<Original>Effect of Nail Pitch on the Shear Performance of Nailed GLT-plywood Specimens

Abstract

Nails, used without predrilling holes in the wood, prevent the decrease of slip modulus by their clearance at the predrilled hole as like bolt fastening. For the purpose of investigating the effect of nail pitch on the shear properties of nailed plywood-sheathed glued laminated timber (GLT) specimens. Double sided single shear tests were conducted by varying nail pitch from 50, 75, 100mm, and to 150mm. The slip displacements measured at three different place, i.e. upper, bottom and center, were almost same. It was concluded from this experiment that the slip modulus were not affected by the nail pitch and showed that there were big dispersions on the observed values. The yield strength showed constant values despite of nail pitch. The maximum strength increased slightly as the nail pitch increased. Judging from these experimental results, it might be concluded that the effect of nail pitch on the shear performance of nailed plywood sheathed GLT specimen could be ignored, thus from the practical point of view, nail pitch has no significant effect on the design calculation.