General Information

Figure 1 shows a freestanding steel carport.

Freestanding carport.
Freestanding steel carport with trusses and stay cables

The steel structure consists mainly of two columns, transverse- and longitudinal trusses, a tie beam, roof cross-braces, stay cables, purlins, an anti-bird net structure, and metal roofing sheets. The columns, trusses, purlins, tie beam, and the beams for the anti-bird net support are made of circular hollow sections, while the stay cables and roof cross-braces are made of wire ropes.

Carport Structure

Figure 2 shows the carport.

Freestanding carport.
Freestanding steel carport with trusses and stay cables

The length l ≅ 5 m, and the width w ≅ 4 m. The longitudinal truss (red background) is installed over the free-ends of the transverse trusses (yellow background) and braced by two diagonals that are connected to the upper chords; the height h ≅ 0.5 m. Figure 3 shows a lateral view of the carport.

Freestanding carport.
Lateral view of a freestanding steel carport

The transverse trusses are approximately tapered toward the carport entrance; the upper chords are curved, while the metal sheets have a constant slope. Figure 4 shows a bottom view of a roof unit.

Roof unit (bottom view).
 Roof structure of a freestanding carport

There are four metal sheet supports (marked by the numbers) with a non-constant spacing. Support 1 is the longitudinal truss, while supports 2 to 4 are the purlins, which are installed over and between the upper chords. A and B are the beams for the anti-bird net support, while the yellow dashed lines indicate the roof cross-braces, which are connected to the columns as shown in figure 5.

Roof cross-braces to column connection.
Roof-cross brace to column connection

The connection consists of a turnbuckle and a U-bar, which is welded to the column; the wire rope termination consists of a U-bolt clamp. The stay cables are connected to the transverse trusses as shown in figure 6.

Stay cable to transverse truss connection.
Stay cable to truss connection

The connection consists of a turnbuckle, an additional cable, and a single-hole plate welded to the upper chord (away from a truss node); each cable is terminated with a U-bolt clamp. Figure 7 shows a schematic three-dimensional view of the used carport and an alternative variant.

Three-dimensional views.
Three-dimensional drawing of two freestanding steel carports

The steel structure of the alternative variant consists mainly of two Y-frames, purlins, and metal roofing sheets. The Y-frames are made of I-sections (standard and haunched), while the purlins are made of C-channels. Both variants have the same external geometry.

  • Which carport probably uses fewer resources?
    For the used carport. Are all elements required for structural reasons?
    What are some possible reasons for choosing the used carport instead of the alternative variant?