, , . , , (. 9.5, ).
, , , .
, , . , - , - .. (. 9.5, , ) l1 = 6...8 . , . l2=5...7, l=1,5...3 . , , , 4.1. (1/12...1/20)l2, (l/8...1/15)l1, b = (0,4...0,5)h. , , 15 -I, B-I -II, -III.
. 9.5.
:
1 ; 2 ; 3 ; 4
■ . . , ly/lx>2, , (. 9.6, ). . , , . . 1 (. 9.5, , ) , . , (. . 9.6, ):
. 9.6.
l02 = l2b, ( ) l01=l10,5b.
, , , (. . 9.6, ). 20%. b=100 hf.
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, (4.33).
, , . hf=6...10 (. 9.6, ) (d≤5 ), hf>10 (. 9.6, ) . As ql /16, ΔAs, ΔM=ql /11-ql /16.
, , .
■ . , (g1 + v), bf (. . 9.5, , ), g2 q = (g1 + v)bf+g2.
20% : M1 = ql /11; =ql /14; M = ql /16; QA=0,4ql01; QB,l=0,6ql01; QB,r=Q = 0,5ql02, l0i , , (. 9.7, ).
. , [13]. , ξ = 0,35, h0 = 1,8 . : , b. . : ( QA) ( QB,l, QB,r).
, d1>0,5d, , 15d1. b = 400...600 , . , (. 9,7, ).
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■ . , ( ). , , , .
, . . , h0 = 1,8 ; h=h0+(6...8) , . , . 2...3 , (. 9.7, ). , . .
. 9.7. :
1 ; 2 ; 3
(. 9.7, ). , . , , , a = 2hs+b (. 6.3).
. (6.5)]
F ; h0 .