Open beam frame buildings contain a portal frame supporting frame. Its internal steel I-beam columns and struts are interconnected. They are part of the supporting structure, especially for large-span gable production buildings and hangars.
We have created a steel portal frame structure that eliminates the disadvantages and challenges of the solutions mentioned in the previous sections, such as I-beams and connected rafters.
Two columns, several rafters and bolts hold the steel portal frame together. The columns and rafters, composed of open I-beams, converge on one side and create a sloping or gable profile. They have symmetrically formed profile through holes that are located in their ribs to each other along the axis of symmetry and at different widths along their lengths. Since their positional arrangement causes their variable stiffness to increase from the bottom up, it is not accidental.
We can reduce the amount of structural steel used and, consequently, the weight of the overall structure of this frame by using the steel portal frames mentioned above for the construction of a production facility or hangar. Thanks to this, we are able to use beams up to 30 meters long, and this type of perforated steel also significantly increases the aesthetic value of the building. Engineering cables can freely pass through the openings and along the sloping roof and columns of the frame, which gives the structure a lighter appearance.
A portal frame composed of open I-beams converging on one side provides a significant load-bearing reserve of up to about 30%, according to computer simulation tests and static strength estimates. As a result, the load-bearing system can be expanded and additional equipment can be added to the building without having to change the type of open-web profile. In addition, the openings of symmetrically placed, unilaterally converging I-beams are ideal for use in power grids, especially as supporting parts of their equipment.
