Pinning of the knee brace tenons
was not addressed in this study.
These specimens were identical to the first set except that the tenons
were offset and centered 0.
Thus, the bending moment capacity of the tenons
themselves is estimated to be:
When the desired tenon
depth was less than rail depth, top and bottom edges of the tenon
were notched to produce the desired tenon
For static tests, the above expression estimates that pinned tenons
with cross pins half the diameter of the tenon
have only [(0.
As used in modern times, mortise and tenon
, dovetailing, tongue and groove and their many variations meet an important requirement for a strong joint: They present several surfaces where parts can be glued together along the grain.
All of the rail stock, dowels, and loose tenons
were conditioned and maintained in an environmental chamber at 20 [degrees]C and 50 percent RH for 48 hours prior to machining.
The ultimate load capacity of the 3-inch diameter southern yellow pine tenons
was essentially twice that of comparable 2-inch diameter tenons
2 mm) diameter tenons
on the ends of the center end-rail would also reduce bending moments on the top and bottom joints by more than 30 percent.
Most of the tests were conducted with 2-inch-diameter tenons
, but a limited number of specimens with 3- and 4-inch- diameter tenons
First, the king-post tenon
and the end-rafter tenons
intersect in the ridge beam.
In addition, tests were needed to determine whether cross-pinning of tenons
is feasible, either as a back-up measure to enhance structural integrity in case of inadequate gluing or glue bond failure, or as a substitute for gluing in areas where adhesives may be unduly costly and in short supply.