Block shear model for axially-loaded groups of screws

Keywords: axially-loaded groups of screws, hanger loaded perpendicular-to-grain, block shear failure mechanism, load sharing. Primary axially-loaded screw groups inserted perpendicular- or under an angle-to-the-grain of structural timber elements, see Figure 1.1 (left), cause locally shear, rolling shear and tensile perpendicular-to-the-grain stresses. Under certain conditions, these stresses lead to brittle joint failure mechanisms in timber, such as tension perpendicular-to-the-grain (splitting), row or block shear.