300300 N = 2017 .
, g f =1,15; Nn = N / g f =2017/1,15 =1754 . R 0 = 0,28 , Hf = 1,4 .
25 (Rbt = 0,945 ) A-I (Rs = 225)
g mt = 2010-6 /3
Af,tot= 6,96 2.
a = = =2,64 .
a =2,7 , :
N / Af,tot = 2017103/27002 = 0,277 .
(.7) :
h 0 = = = 493 ,
.. H = h o + a = 493 + 50 = 543 .
H = 1,5 h + 250=1,5300 + 250 = 700 .
Æ32 A-III 25 H = lan d + 250 =2132+ 250 = 922 , lan [3. 45] [2 (186)].
H = 950 , , h 1 = 350 . h 0 = H a = 950 50 = 900 h 01 = 350 50 = 300 . , III-III. :
Q = 0,5 (a - hc - 2h0) b 0,5 (2700 300 - 2900) 10,277 = 83,1 .
Qb ,min = 0,6 Rbt b h 01 = 0,60,9451300 = 170,1 > Q = 83,1 , . I-I II-II.
[I, (XII,7)].
MI=0,125ps(a-hc)2b=0,1250,277(2700-300)22700=538,5106/;
MII = 0,125 ps (a - a1)2 = 0,1250,277(2700 - 1500)22700 = 134,6106 /.
:
AsI = MI/(0,9h0RS) = 538,5106/(0,9900225) = 2955 2.
AsII = MII/(0,9h01RS) = 134,6106/(0,9300225) = 2215 2.
14 Æ 18 A-I (As = 3562 2).
:
3562100/1500900 = 0,26%;
3562100/2700300 = 0,44%, = 0,05%.
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1. ..., .. . . .: 1985.
2. 2.03.01-84. . .: , 1985.
3. ( 2.03.01-84). .: , 1986.
4. ( 2.03.01-84). .1. 1986.
5. ( 2,03,01-84). .2. 1986.
6. II-22-81. . .: 1983.
7. 2.01.07-85. . . 10. . .: , 1989.
8. 2.02.01-83. .
9. . . -. 4- /, 1990.