The answer depends on the specific application and soil conditions, as both round and square shafts offer distinct advantages in torsional strength:
- Round Shafts: These are noted for their superior torsional performance due to an axisymmetric geometry. This circular cross-section distributes shear stress evenly around the perimeter, providing a higher torsional capacity per unit area. This makes them highly effective in dense or cohesive soils, significantly reducing the risk of the shaft twisting during high-torque, deep commercial installations.
- Square Shafts: These are recommended for heavy commercial and industrial scenarios where axial loads exceed 100 kips. Square shaft leads can provide superior torsional strength compared to round shaft leads of equivalent steel weight. This prevents shaft twist when encountering shallow obstructions or extremely dense soils.
However, in demanding installations like weathered rock or dense till, square shafts may experience localized stress risers at their corners, which can initiate material distress earlier than round shafts.
Ultimately, selecting the right shaft requires a geotechnical analysis, as round shafts provide more predictable load-bearing performance in high-torque settings, while square shafts are engineered for the highest capacity structural requirements.
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