# The Influence of Screw Spacing on the Shear Resistance of Walls

The finite element analysis results of walls with different screw spacing are listed in Table 7. With the narrowing of screw spacing, the shear resistance of walls was increased. When the screw spacing of walls with single-sided gypsum sheathing, or with single-sided OSB sheathing or with gypsum sheathing on the back and OSB on the face, was adjusted form 150/150 (the screw spacing of wallboards was 150 mm at the perimeter and 150mm in the middle field) to 150/300, their shear resistance was improved by 3.36%, 2.85% and 1.93%, respectively. And if changed to 100/300, the shear resistance of walls was respectively improved by 6.98%, 1.33% and 10.54% compared with walls with screw spacing 150/300. So we can conclude that the narrowing of screw spacing in the

Table 6. Finite element analysis results of wall with single-sided gypsum sheathing on the face.

 Dimension of walls (height x width) Height-width ratio ^max (kN) Shear resistance (kN/m) 2.4 m x 2.4 m 1:1 12.63 5.26 2.7 m x 2.4 m 1.125:1 10.63 4.44 3 m x 2.4 m 1.25:1 9.29 3.87

Table 7. Finite element analysis results of walls.

 Wall type Screw spacing P 1 max Shear resistance (mm) (kN) (kN/m) @ 100/300 9.93 4.14 SSG @150/300 9.29 3.87 @150/150 9.60 4 @100/300 27.34 11.39 SSO @150/300 26.98 11.24 @150/150 27.74 11.56 @100/300 38.52 16.05 DSGO @150/300 34.84 14.52 @150/150 35.53 14.80

middle field lightly influenced walls’ shear resistance when the screw spacing was less than 300 mm, but the walls’ shear resistance was strengthened greatly with the decrease of screw spacing at the perimeter. This was in agreement with the phenomenon observed in the test.