. ho = h ¾ = 400 ¾ 58 = 342 . , . 4.1, , .
ss. (263), ss :
, (262) dn:
:
ss = 273×1,08 = 294.
(249). , 0,02. . 4.7, d = 1,0; h = 1,0; d = 22 .
acrc2 = 0,3 .
54. : h = 300 , b = 1150 ; a = 42 ; 15 (Rbt,ser = 1,15 ; Eb = 2,05×104 ); A-III (Rs = 365 ; s = 2×105 ); s = 923 2 (6 Æ14); Ml = 63 ×, Msh = 4 ×; u = 80,5 ×; .
.
. ho = h ‑ = 300 ‑ 42 = 258 . . 4.5. Mcrc.
Mcrc , (246):
Mcrc = Rbt,serWpl = 0,292 bh2Rbt,ser = 0,292×1150×3002×1,15 = 34,75×106 × = 34,8 ×.
Mr = tot = Ml + sh = 63 + 4 = 67 × > Mcrc = 34,8 ×, .
, , . 1, . 4, acrc2 = 0,3 , . 4.6, Ml.
(249).
ss (263):
, (249), : d = 1,0; h = 1,0; d = 14 ,
acrc2 = 0,3 , acrc . 4.8. . a2 = = 42 < 0,2 h = 0,2 × 300 = 60 , acrc, . 4.8, .
(256) , :
Mo = Mcr + ybh2Rbt,ser = 34,8×106 + 0,454×1150×3002×1,15 = 88,8×106 × = 88,8 ×.
= 88,8 × > Mr = 67 ×, jb (253):
jl1 = 1;
jb = jf1jl1 = 0,79 < 1.
jb, acrc = 0,34×0,79 = 0,269 < 0,3 , . . .
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55. : h = 500 , b = 400 ; a = a¢ = 50 ; 15 (Rb,ser = 11 ; Rbt,ser = 1,15 ; Eb = 2,05×104 ); A-III (s = 2×105 ); As = A¢s = 1232 2 (2 Æ28); N = Nl = 500 ; Mtot = 240 ×, Ml = 150 ×.
.
. ho = h ‑ a = 500 ‑ 50 = 450 . . (233). , . 4.2, Wpl . (246),
Mcrc = 0,292 bh2Rbt,ser = 0,292×400×5002×1,15 = 33,6×106 ×.
r (241). sb ( ):
j = 0,7;
.
(238) Mr:
. . (233) . , .
. 4,6 . . 4.10 Ml Nl (249). (264) ss.
jf = 0,074, ma = 0,067 . 30 jcrc = 0,33.
. 4.7, s = 1,0; h = 1,00;
ss (264).
jf = 0,074, ma = 0,067 jcrc . 30 0,522.
, (265),
acrcl = 0,4 (. . 1, . 4).
56. : l = 5,5 , : v = 30 / g = 12,5 /; b = 200 , h = 400 , h = 370 ; 15 (Rbt,ser = 1,15 ; Eb = 2,05×104 ); -I (s = 2,1×105 ) s = 150 , 8 (4sw = 101 2).
.
. , (248).
:
. 21, jb3 = 0,6.
jb3Rbt,serbho = 0,6×15×200×370 = 51060 H < Qmax = 117 ,
. . .
. 4.11. Q Qb1.
q1 = g + v /2 = 12,5 + 30/2 = 27,5 /;
jb4 = 1,5 (. . 21).
0,2 jb4Rbt,serb = 0,2×1,5×1,15×200 = 56,9 / > q1 = 27,5 /, Qb1 Q = 2 h = = 2×370 = 740 .
Q = Qmax ¾ q1s = 117 ¾ 27,5 0,740 = 96,65 .
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(267):
. 4.7 4.11, jl = 1,5; h = 1,3; dw = 8 .
(266):
rc = 0,3 (. . 1).