Steel Design Ec3
-
Upload
gerry-roberts -
Category
Documents
-
view
20 -
download
6
description
Transcript of Steel Design Ec3
-
3
11 2006
1
Steel
3.
Steel 3 (
EN 1993.01.01:2005) . 2000,
2003 .
Steel , -
.
.
,
2003 .
,
. ,
FsdFRD
Fsd FRD .
.
:
1, 2 3.
3.
1 2.
, -
, -
.
2
,
3.
1
-
x x y y z z b h tw tf fy fu A Iy y yIz z zIT Iw Wpl Wpl,y y yWpl,z z zWel Wel,y y yWel,z z ziy iz E G Poisson
M Mi NED My,ED y yMz,ED z zVy,ED y yVz,ED z zTED NRD My,RD y yMz,RD z zNt,RD Vpl,RD Vpl,T,RD TRD Ncr,y y yNcr,z z zNcr,T Ncr,TF
2
-
1:
3
. -
1 , ,
,
. , -
( , ,
) .
3.1
1 -
:
:
. ,
O-X -
O-Y .
,
. .
.
: ( 3, -
. 0.50
1.00. 0.67 1.00)
: 1.00 :
.
3
-
, : 0.50
, - : 0.85
, : 1.00
, : 1.00
, - : 2.00
-
.
.
, x ,
L/x.
.
:
. Steel
-
,
, .
. ,
-
-
.
.
. -
.
-
.
.
-
3
.
, -
. ,
, -
.
.
errordia.xxx xxx
.
.
.
.
4
-
2:
3.2
, 2.
.
-
:
By yMBy yBz zMBz zLy y (m)Lz z (m)C1 < 0
, = 0 C1 6.6 , > 0 C1 .
3.3
, 3
-
(
8)
:
. ,
.
5
-
3:
.
.
.
.
.
.
.
.
.
. -
, .
. ,
.
,
==>2 IPBl600
-
3.4
, -
( ) .
. , -
Steel.
4
Steel
( ).
: Nt,ED Nb,ED Vy,ED Vz,ED My,ED Mz,ED Tt,ED. Steel .
.
, 2000 2003,
-
X(X1, X2, X3) Y (Y1, Y2, Y3).
X1 = YKB + 0.1LyX2 = YKB 0.1LyX3 = YKBY1 = XKB + 0.1LxY2 = XKB 0.1LxY3 = XKB 9 :
1 X1, Y1, Z2 X1, Y2, Z3 X1, Y3, Z4 X2, Y1, Z5 X2, Y2, Z6 X2, Y3, Z7 X3, Y1, Z8 X3, Y2, Z9 X3, Y3, Z 10 , : MY ,
MY , MZ , MZ , N , M , QY , Qz
, Qz , QY .
, 10
:
1
MY Max, MY , MZ , MZ , N , M
, QY , Qz , Qz , QY
2
MY , MY Max, MZ , MZ , N , M
, QY , Qz , Qz , QY
7
-
...
10
MY , MY , MZ , MZ , N , M ,
QY , Qz , Qz , QY Max
10 9
90 .
01-10 1 Max
11-20 2 Max
...
81-90 9 Max
, 1,
(1 9)
.
57 : 6 =(5+1)=X2, Y3, Z
7 MY , MY , MZ , MZ , N
, M , QY Max, Qz , Qz , QY
5
. Steel
-
1.
2000 2003, Steel
2000,
.
, ,
1.01 + 1.02 + 11 2 ,
2000 .
. ,
2000.
3 10 ( ).
6
, ,
1,2 3
.
, Steel
Steel.
8
-
Steel , , 4.
4, Steel
3.
6.1
: 1993.1.1:2005
6.2.3Nt,RD =
AfyM0
(1)
Steel . ,
.
6.2
:
Nc,RD = min{Npl,RD, Nb,RD} (2)
1993.1.1:2005
6.2.4Npl,RD =
AfyM0
(3)
Nb,RD =AfyM1
(4)
=1
+2 2
1.0
= 0.5[1 + ( 0.2) + 2]
=
AfyNcr
=Lcri
1
1
1 = pi
E
fy
6.1 6.2 3. Lcr Steel .
,
. 1993.1.1:2005
6.3.1.4 -
( 4) -
1,2 3 :
=
AfyNcr
(5)
9
-
Ncr = Ncr,TF
Ncr Ncr,T
:
Ncr,T =1
i2M(GIt +
pi2EIwL2T
) (6)
:
i2M (Ncr,TF Ncr,z)(Ncr,TF Ncr,y)(Ncr,TF Ncr,T )N2cr,TF z
2
M (Ncr,TF Ncr,y)N2cr,TFy2M (Ncr,TF Ncr,z) = 0 (7)
i2M = i2
y + i2
z + y2
M
.
zM , yM .It, Iw .LT LT = L , LT = 0, 5L .
