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Shear transfer at end of deep truss

Shear transfer at end of deep truss

Shear transfer at end of deep truss

(OP)
The architect is requiring a 5' overhang for wood trusses.  This gives a height of truss at bearing of 2'-9".  With truss lookouts, shear transfer from diaphragm to blocking to collector to shear wall is easy enough with Simpson ties.  Is there an easy way to do this with deep truss bearing?

RE: Shear transfer at end of deep truss

You need to put some diagonal in that truss otherwise it will never work for gravity loads.

You can put the collectors directly above the walls and then brace it back down to top of wall level.

 

RE: Shear transfer at end of deep truss

I have used small trussed 2x4 sections between the trusses.  Basically a square or rectangular truss.  Anchor as required.

RE: Shear transfer at end of deep truss

Box with plywood sides and 2 x 4 top/bottom and truss sides.

RE: Shear transfer at end of deep truss

Trussed "Shear Blocking Panels" can be supplied by truss fabricators to handle lateral loadings that are perpendicular to common trusses and occur at interior or cantilever bearing walls. The rectangular truss will typically have a single diagonal web and be loaded with a horizontal top chord load with take out along the bottom chord in the opposite direction (and separate load case with the directions reversed).

It is important to detail the Boundary Nail of sheathing to top edge of blocking panel, and the panels attachment to the bearing top plate (say Simpson LTP4's).

The horizontal load applied to the top edge of the panel causes compressive and uplift loads on the blocking panel's verticals that needs to be addressed: Hold-down, nailing to common truss verticals with transfer to adjacent panels vertical, or site built transfer blocking is needed.

It's quite common for truss blocking panels to be supplied but not laterally analyzed correctly. Check/Design/Detail the load path.

Another method for cantilevers is to have the roof boundary end at the eave/tail, Boundary Nail to the top edge of blocking, and path the horizontal load back to the wall with structural sheathing attached to the bottom edge of the bottom chord of the truss.

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