Withdrawal stiffness of threaded rods embedded in timber elements

In the present paper, the withdrawal stiffness of axially loaded threaded rods screwed into timber elements is investigated using theoretical, numerical and experimental methods. The theoretical approach is based on the application of classical Volkersen theory on axially loaded connectors. An experimental investigation of withdrawal of threaded rods from glulam elements is presented. The parameters of this investigation are the embedment length and the angle between the rod axis and the grain direction. The theoretical and numerical estimations are compared to the experimental results.