. ( , . ) Q .7,. :
Q a =(4,3+8,7+10,6)*F/12=1,97*F=1,97*207,5=408,8 .
x 1 =1,4 ( = 1,05 ) :
11
Q 1 = *Q a =1,05*408,8=429 ;
1 = *Q a *0,8=1,05*408,8*0,8=343,4 ;
x 1 =1,4 .
Q x1 =1,05*(QA F) = 1,05*(408,8-207,5)=211,4 ;
x1 =1,05*408,8*1,4=601 *.
22
2 =1,04*(408,8*2 207,5*0,6)=727 ;
Q 2 =211,4 ;
m =( 1 + x1 + 2)/3=(343,4+601+727,7)/3=557 *;
Q m =(Q 1 +Q 2)/2=(429 + 211,4)/2=320 .
x 1 =1,4 :
( )
=( m /I x)*y c =(55 700/454 000) 60 = 7.36 /2 (73,6 ),
y c =0,5*120=60
=Q m /(h w *t w)= 320/120.1 = 2.67 /2 (26,7 ).
=( *F 1)/(t w *l ef)=(1,1*209)/(1*35,4)=6,5/ 2 (65)
=1,1- ;
F 1 =1,1*190=209 ;
l ef =c* =3,25* =35,4 ;
I bt I f -70 I f, I bt =I f +I r =7+1082=1089 4
I f =(30*1,4 3)/12=7 4
I f -
I 2 =1082 4 - -70.
/h w =2000/1200=1,67>0.8; = 6,5/7,36 = 0,88 *(b f /h ef)*(t f /t w) 3 =2(30/120)(1,4/ /l)3=1,37, =2 (. 22 II-23-81*).
d=1,37 /h ef =1,67 . 24 [ ] : [ ]=0,521, = 0,88. (81) :
=( 2 *R y)/ =(65,7*22,5)/,962 =94,3 /2 (943 ),
2 =65,7 . 25 /h ef =1,67; R y =22,5 /2 (225 );
(76)
=(10,3*(1+0,76/ )*R s)/ =10,3*(1+0,76/1,672)*130/3,962 = 109
( =/h ef =2000/1200 =1,67; d=h w =1200.)
=(d/t) =(120/1) =3,96;
(80) II-23-81* (/h ef)=1.25<2
=(c 1 *R y)/ =(36,2*225)/6,61 2 =184,6 , 1 =36,2no . 23 d=1,37 /h ef =1,67;
=(a/t w)* =(150/1)* =6,61.
(79) :
;
=0,5<1,
. . .
( ) , =5,4 (. 7, ). . , . 5, , .
|
|
Q :
33
Q3 = Q - F == 1,44 F - F = 0,44 F;
44 Q
Qx2 = Q4 = Q - 2 F == 1,44 F -2 F = - 0,56 F;
Q x2 = - 0,56*207,5 = - 116,2 .
, = l,05
Q m =
(. 7,):
3 =(Q a *4,8-F*1,3)=299*4,8 207,5*1,3=1165,5 *
x2 =(Q a *5,4 - F*1,9)=299*5,4 207,5*1,9=1220,3 *
M 4 =Q a *6 F*2,5 F*0,6=299*6-207,5*2,5-207,5*0,6=1150,7 *.
= l,05:
M m =(M 3 +M x2 +M 4)*1,05/3=1,05*(1165,5+1220,3+1150,7)/3=1237,8 *.
:
= m *y c /I x =123780*60/454000=16,4/ 2 (164);
=Q x2 /(h w *t w)=116,2/(120*1)=0,97/ 2 (9,7 );
= 65 .
/h w =2000/1200=1,67>0.8; d=1,37 /h ef =1,67 <2; =65/164=0,396, [ ]=0,521 ( . 24 II-23-81* d=1,37 /h ef =1,67), , (75) , (80); (75)
= cr *R y / =32,2*225/3,96 2 =462 .
=32,2 (. . 21 ) d = 1,37;
=3,96 ; (76) ,
. 7.8. (D=0,65 )
=(10,3*(1+0,76/ )*R s)/ =(10,3*(1+0,76/1,67 2)*130)/3,96 2 =109
( /h ef =2000/1200=1,67; h ef =1200 ).
(80) 0=0,5 =0,5*200 =100
=( 1 *R y)/ =15,9*225/3,3 2 =328,5
c1=15,9 no . 23 d=1,37 0/h ef =100/120=0,833;
=(a0/t w)* =(100/1)* =3,3
(8)
= =0,56<1
. . .
. , . (. 3.3) ( ):
[1/2*( *k f)]* ((Q max *S f /I x) 2 +( *F 1 /z) 2) R wt *
k f =6 (7.9)
[1/2*1,1*0,6]* =2,2 / 2 (22) Rwf =180,
Sf =30*1,4*60,7=2550 3; =1,1 d = 3 , z = 38,8 (c. -. ); =1; Q max =504,7 ; =1,1; =1.
.
. (. 8). 260*14 . A r =26*1,4=36,4 2.
|
|
:
=Q/A r; =504,7/36,4=139 < R p =336 R un =370
. :
A c =26*1,4+0,65*t w * =36,4+0,65*1* =56 2
I x =t n * /12=1,4*26 3 /12=2080 4;
i x = = =6,09 ;
=h ef /i x =120/6,09=19,7;
=0,965(. 72 II-23-81 *)
=Q/( *A s)= 504,7/0,965*56=9,34 /2 (93,4 ) <R y * =225 , =1.
, k f =8, :
l w 60*k f =60*0,8=48
=0,7-
=Q/(2* *k f *l w)=504,7/(2*0,7*0,8*48)=9,39/ 2 (93,9)
<(R wf * )=180*1*1=180
. . .
G ob = *A*l* =1,2*204*10 -4 *12*7,85=2,31 ,
=126*1+2*36*1,4=204 c2=204*10-4 2; =7,85 /3 ; =1,2 .
. . 9. 2123 2022 , 600750 (. 9,).
( ) 20 22 . 68 . . 4060 . .
.
1. . . ( . .., 6 .:, 1985 . 560.)
2. II-23-81. . . .: , 1988 .
3. 2.01.07 . .: , 1988 .
4. .., .. . .: 1986 312 .
. 9. ( 5 38071**)
, ; : , 42-; 1 5 ; 1 . Æ 25, Æ 22; 2 . Æ 23. Æ 20; 3, 5 Æ 22; 4 .
3, 5 0 22; 4