Jonathan Ochshorn

© 2008-2014 Jonathan Ochshorn.

contact | academic homepage | Structural Elements text | calculator homepage**Directions:** Select wood species and grade (or enter values for modulus of elasticity, *E,* and allowable stress, *F _{c},* after setting "Species" for "Other"), wet service conditions, duration of load factor (

See additional explanations and examples in my text. The duration of load factor, *C _{D},* for common proportions of dead and live loads is 1.0. For other combined loads (e.g., snow and dead load), see text for further details.

Note that the size factor adjustment (*C _{F}*) should

The x-axis refers to the "strong" axis of bending, except in the case of 3-2x4's bolted together, where the y-axis is stronger (see Fig. 2a). Fig. 2b shows an example where different unbraced lengths apply to the two axes: sheathing nailed to the stud prevents buckling about the y-axis, but not the x-axis. In this case, one might model the column with an unbraced height of 8 feet about the x-axis, and 0 feet about the y-axis.