0, 2 Npl,RD( 6.3.1.2(4) 3)
6.3
: 1993.1.1:2005
6.2.6
Vpl,RD =Av(fy/
3)
M0(8)
Av : ( 6.2.6(3) 3) A 2btf + (tw + 2r)tf 6< hwtw 2btf (tw + 2r)tf U A 2btf + (tw + r)tf 0, 9(A btf )
Ah/(b+ h) Ab/(b+ h) 2A/pi A
Av = siA si yy zz Steel. sy = sz = 0.8.
Vpl,RD Vpl,T,RD
10
-
Vpl,T,RD =
1 t,ED
1.25(fy/3)/M0
Vpl,RD (9)
U
Vpl,T,RD =
[1 t,ED
1.25(fy/3)/M0
w,ED(fy/
3)/M0
]Vpl,RD (10)
Vpl,T,RD =
[1 t,ED
(fy/3)/M0
]Vpl,RD (11)
6.4
-
:
TRD =
(1
4
i
bit2
i
)(fy/
3
M0
)(12)
bi ti i. 1993.1.1:2005
6.2.7
6.5
y y z z, .
: 1993.1.1:2005
6.2.5, 6.2.8 VED 0.5Vpl,RD 1 2
Mc,RD =Mpl,RD =WplfyM0
(13)
3
Mc,RD =Mel,RD =WelfyM0
(14)
VED > 0.5Vpl,RD
1 2
Mc,RD =Mpl,RD =Wpl(1 )fy
M0(15)
3
Mc,RD =Mel,RD =Wel(1 )fy
M0(16)
11
-
:
=
(2VEDVpl,RD
1)2
=
(2VEDVpl,T,RD
1)2
= 0 VED 0.5Vpl,T,RD
6.6
. -
,
. Steel
.
: 1993.1.1:2005
6.3.2.1Mb,RD = LTWy
fyM1
(17)
:
Wy =Wpl,y 1 2Wy =Wel,y 3LT - :
LT =1
LT +2LT 2LT
1.0
LT = 0.5[1 + LT (LT 0.2) + 2LT ]
LT =
WyfyMcr
LT 6.3 6.4 3. Mcr () :
Mcr =C1pi
2EIzK2
IwIz
+K2pi2
GITEIz
C1 3.2 :
C1 = 1.132 C1 = 1.0K2 = (KL)
2 K = 1.0 L .
12
-
7
7.1
:NEDNt,RD
1.0 (18)Nt,RD 1
7.2
:NEDNc,RD
1.0 (19)Nc,RD 2
7.3
:
VEDVpl,RD
1.0 (20)
Vpl,RD 8
Vpl,T,RD 9 10 11
VEDVpl,T,RD
1.0 (21)
Vpl,T,RD : (
VEDVpl,RD
)2+TEDTRD
1.0 (22)TRD 12
7.4
:
TEDTRD
1.0 (23)
TRD 12
7.5
(
. 6.6 :
MEDMb,RD
1.0 (24)
Mb,RD 17
13
-
7.6 ,
:
NEDNRD
+My,EDMy,c,RD
+Mz,EDMz,c,RD
1.0 (25)
NRD 1, 2My,c,RD,Mz,c,RD 13 14 - 15 16 .
7.7 ,
: 1993.1.1:2005
6.3.3NEDyNRkM1
+ kyyMy,ED
LTMy,RkM1
+ kyzMz,EDMz,RkM1
1.0 (26)
NEDzNRkM1
+ kzyMy,ED
LTMy,RkM1
+ kzzMz,EDMz,RkM1
1.0 (27)
:
y, z .LT .kyy, kyz, kzy, kzz . - .
NRk Mi,Rk :
1 2 3
Ai Wy Wpl,y Wpl,y Wel,yWz Wpl,z Wpl,z Wel,z
NRk = fyAi,Mi,Rk = fyWi
8
, -
. , .
. 18
. 19
Y , Z. 20
Y , Z. 25
. 23
. 26 27
. 24
14
-
4:
. 25
. 25
. 25
. 25 -
9
:
Vpl,RD 6.3.
Mc,RD 6.5.
- .
.
.
,
.
, .
10
Steel : .
4 .
. -
: ,
15
-
5:
(),
(.), (-), -
(max),
(By Bz Ly Lz), () -
() ,
() * .
.
m kN kNm. ,
-
menu Steel.
Steel.
16
-
11
1. EN 1993.01.01: 3: -
- 1-1: .
2. . : . . -
2003
3. ., ., .:
. 2006
4. ., ., .: . -
3. . 1999,2000
5. (): . -
1-4. . .
17