Portal Steel Frame Buildings

Portal Steel Frame Buildings are the most common structure system. They are widely used in light steel buildings such as warehouses, workshops, sheds, and garages.

Compared with the reinforced concrete structure, the portal steel frame has the advantages of being lightweight, high rigidity, flexible design, reasonable force, and convenient construction.

The composition of Portal Steel Frame Buildings

1. Primary framing includes transverse rigid frames (including middle and end rigid frames), floor beams, crane beams, support systems, etc.
   2. Secondary framing: roof purlin and wall girt, etc.
   3. Envelope structure: roof and wall panels;
   4. Auxiliary structures: stairs, platforms, handrails, etc .;
   5. Foundation.

Steel columns, roof beams, and bracing systems constitute the primary force skeleton of the portal steel frame. It is the primary framing.
Roof purlins and wall girts support the roof and walls and provide lateral support for the main structural beams and columns, which form the secondary framing of portal steel frame buildings.
The roof and wall panels serve as the envelope and closure of the entire structure while also increasing the overall stiffness of the steel buildings.

The structural system of the portal steel frame buildings:

1. Transverse load-bearing structure:

1. The composition of the transverse load-bearing structure includes steel roof beams, steel columns, and foundation);
   2)Transverse load-bearing structure supports and transfers vertical and horizontal loads.

2. Longitudinal Frame Structure :

1. The composition of the longitudinal frame structure includes longitudinal columns, crane beams, wall bracing, rigid tie beam, and foundation)
   2)Ensure the longitudinal rigidity and stability of the buildings;
   3)Transmit and bear the longitudinal wind load, the longitudinal horizontal loading of the crane, the thermal stress, and the seismic acting on the gable at the end of the building and roof.

3. Roof structure

1. Roof panel: It can bear the vertical and horizontal wind loads acting on the roof panel. Generally, it uses a single-color metal sheet or sandwich panel.

2)Purlin: The support structure of the roof panel, which can bear the vertical load and horizontal wind load transmitted from reading more….