 as = 1,0.
= 3330/4170 = 0,8 = 396/1029 = 0,385 , , an 1 = N/ (Rbbh) = 2500 103/(19 200 1500) = 0,44, .
|
|
, .
40. : b = 400 , h = 600 ; 25 (Rb = gb 2 = 1,1); A-III (Rs = 365 ) . 50; N = 2600 , h, = 250 ͷ , b, My = 200 ͷ; My .
, . 3.76 .
. , . 50. 5 h = 600 y b.
q y , , , , . .:
1 ¾ h, xi = x/h 0 i axi ayi i - .
xi ssi, ssc,u = 400 , w = 0,722 (. . 18):
, ssi > Rs = 365 , xi < xR = 0,55 (. . 18), ssi < Rs = 365 .
ssi < Rsc = 365 , ssi = 365 .
ssi
å Asissi.
x 1 = h = 600 , , :
Asi, | ayi, | axi, | ayi tg q + axi, | 1 = 600 | 1 = 660 | |||||
2 | (tg q = 1,8) | xi | ssi, | Asissi, H | xi | ssi, | Asissi, H | |||
804,3 | 0,882 | 210 | 168 900 | 0,971 | 297 | 238 877 | ||||
804,3 | 4,29 | 365 | 293 570 | 4,714 | 365 | 293 570 | ||||
314,2 | 0,645 | 43 360 | 0,71 | |||||||
314,2 | 1,54 | 365 | 114 683 | 1,692 | 365 | 114 683 | ||||
804,3 | 0,508 | 293 570 | 0,56 | 272 658 | ||||||
804,3 | 0,937 | 213 944 å Asissi = 26 280 H | 1,031 | 348 | 279 896 å Asissi = 648 080 H |
< b = 400 , :
2.
(154):
. . .
1 660 å Asissi (. ).
1 > h 1/tg q = 660/1,8 = 367 < b = 400 :
RbAb å Asissi = 16 120 100 + 648 080 = 2570 103 H = 2570 ͻ N = 2600 , (154) .
. :
Mxu = RbSbx å Asissi ( 5 xi) = 16 40 036 000 [238 877 (550 50) 293 570 (550 50) + 6284 (550 300) 114 683 (550 300)] = 933,9 106 = 934 ;
|
|
:
Mxu > Mx 1, Myu > My 1 .
41. : b = 400 , h = 600 ; = ¢ = 50 ; 25 (Rbt = 0,95 gb 2 = 0,9); , , A-III, 10 (Rsw = 255 ; Asw = 157 2), s = 400 ; Msup = 350 ͷ, Minf = 250 ͷ ; N = 572 ; ( ) l = 2,8 .
.
. h 0 = h a = 600 50 = 550 . . 3.31 . 3.53.
:
.
, , . .
jn:
= max, Qb = Qb,min = jb 3 (1 + jn) Rbtbh 0 = 0,6 (1 + 0,27)0,95 400 550 = 159,2 103 H < Q = 214 , . . .
qsw (55):
/.
(57):
(57) , Mb
0 0 = 2 h 0 = 2 550 = 1100 , Qsw = qswc 0 = 100,1 1100 = 110,1 103 .
(50):
. . .