What is axial load?

What is axial load?

• A. It is a force that passes through the centroid of the section under construction.
• B. A force that starts at the edge of the member
• C. A bending moment due to lateral loads
• D. A torsional force around the member axis

Answer: (A)

Axial load is a force that acts along the length of a structural member, passing through the cross-section’s centroid so that the load is aligned with the member’s axis. When the line of action goes through the centroid, the force produces pure compression or tension along the member without bending or twisting, and the cross-section shares the load evenly. If the force hits off-center, eccentricity creates bending moments in addition to the axial stress, which is why a force starting at the edge or any off-center location does not represent pure axial load. A twisting or torsional effect would rotate the member around its axis, which is also not axial load. In practice, vertical loads on columns are axial when they act straight along the member through its centroid, either in compression or tension.

Axial load is a force that acts along the length of a structural member, passing through the cross-section’s centroid so that the load is aligned with the member’s axis. When the line of action goes through the centroid, the force produces pure compression or tension along the member without bending or twisting, and the cross-section shares the load evenly. If the force hits off-center, eccentricity creates bending moments in addition to the axial stress, which is why a force starting at the edge or any off-center location does not represent pure axial load. A twisting or torsional effect would rotate the member around its axis, which is also not axial load. In practice, vertical loads on columns are axial when they act straight along the member through its centroid, either in compression or tension.