General Information

Figure 1 shows a freestanding steel carport.

Freestanding carport.
Freestanding steel carport

The steel structure consists mainly of five main units (blue background, 1 to 5), three front columns (installed on units 3 to 5), tie beams, purlins, and metal roofing sheets. The main units, the front columns, and the tie beams are made of circular hollow sections, while the purlins are made of rectangular hollow sections. The main unit spacing s ≅ 4.5 m, and the roof width w ≅ 6 m.

Irregular Structure

Figure 2 shows the carport.

Freestanding carport.
Freestanding steel carport with tapered trusses

The main units consist of back-spanned cantilever trusses that are tapered toward the free end. The cantilever trusses have two different web member arrangements (A and B). Figure 3 shows a schematic lateral view of main units 1 and 2.

Main units 1 and 2.
Lateral views of two tapered trusses with different web member arrangements

The web member arrangement A has three diagonals and four verticals, while arrangement B has two diagonals, five verticals, and a single-bent longitudinal member.

  • What is the structural purpose of the different web member arrangement?
  • Figure 4 shows main units 4 and 5.

    Main units 4 and 5.
    Tapered trusses with front columns
  • What are the structural reasons to install the front columns on main units 3 to 5?