.
. . γ = 20 /3. R 0 = 0,21 . , , 7 IV-IV, , .
7 : =154.63 .; N = 1338.92 ; Q = 29.32 .
1,2 10.2 :
G w3 =(g 1 h w1 + g 2 h w3)*B*γfγn=(2.15*1.2+0.4*9)*12*1.1*1=81.58 ;
:
G.. = G..*γf*γn=29*1.1*1 =31.9 ,
G.. , = .
4 = ½ (ϭ . + h) = ½ (0,3 + 1.1) =0.7.
:
.W. = (G w3 + G..) 4 =(81.58+31.9)*0.7=79.4 .,
:
= M- .W.= 154.63-79.4 = 75.23 ., N = N+ G w3 + G. =1338.92+81.58+31.9=1452.4 ; Q =29.32 .
d = 16 .
:
- 15, Rb = 8,5 ; Rbt = 0,75 ; γb = 1,0;
- 400; Rs= 355 .
:
) :
, ≥ h + 0,25, h ≥0,5 + 0,33 h1 =0.5+0.33*1.1=0.863
h ≥1,5 b1 =1,5*0.5=0.75 . h = 0,9 > 0,863 .
: , ≥ h + 0,25 = 0.9 + 0,25 = 1.15 ;
) , > h + 0,25
0,25 (0,2 ) (0,05 ).
() , Rs , :
h0, = = =75.85 ,
: As us , (As- 2,011 2 Ø16 ; us = π.d = 3,14.1,6 = 5,02 2).
Rbond , :
Rbond= η1.η2.Rbt = 2,5.1.0,75 = 1,875 .
:
h = α h0, = 0.75*75.85* .
: s, cal s,ef , ;
|
|
α , : α=0,75 .
0,3 h0, = 0,3.75,85 = 22,76 , 15ds = 15.1,6 = 24 200 .
: h = 0.24 , , = 0,24+0.25 = 0,49 < , = 1,15 .
. df = do √Mt = 1.1.0,23. √78.4 = 2.24 .
df.
= 2,15 ( 50 ), .. = 1,15 , = 0,49 .
d = + 1 =2.15+0.15=2.3 > df = 2.24 .
, d=2.3 , = 2,15