The sectional shape of steel Z purlins makes them more effective at resisting bending moments. Compared to metal Z purlins, they offer slightly greater sectional properties along the axis parallel to the roof when compared to C-purlins of the same specification. When considering the axis perpendicular to the roof, steel Z purlins again have slightly larger sectional properties on the unfavorable side compared to C-purlins.
Twisting Resistance: The asymmetrical sectional design of metal Z purlins allows them to better distribute stress when subjected to torque, reducing deformation and the risk of failure due to twisting. Multiple steel Z purlins form a space frame system through ties and braces, with torsional stiffness improved by 3-5 times.
Efficient Load Transfer: The 30°-45° angled end overlaps of metal Z purlins increase the load transfer path by more than 50%, allowing for more uniform distribution of the roof load to the main structure and reducing local stress concentrations.
Steel Z purlins are suitable for roof slopes where i > 1/3. As the roof slope increases, the bending section modulus of metal Z purlins symmetric to the vertical direction becomes more efficient, better meeting the load requirements of steep roofs and effectively enhancing roof stability.
The two flanges of steel Z purlins are parallel to each other, making them easy to connect using various methods such as bolt connections or self-tapping screws. Installation is straightforward, allowing for quick connections between purlins and easy fixation to the main structure. When designed as continuous beam purlins, metal Z purlins feature a simple structure and convenient overlaps.
Metal Z purlins, with their slanted edges, can be stacked in layers during storage, occupying minimal space and making them easy to store and manage on construction sites. This also reduces transportation costs and complexity.
Steel Z purlins exhibit excellent resistance to bending, shear, and compression, allowing them to withstand significant roof and wind loads.
Corrosion Resistance: The surface can undergo hot-dip galvanizing or other treatments to improve corrosion resistance, extending the lifespan of the purlins. They are suitable for roof structures in various environmental conditions.
In conclusion, steel Z purlins, with their superior mechanical properties, wide applicability, easy installation, and excellent material performance, have become an indispensable component in modern building roof structures. Their exceptional bending, torsional resistance, and efficient load transfer capabilities have led to widespread use in large-span roofs, industrial plants, warehouses, and other buildings.
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