Effect of Various Joint Conditions on Maximum Loads and Yield Loads
Yutaka NISHIUCHI, Yasushi KANAGAWA, Shinji FUJIWARA and Junfichi GOTOU
Abstract:The allowable load or yield load in the various joint methods of wood constructions was prescribed by revision of the Building Standard Law. The allowable load of full pinned mortise-and-tenon joint which is one of traditional joint methods was provisionally specified to the numerical value of 3.81kN. This study was intended to estimate the effects of end (edge)-distance, tenon thickness and dowel shape on pull up resistance of full pinned mortise-and-tenon joints. The relationship between maximum load, yield load and end(edge)-distance did not show a clear tendency. In all examination conditions, the ratio of maximum load and yield load was 1.5-2.0. The experimental result is leading yield load can be evaluated as the allowable load. Although allowable loads with round dowel showed no remarkable effect on tenon thickness, allowable loads with square dowel depended on tenon thickness remarkably. The allowable load of 40mm tenon thickness exceeded the standard value of 3.81kN on all conditions. However, in the case of 30mm tenon thickness, values less than the standard value were also measured under some experimental conditions. Key Words:Full pinned mortise-and-tenon joint, Maximum load, Yield load, Allowable load