Zsection

Zsection is a structural steel profile with a Z-shaped cross-section, used in construction and mechanical applications. The profile is formed by three flat segments: a central web with two offset flanges, creating a silhouette reminiscent of the letter Z when viewed in cross-section. Z-sections are produced in hot-rolled or cold-formed steel; thickness and overall dimensions vary with standards in different regions. They may be galvanized for corrosion resistance.

Z-sections offer good stiffness in the plane of the web and favorable bending characteristics for loads applied along the strong axis, while providing better torsional stability than some lighter sections of similar weight. They are commonly used as purlins and girts in roof and wall systems, track and support members, bracing, and lightweight framing. In design, the orientation of the section affects performance; the larger flange surfaces provide stability against buckling, while the slender web accepts shear.

Compared with I-beams, Z-sections are more compact and economical for certain spans and repetitive framing where long, straight members are advantageous. However, their asymmetric geometry can complicate connections and require proper detailing to avoid lateral-torsional instability.

See also: I-section, C-section, angle, structural steel sections, cold-formed steel.