Strength Characterization of Overlapped Timber Screws

Abstract

The possibility of transmission of axial forces between self-tapping screws fastened in the opposite faces of a timber element and loaded contrariwise is analysed. The screws are intended to be placed sufficiently close one to another and the threaded shanks overlapped by a suitable length. Experimental tests are conducted, varying type, penetration depth and overlapping length of the screws, to evaluate the actual strength and the type of failure of this fastening technique.