Compared with ordinary steel structure, light portal frame structure has the following technical characteristics:
1. The cross-sectional dimension of structural members is small, which can effectively utilize the building space, reduce the height of the building, and make the building beautiful.
2. Portal frame has good stiffness, light weight and can be assembled with beams and columns, which provides favorable conditions for fabrication, transportation and installation.
3. The steel quantity of roof rigid frame is only 1/5-1/10 of that of common steel roof frame, which is an economical and reliable structure form.
Composition of Portal Frame Structure
Main load-bearing skeleton-portal frame
Purlins, wall beams-cold-formed thin-walled steel
Roofing, wall-profiled metal sheet, color steel sandwich panel
Roofing and wall insulation cores-polystyrene foam, polyurethane foam, rock wool, etc.
Support - roof support, pillar support
Structural properties of portal frames:
1. The integrality of portal rigid frame roof system can be guaranteed by purlin and corner support, thus reducing the number of roof support, while supporting is made of tensioned round steel, which is very portable.
2. The beam and column of portal frame mostly adopt variable cross-section bar, which can save material.
3. The poles of the components are thin, and the requirements for fabrication, painting, transportation and installation are high.
4. The flexural stiffness and torsional stiffness of members are relatively small, and the overall stiffness of the structure is relatively flexible.