8-90
DESIGN CONSIDERATIONS FOR WELDS
Table 8-8
Coefficients, C,
for Eccentrically Loaded Weld Groups
=0°
Angle
Available strength of a weld group, <pRn or RnlQ, is determined with
Rn = eel01 (<P = 0.75, Q = 2.00)
lRFD
C
lIIill
P
= <pCIDI
II
Dlllill
=
ASD
PII
<pCCII
1
PII
lIIill= <pCCID
C
lIIi//=
QPII
CIDI
where
P = required force, Pu or Pa , kips
D = number of sixteenths-of-an-inch in the fillet weld size
I = characteristic length of weld group, in.
a = exll
ex = horizontal component of eccentricity of P
with respect to centroid of weld group, in.
C = coefficient tabulated below
C, = electrode strength coefficient from Table 8-3
(1.0 for E70XX electrodes)
I
QPII
lIIill= CCID
9x =al
pi
C.g.
l
xl
~~
kl
1.6
1.8
2.0
6.03
6.01
5.87
5.64
5.37
~
O.g( 1.0 Vl.2
6.59
8.26
6.56 7.11 8.22
6.41 6.94 8.02
6.16 6.68 7.72
5.86 6.36 7.37
9.37 10.5
9.32 10.4
9.11 10.2
8.77 9.83
8.39 9.42
11.6
11.5
11.3
10.9
10.5
12.7
12.7
12.4
12.0
11.5
4.60
4.07
3.60
3.20
2.87
5.08
4.50
4.00
3.57
3.20
5.55
4.94
4.40
3.94
3.55
6.03
5.39
4.82
4.33
3.91
7.01
6.30
5.67
5.13
4.66
8.00
7.24
6.56
5.97
5.46
9.00 10.0 11.0
8.19 9.16 10.1
7.47 8.40 9.35
6.84 7.74 8.65
6.29 7.15 8.04
2.30
2.09
1.91
1.63
1.42
2.59
2.36
2.16
1.85
1.61
2.90
2.65
2.43
2.08
1.82
3.22
2.95
2.71
2.33
2.04
3.56
3.26
3.01
2.59
2.27
4.27
3.93
3.64
3.15
2.77
5.02
4.65
4.31
3.75
3.31
5.82
5.40
5.03
4.39
3.89
6.64
6.19
5.78
5.07
4.50
7.50
7.01
6.56
5.79
5.15
1.25
1.12
1.01
0.926
0.852
1.43
1.28
1.16
1.06
0.973
1.61
1.45
1.31
1.20
1.10
1.81
1.62
1.47
1.35
1.24
2.02
1.81
1.64
1.50
J.;38
2.46
2.22
2.01
1.84
1.70
2.95
2.66
2.42
2.22
2.04
3.48
3.14
2.86
2.62
2.42
4.04
3.66
3.34
3.07
2.84
4.64
4.21
3.85
3.54
3.28
1.90
1.77
-1.37 1.66
2.25
2.10
1.97
2.64
2.46
2.31
3.05
2.85
2.68
0.1
0.2
0.3
0.4
0.5
0.6
0.7
k
0.8
0.00
0.10
0.15
0.20
0.25
1.86
1.86
1.83
1.76
1.66
2.23
2.28
2.25
2.18
2.07
2.69
2.78
2.73
2.63
2.51
3.25
3.30
3.23
3.11
2.96
3.80
3.83
3.75
3.60
3.42
4.36
4.37
4.27
4.11
3.90
4.92
4.92
4.80
4.61
4.38
5.47
5.46
5.33
5.13
4.87
0.30
0.40
0.50
0.60
0.70
1.55
1.33
1.15
0.999
0.879
1.95
1.69
1.46
1.27
1.12
2.36
2.07
1.79
1.57
1.38
2.79
2.45
2.14
1.88
1.66
3.23
2.84
2.49
2.19
1.95
3.68
3.24
2.85
2.52
2.24
4.14
3.65
3.22
2.85
2.55
0.80
0.90
1.0
1.2
1.4
0.783
0.704
0.639
0.538
0.464
0.996
0.896
0.813
0.684
0.589
1.23
1.11
1.00
0.845
0.729
1.48
1.34
1.21
1.02
0.883
1.75
1.58
1.44
1.21
1.05
2.02
1.83
1.67
1.42
1.23
1.6
1.8
2.0
2.2
0.408
0.363
0.328
0.298
0.274
0.517
0.461
0.415
0.378
0.347
0.640
0.570
0.514
0.468
0.429
0.775
0.691
0.623
0.567
0.521
0.924
0.825
0.744
0.678
0.623
1.09
0.970
0.877
0.800
0.735
~
2.6 ~:253 0.320 0.396 0.481 0.576 0.680 0.788 0.901 1.02
~
QPII
CCII
-
-
0
~ 3.0
lIIi//=
' - 1""
Note: Shaded values indicate the value is based on the
greatest available strength permitted by AISC Specification
Sections J2.4, J2.4(a), J2.4(b) and J2.4(c).
a
D
rr.rs
1.~( 1.28 .47
.235 0.297 0.368 0.447 0.535 0.632 0.734 0.839 0.950 1.0 1.19. )~7
F""" """
0.219 0.278 0.343 0.417 0.500 0.591 0.686 0.784 0.889 1.00"'" rlli
1.4
x 0.000 0.008 0.029 0.056 0.089 0.125 0.164 0.204 0.246 0.2~ 0.333 ~24 0.516 0.610 0.704 0.800
----
AMERICAN INSTITUTE OF STEEL CONSTRUCTION
8-90
DESIGN CONSIDERATIONS FOR WELDS
Table 8-8
Coefficients, C,
for Eccentrically Loaded Weld Groups
Angle = 0°
Available strength of a weld group, tPRn or RnlD., is determined with
Rn = eelD! (tP =0.75, D. = 2.00)
lRFD
PI/
Clllill
= tPCIDI
ASD
PI/
DilliN
= tPCCII
I
lIIil/
PI/
= tPCCID
D.P"
C,"i"
D
= CIDI
where
P =required force, Pu or Pa, kips
D =number of sixteenths-of-an-inch in the fillet weld size
I = characteristic length of weld group, in.
a = ex/I
ex =horizontal component of eccentricity of P
with respect to centroid of weld group, in.
