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Up Topic American Welding Society Services / Technical Standards & Publications / AWS D1.1 -06, Thickness Transitions for CJP
- - By PJPietr Date 06-19-2008 18:49
I'm in the process of engineering and detailing deep transfer-girder trusses made of jumbo W14 chord sections (shape group 4) and W14 diagonal members (shape group 3).  The members are orientated in the weak direction (chord flanges vert and diagonal members with flanges matching the plane of the chords).  The diagonal members have thinner flange sections than the chord flanges.  How would D1.1, article 2.7.1 and Figure 2.2 apply to the diagonal-to-chord full pen weld?  I don't see how tapering the chord flange locally to the diagonal member would be feasible, nor would the excessive weld build-up to the diagonal flange to meet the 2.5:1 taper be reasonable.  Incidentally, the diagonal members would be under compressive and tensile forces depending on the diagonal member's location within the truss.  Any comments on how to approach this in the detailing would be helpful.
Parent - By swnorris (****) Date 07-07-2008 14:10
The taper is supposedly removed from D1.1-08. That being said, sharp corners are not good so a reinforcing fillet to soften the notch effect is a good practice.  So a more complete answer might be to weld the sections toe to toe with CJP groove welds with a fillet on the surface of the weld to provide a smother profile for the weld transition to the chord flange.  Frequently trusses like this are too big to ship assembled and the shop welds a gusset to the toe of the chord and bolts the diagonal in the field.
Up Topic American Welding Society Services / Technical Standards & Publications / AWS D1.1 -06, Thickness Transitions for CJP

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