Investigation on Withdrawal Strength of Hornbeam Dowel Joint

For investigation of withdrawal strength in dowel joint, the effect of doweldiameter (6,8 and 10 mm), distance between dowels (20,25 and 30 mm) andwood type (Beech, Alder and Spruce) were studied. The dimensions of malcingT-form Joint in dowel Joint were 5*5*2.5cm. Type of wooden dowel using inthis research was carpinus betulus which is the common dowel in malced. Also,PVA was used in dowel joint a glusive. According to, 27 treatment and 4replicate, totaly 108 T-shape samples were tested. The results indicated that thehighest and lowest withdrawal strength has been shown in beech and spruse,respectively. By increasing the dowel diameter from 6-8mm, the withdrawalstrength increased, and with increase of dowel diameter to 10mm, this propertydecreased. The highest withdrawal strength was related to 25mm distance.