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November 10, 2019

Steel Structure Purlin

Steel structural purlin are important secondary structure in steel structure buildings. They are usually included in the steel structure in the list of steel structure workshop,which is generally listed separately. There are roof purlin and wall girt in steel workshop .

Galvanized purlin on the roof wall
The steel structure purlin is generally formed by cold-rolling hot-rolled sheet, the wall is thin and light, the cross-section performance is excellent, the strength is high, and the material is Q195~345. Common steel purlin are Z-shaped steel and C-shaped steel . The steel purlin is a secondary load-bearing member of the roof structure system that transfers the roof load to the steel frame.

First, the classification of steel structure purlin
Common purlins are C-shaped steel purlin and Z-shaped steel purlin.

1.C-shaped steel
C-shaped steel is cold-formed by hot coiling, with thin wall and light weight, excellent cross-section performance and high strength. C-shaped steel rolled by a molding machine, the product surface is smooth, high dimensional accuracy, material: Q195-345.
C-shaped steel is widely used in purlins and wall girt of steel structure workshop, and can also be combined into lightweight building trusses, brackets and other building components.

Steel Structure Purlin

2.Z-shaped steel
Z-shaped steel is mainly used for purlin of steel workshop, and is especially suitable for purlins of large-slope roof.

3.The difference between C type and Z type purlin
The angles of the Z-shaped purlins and the C-shaped purlins are different. The C-shape is 90 degrees, and the Z-shape is less than 90 degrees, which is approximately 60 to 75 degrees. Therefore, when the slope is used for a certain purlin, it is necessary to combine the force knowledge to consider the angle of the purlin. The Z-shape purlin can make full use of its bending resistance.
Compared with the Z-section, the C-section has a large difference in the mechanical properties of the strong and weak shafts, and the connection with the steel frame is mostly bolted, the door and window openings should used C-shape Purlin.

Steel Structure Purlin

1) When the slope of the roof is small, the flexural section modulus of the Z-shaped purlin is slightly larger than that of the C-type purlin, but the difference is not large; when the slope of the roof is increased, the Z-shaped purlin is symmetric with respect to the vertical direction. Big. Therefore, the Z-shaped purlin is suitable for roofs with a large slope;
2) For the wall, there is no big difference between choosing Z or C;
3) If the purlin wants to be made into a continuous member, it is best to use a Z-shaped purlin because it is easy to overlap.

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