Which adjustment factor is NOT needed for a sawn lumber beam subjected to edgewise loading?

For a sawn lumber beam subjected to edgewise loading, the adjustment factors that are typically considered include the load duration factor, moisture content factor, and possibly a volume factor depending on the situation.

The load duration factor accounts for how the duration of a load affects the material's ability to sustain that load without failure. Sawn lumber has different properties based on whether a load is applied for a short time or a long time.

The moisture content factor is essential as well, since the mechanical properties of wood are significantly influenced by the amount of moisture it contains. High moisture content can reduce the strength of the lumber, whereas lower moisture levels can increase its strength.

The volume factor may come into play in specific scenarios where the size and overall dimensions of the lumber may impact its performance, especially when considering larger members or different loading conditions.

In contrast, the flat use factor is not a standard adjustment for edgewise loading scenarios. It generally pertains to situations involving flatwise loading conditions, such as when lumber is used in applications where loads are applied across its width rather than its depth. Thus, it is not relevant to beams loaded edgewise.