.
380 / 220 .
220
.
, , , . . , , . , . 3,5 . .
.
, .
. . , 80 , 60 .
.
.
( ) .
.
1:
3-
q= 
(2,1)
- , , , = 72; Δu % - , Δu %=2,3
q= 
2
q=1,5 2.
: Δu= 
%
, .
Ip= 
; (2,2)
- ;
cos j-
U- ;
Ip<= I ( 4,6)
:
q>=q
q=1 2,( 4,1). .
31,5+21,5
2:
25=21*L25=2*36*28*1.1=1267.2
M26=P1*L26=2*36*7.2*1.1=570.24
M25>M26
M12=M25+3*P1*L12=1267.2+3*2*36*10*1.1=3643.2
M37=P1*L37=2*36*7*1.1=554.4
M38=P2*L38=500*2.4=1200
M34=2P1*L34=2*2*36*4.4*1.1=696.96
M38>M34>M37
M13=M38+(3P1+P2)*L13=1200+(1.1*3*36*2+500)*10=8576
|
|
|
M16=2P1*L16=2*2*36*10.5*1.1=1663.2
M13>M12>M16
M01=M13+(7P1+P2)*L01=8576+(8*2*36*1.1+500)*39=52786 =52.8
=S=52,8
:
q= 
(2,3)
- , , , = 12;
qc=2,5 2.
Δu % - , Δu %=2,3
Δu= 
.
q>= q ( II.2)
2,5 >= 1,0 - .
, .
:
Ip= 
;
32,5.
3:
M27=P1*L27=2*36*1.1*8=633.6
M25=3P1*L25=3*2*36*1.1*6.6=1568.2
M26=3P1*L26=3*2*36*1.1*2=475.2
M25>M27>M26
M12=M25+7P1*L12=1568.2+7*2*36*1.1*7.2=2138
M38=2P1*L38=2*36*2*1.1*9.4=1488.96
M39=P1*L39=2*36*1.1*2=158.4
M38>M39
M13=M38+3P1*L13=1488.96+3*2*36*1.1*3=2201.76
M14=2P1*L14=2*36*1.1*11.6=1837.4
M13>M12>M14
M01=M13+12P1*L01=2201.76+12*36*2*1.1*44=44019.36
:
q= 
qc=2,5 2.
Δu= 
=1.47%
. II-2 ,
q>= q
2.5 >= 1.0 2 - .
:
Ip= 
;
Ip<= I ( 4,6).
32,5.
4:
M45=P3*L45=20*1.1*6=132
M46=P3*L+P1*L=20*1.1*36+36*2*1.1*20=2376
M46=M47=M39=M38.
M46>M45
M34=M46+(5P3+6P6)*L34=5715+(5*20*1.1+6*36*2*1.1)*4=8056.4
M210=P3*L210=20*1.1*4=88
M211=P1*L211=2*36*1.1*2=158.4
M211>M210
M112=M211+(P1+P3)L212+(2P3+P1)*L112=158.4+(2*36*1.1+20*1.1)*6+(2*36+2*20)1.1*2=
=1011.4
M112<M13
M01=M13+(7P3+7P1)*L01=8056.4+(7*20+7*2*36)1.1*2=9472.8
q= 
qc=1.5 2.
Δu= 
.
q>= q ( II.2)
1.5 >= 1,0 - .
:
Ip= 
;
Ip<= I ( 4,6).
31,5.
:
:
q=
q= 
qc=1.5 2.
Δu= 
Ip= 
;
Ip<= I ( 4,6)
q>=q
31,5+21,5.
:
:
=3,8×(4,197+1,133+0,9504+0,708)=26,486 ×
Δu %
Δu = Δu % - Δu %;
Δu =2,5-1,83=0,67 %
. 4,4 =72 ( )
q:
q= 
2
42
Δu= 
. II-2
q>= q
4 >=1 2 ( II.2) .
:
Ip= 
;
- ;
U- ;
cos j- .
|
|
|
I= 
Ip<= I ( 4,6).
44.
:
:
=4,1×(108*30*1,1)=14,612 ×
Δu =2,5-0,328=2,2 %
. 4.4, =72 ( )
q:
q= 
2
42
Δu= 
. 4,1
q>= q
4 >=1 2 - .
:
Ip= ;
- ;
U- ;
cos j- .
I= 
Ip<= I ( 4,6).
44.
