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American Steel Design
Section 2
2-26
2.12 Weld Design
Selected provisions of the AISC specifications for the Design,
Fabrication and Erection of Steel for Buildings, 1999, and the
American Welding Society D1.1 Structural Welding Code – Steel,
1998, have been implemented.
STAAD is able to select weld thickness for connections and
tabulate the various stresses. The weld design is limited to the
members having properties from wide flange, tee, single angle,
single channel, pipe and tube section tables only. The parameters
WELD, WMIN and WSTR (as explained in Table 2.1) govern the
weld design.
See Section
5.47.5
Since the thickness of a weld is very small in comparison to its
length, the properties of the weld can be calculated as line
member. Therefore, the cross-sectional area (AZ) of the weld will
actually be the length of the weld. Similarly, the units for the
section moduli (SY and SZ) will be length-squared and for the
polar moments of inertia (JW) will be length-cubed. The following
table shows the different available weld lines, their type and their
coordinate axes.
WELD
TYPE ANGLE WIDEFLANGE TEE CHANNEL PIPE TUBE
y
z
y
z
y
z
y
z
yy
z
y
z
y
zz
y
z
z
y
1
2
Figure 2.3
Actual stresses, calculated from the member forces, can be
specified by three names, based on their directions.