General Information
Figure 1 shows a steel canopy roof.
![Steel canopy roof with front columns](canopy-roofs/structure-8/canopy-roof-8.jpg)
Front Columns
Figure 2 shows a canopy roof sector viewed from below.
![Steel canopy roof structure viewed from below](canopy-roofs/structure-8/2-transverse-trusses.jpg)
The steel structure consists mainly of front columns, transverse trusses, purlins, and metal roofing sheets. The front columns, transverse trusses, and purlins are made of square hollow sections. Each transverse truss has an overhanging bottom chord, which is connected to a front purlin or a front column. Figure 3 shows a schematic layout of a roof sector, while figure 4 shows a connection between a front column and the ground slab.
![Schematic layout of a steel canopy roof with front columns](canopy-roofs/structure-8/3-layout.jpg)
The width b ≅ 3.5 m, and the front columns are not over the ground slab.
![Connection between column and ground slab](canopy-roofs/structure-8/4-column-base.jpg)
Each front column is connected to the ground slab by a cantilever base plate and two anchor bolts.
How does the base plate affect the column design?