The material types of purlins mainly include solid web type and light steel truss type. Among them, light steel truss type purlins include C-type steel purlins and Z-type steel purlins. The characteristics and application range of C-type steel purlins and Z-type steel purlins are as follows:
C-type steel purlins:
Features: C-type steel is made by cold bending of hot rolled plates, and has the characteristics of thin wall, light weight, excellent cross-sectional performance and high strength. The product surface of C-type steel is smooth and the dimensional accuracy is high. The material range is Q195-345.
Scope of application: It is widely used in purlins and wall beams of steel structure buildings, and can also be combined into lightweight roof trusses, brackets and other building components. In addition, it can also be used for columns, beams and arms in mechanical light industry manufacturing.
Specifications: The specification range of C-type steel purlins is relatively wide, such as (100×50×20×2.5) to (300×75×20×3.0).
Z-shaped steel purlin:
Features: In addition to its excellent properties such as high strength and steel saving, Z-shaped steel is particularly convenient and quick to install, and the material is also Q195-345.
Scope of application: Mainly used for purlins in steel structure buildings, especially for purlins on large slope roofs.
Specifications: The specifications of Z-shaped steel purlins are similar to those of C-shaped steel purlins, which are also (100×50×20×2.5) to (300×75×20×3.0).
The main difference between C-shaped steel and Z-shaped steel purlins is that their cross-sectional shapes are different. The C-shaped is 90 degrees, while the Z-shaped is less than 90 degrees, roughly 60 to 75 degrees. Therefore, when selecting purlins, it is necessary to consider the angle of the purlins according to the slope of the roof to make full use of its bending resistance. Z-type purlins are suitable for roofs with larger slopes, while both C-type and Z-type purlins are suitable for roofs with smaller slopes, but the utilization rate of the bending section modulus of Z-type purlins is higher.