C =coefficient tabulated below
C, =electrode strength coefficient from Table 8-3
(1.0 for E70XX electrodes)
r- " '- ;1
-
(
k/
k
~
0.9 ( 1.0 ~1.2
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.00
0.10
0.15
0.20
0.25
1.86
1.86
1.83
1.76
1.66
2.23
2.28
2.25
2.18
2.07
2.69
2.78
2.73
2.63
2.51
3.25
3.30
3.23
3.11
2.96
3.80
3.83
3.75
3.60
3.42
4.36
4.37
4.27
4.11
3.90
4.92
4.92
4.80
4.61
4.38
5.47
5.46
5.33
5.13
4.87
6.03
6.01
5.87
5.64
5.37
6.59
6.56
6.41
6.16
5.86
0.30
0.40
0.50
0.60
0.70
1.55
1.33
1.15
0.999
0.879
1.95
1.69
1.46
1.27
1.12
2.36
2.07
1.79
1.57
1.38
2.79
2.45
2.14
1.88
1.66
3.23
2.84
2.49
2.19
1.95
3.68
3.24
2.85
2.52
2.24
4.14
3.65
3.22
2.85
2.55
4.60
4.07
3.60
3.20
2.87
5.08
4.50
4.00
3.57
3.20
0.80
0.90
1.0
1.2
1.4
0.783
0.704
0.639
0.538
0.464
0.996
0.896
0.813
0.684
0.589
1.23
1.11
1.00
0.845
0.729
1.48
1.34
1.21
1.02
0.883
1.75
1.58
1.44
1.21
1.05
2.02
1.83
1.67
1.42
1.23
2.30
2.09
1.91
1.63
1.42
2.59
2.36
2.16
1.85
1.61
0.408
0.363
1b 0.328
"1:2
~:298
2.4,...; .274
0.517
0.461
0.415
0.378
0.347
0.640
0.570
0.514
0.468
0.429
0.775
0.691
0.623
0.567
0.521
0.924
0.825
0.744
0.678
0.623
1.09
0.970
0.877
0.800
0.735
1.25
1.12
1.01
0.926
0.852
1.43
1.28
1.16
1.06
0.973
2.6
2.8
3.0
x
!
~~
0.1
-
c.g.
L-_~
0
1.6
1.8
D.P"
IlIIill= CCID
6x =al
..
Note: Shaded values indicate the value is based on the
greatest available strength permitted by AISC Specification
Sections J2.4, J2.4(a), J2.4(b) and J2.4(c).
a
D.P"
lIIi,,= CCII
1.6
1.8
2.0
rr.TS 8.26
7.11
6.94
6.68
6.36
8.22
8.02
7.72
7.37
9.37 10.5
9.32 10.4
9.11 10.2
8.77 9.83
8.39 9.42
11 .6
11.5
11.3
10.9
10.5
12.7
12.7
12.4
12.0
11 .5
5.55
4.94
4.40
3.94
3.55
6.03
5.39
4.82
4.33
3.91
7.01
6.30
5.67
5.13
4.66
8.00
7.24
6.56
5.97
5.46
9.00 10.0 11 .0
8.19 9.16 10.1
7.47 8.40 9.35
6.84 7.74 8.65
6.29 7.15 8.04
2.90
2.65
2.43
2.08
1.82
3.22
2.95
2.71
2.33
2.04
3.56
3.26
3.01
2.59
2.27
4.27
3.93
3.64
3.15
2.77
5.02
4.65
4.31
3.75
3.31
5.82
5.40
5.03
4.39
3.89
6.64
6.19
5.78
5.07
4.50
7.50
7.01
6.56
5.79
5.15
1.61
1.45
1.31
1.20
1.10
1.81 2.02 2.46 2.95
1.62 1.81 2.22 2.66
1.47 ~ 2.01 2.42
1.50 ' ~.84 2.22
1.2
.70 2.04
3.48
3.14
2.86
2.62
2.42
4.04
3.66
3.34
3.07
2.84
4.64
4.21
3.85
3.54
3.28
0.253 0.320 0.396 0.481 0.576 0.680 0.788 0.901 1.02 1.15 1.28 1.57 1.90
0.235 0.297 0.368 0.447 0.535 0.632 0.734 0.839 0.950 1.07 1.19 1.47 1.77
0.219 0.278 0.343 0.417 0.500 0.591 0.686 0.784 0.889 1.00 1lk.. 1.37 1.66
2.25
2.10
1.97
2.64
2.46
2.31
3.05
2.85
2.68
1.~~
~
1.4
0.000 0.008 0.029 0.056 0.089 0.125 0.164 0.204 0.246 0.2~ 0.333 1)424 0.516 0.610 0.704 0.800
=AMERICAN INSTITUTE OF STEEL CONSTRUCTION