1 ¾ ; 2 ¾ ; 3 ¾
) , , , ; ;
) (Rb Rb,red) , gbc = 0,9 gbs = 0,8;
) w (15) (104) , , , ; (104) mxy.
bs .
. 3.67 3.68, h¢f = hf , b¢f = bf ¾ , , .
h, (. . 3.54), .
3.114. , (. . 5.91, 1- 2- ), . 3.6 . 3.57 3.60. rb,red gb, 0,9 1,0, . (, , ) gb = 0,65.
52. : - . 81; 30 (Rbc = 15,5 gb2 = 0,9; Rb,ser = 22 ); B20 (Rbs = 10,5 gb2 = 0,9; Rb,ser = 15 ); -III(Rs = Rsc = 365 ; Rs,ser = 390 ), s = 's = 4070 2 (4Æ36); -III, 8 (Rs,xy = 355 ) s = 70 , ; N = 3900 gf > 1,0 N = 3300 gf = 1,0, eo = 55 .
.