Page 104 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch03.qxd 9/29/05 5:05 PM Page 3.36

CONNECTIONS

3.36 CHAPTER THREE

Φ

W

W
t e
g
Skewed fillet welds
(a)

Φ

t
W

W
t e
g

Skewed fillet welds
(b) FIGURE 3.24 Acute angles less than 60°
and obtuse angles greater than 120°. (Source:
FIGURE 3.23 Geometry of skewed fillet welds. (a) Acute side, 60° ≤ A. R. Tamboli, Handbook of Structural Steel
Φ ≤ 90°: AWS, W = t e [2 sin(Φ/2)] + g; AISC, W = W + g. (b) Obtuse Connection Design and Details, McGraw-
side, 90° ≤ Φ ≤ 135°: AWS, W = t e [2 sin(Φ/2)] + g; AISC, W = W. Hill, 1999, with permission.)

3.2.21 Obliquely Loaded Concentric Fillet Weld Groups

The strength of a fillet weld depends on the direction of loading. Welds that are loaded in their lon-
gitudinal direction have a nominal strength of 0.6F EXX times the effective weld area, while welds
loaded transverse to their longitudinal axis have a strength 1.5 times greater. The nominal strength
per unit area of welds loaded between these extremes can be found as

.
.
F = 06 F EXX ( 10 + 050sin 15 . ) θ (3.13)
.
w
where F EXX is the electrode classification number, ksi.

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