The portal frame，purlin，Bracing system and the metal cladding rely on each other through reliable connection and support.
The main structure of the portal frame load-bearing structure divided into two types according to the kind of the rigid frame: the clear span structure without interior columns and the multi-span continuous structure with interior columns.
According to the specific project, it can also be used in single and multiple slopes, as well as in different spans and heights. Most of the foundation types adopt reinforced concrete independent foundations. According to the diverse requirements of the building for lateral displacement and deformation, from the perspective of saving steel, a variable-section beam-column, foundation hinge structure scheme, or an equal-section column variable-section beam, foundation rigid structure scheme can be adopted.
The main functions of the bracing system are:
1) The strut beam transmits the longitudinal horizontal force.
2) The horizontal bracing resists the horizontal force transmitted between the columns and roof beams.
3)Flange Bracing use to keep the stability of the outer plane
4) All bracing systems, together with purlin or wall girt and portal frames, which form a space system, which ensures the overall function of the space of the structure, bear, and transfers horizontal loads, and ensure the stability and convenience during the installation.
The main component types of purlins and wall girt are C-type or Z-type steel, and the size of the cross-section needs to determine through the load calculation. Compared with the Z-section, the mechanical properties of the C-section are quite different, C section steel connects to the portal frame bolted.
The Z-section can rigidly connect by substantial overlap, which can calculate as a continuous beam.
Therefore, in addition to door and window openings and other specialized areas, Z-sections should be preferred. The distance between the purlin and the wall girt usually not exceed 1.5 meters.
The application of the portal frame light steel building, which includes single-story industrial buildings, includes Warehouse, Workshop, and Storage Building, Commercial Building includes Supermarkets and Exhibition halls, and Agricultural Building includes Metal Barn, Poultry, and livestock building.
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Column and BeamH-section makes the portal frame columns and beams, which is primary steel framing. The various loads transmitted to the foundation through the columns and beams. |
Strut and BracingStrut Beam and Bracing are the second structure, bracing made by angle steel or rod steel, strut beam made of steel pipe, which forms a closed system with the bracing. |
C and Z PurlinC-shaped steel and Z-shaped steel are used to fix the metal cladding, and bear the load transmitted from the roof and wall panels, and spread it to the columns and beams. |
