Bending Strength and Moment-Rotation Characteristics of Two-Pin Moment-Resisting Dowel Joints

Tests were carried out to determine the bending strength and moment-rotation characteristics of T-shaped end-to-side-grain two-pin moment-resisting dowel joints. All specimens were constructed of sugar maple (Acer saccharum) and were assembled with a gap filling urea- formaldehyde adhesive. The plain dowels used were also constructed of sugar maple and measured 3/8 inch in diameter by 2 inches long. It was found that the bending strength, M, of the joint could be predicted by means of the expression M = Fd where F is the ultimate withdrawal of a single dowel and d is the distance between resultant compression and tension force vectors, which may be calculated as where d1 is the distance between dowels and d2 is the distance from the longitudinal axis of the dowel loaded in compression to the edge of the rail nearest it. Moment rotation values varied from 1.4 x 10-6 rad/pound inch for a 2-1/2 inch dowel spacing in a 3-1/2 inch wide rail to 1.55 x 10- rad/pound inch for a 0.5 inch dowel spacing in a 1.5 inch wide rail.

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