Stepped gooseneck splice

(Koshikake kamatsugi)

square section lumber between 150mm and 200mm. For sections of more than 200mm oblique scarf spliccs are more appropriate.

The gooscncck splice is also used on groundsills; however, it has a higher strength than the dovetailed splice. In prac-ticc, it is used to join larger lumber sections than the preceding splice. The gooscncck with tenon and mortise serves to splice

Tost sample dimensions. Angular dimensions are shown on the next page.

,1J

Efevaton

1

i

i

Elevation

Ii !

Female

Male

Female

O Male and female

Male

Efcvaton

Ortarmrabon ot tho p«h ol the rfcs . on the head Ol the gooseneck usrg a 15 mm carpeter

rrvn

Efcvaton

Ortarmrabon ot tho p«h ol the rfcs . on the head Ol the gooseneck usrg a 15 mm carpeter

© The male slides into the female

SPUCi 7

Arrangement of dial gauges

The tensile test was performed on an assembly of the same size and material as for the dovetail splice. At ultimate strength, two modes of failure occurred. At first the joint failed in bearing, crushing the head of the gooseneck against the abutments of the female end. The second mode involved the shearing of a rib at the head of the male end. The ultimate strength of the model tested was 2400kg> a significant increase in strength compared to the dovetailed splice.

is>

■K

m

CO

in

Arrangement of dial gauges

Urthal agacement of thekmtecrd (average of gauce 3 ard 4)

Urthal agacement of thekmtecrd (average of gauce 3 ard 4)

Axul displacement (wage of gauge ! and 2)

O^accment Imm) Load-displacement curve

Before failure

Before failure

1 Bearing failure mode

2 Shearing failure mode

After failure

1 Bearing failure mode

2 Shearing failure mode

After failure

Test sample dimensions

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