ANALYTICAL AND EXPERIMENTAL RESEARCH ON THE PULL-OUT BEHAVIOR OF LAGSCREWBOLT (LSB)

We studied nonlinear pull-out behavior of Lagscrewbolt (LSB) using a newly developed nonlinear analysis method based on a classical analysis of mechanical joint. To verify the nonlinear analyses, we conducted various full-scale pull-out experiments using LSBs with thread diameters of 30 and 35 mm and embedded depths of 150, 300, 450, and 600 mm in Larch and Sugi glulam. The results showed that, while current LSB design manual tends to give conservative assessments, the nonlinear analyses could predict the load-slip behavior more realistically, and there was a clear proportional relationship between the embedded depth and the pull-out strength.