Civil Engineering Reference
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FIGURE 9.4 Typical welded joints in steel railway superstructures.
9.2.4
W ELDED J OINT D ESIGN
9.2.4.1
Allowable Weld Stresses
Filletweldstransmitforcesbyshearstressintheweldthroatandgrooveweldstransmit
loads in the same manner as the elements that are joined (e.g., by shear, axial, and/or
bending stresses).
Therefore, for fillet welds, the allowable shear stress is the smaller of 0.28 F u
through the weld throat based on electrode strength or 0.35 F y at the weld leg based
on base metal strength.
For groove welds the allowable shear stress is 0.35 F y and the allowable tension
or compression stress is 0.55 F y based only on base metal strength. This is because
complete joint penetration welds using matching electrodes (as specified by AWS,
2005) are at least as strong as the base metal under static load conditions. In addition,
 
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