First Part
Portal Frame System
1. Basic component diagram
2.Description
a. Mechanical principles
The portal rigid frame structure uses a transverse rigid frame composed of columns and beams as the main stress-bearing structure, and the rigid frame is a planar stress-bearing system. To ensure longitudinal stability, column supports and roof supports are provided.
b. Rigid frame
The rigid frame columns and beams are made of cross-section H-shaped steel, and various loads are transmitted to the foundation through the columns and beams.
c. Supports and ties
The rigid support is made of hot-rolled steel, usually angle steel. The flexible support is round steel. The tie rod is a pressure-bearing round steel pipe, which forms a stress-bearing closed system with the support.
d. Roof purlins and wall beams
Generally, they are C-shaped steel and Z-shaped steel. Resists the forces transmitted from the roof and wall panels and transfers the forces to the columns and beams.
3. Basic form of portal frame
c. Portal frame with partial second floor
4. Basic nodes
a. Column foot node
b. Beam and column nodes
■Partial second-layer nodes refer to the multi-layer frame system.
5. Rigid frame derivative form
■ Cranes and partial second floors can be arranged in derived form rigid frames.
■The gable rigid frame is essentially a multi-span rigid frame, but the middle column and the rigid frame column are rotated 90 degrees compared to the cross-section.
