General Information

Figure 1 shows a freestanding carport.

Freestanding carport.
Freestanding carport with triangular space trusses and suspension rods

Triangular Space Truss

Figure 2 shows the carport.

Freestanding carport.
Freestanding carport with triangular space trusses and suspension rods

The carport is made of a reinforced concrete part and a steel part. The former consists of a frame made of columns, transverse beams, and longitudinal beams, while the latter consists of triangular space trusses (made of circular hollow sections), suspension rods, purlins, roof braces, and metal roofing sheets. Figure 3 shows a schematic three-dimensional view of the carport.

Three-dimensional view.
Three-dimensional drawing of a carport with triangular space trusses and suspension rods

The truss length s ≅ 5 m, and the distance between the columns d ≅ 4 m. The suspension rods are connected to the mid-length of the trusses and the RC longitudinal beam. Figure 4 shows a carport sector viewed from below.

Carport with triangular space trusses.
Triangular space trusses of a freestanding carport

The triangular space truss consists of a bottom and two upper chords (inverted triangle), longitudinal diagonals, transverse diagonals, and upper cross members. The back-end connection is pinned and located on the bottom chord elevation level.

  • When are triangular steel space trusses structurally feasible?
    What are some possible reasons to use the above shown triangular steel space trusses?
  • Roof Bracing

    Figure 5 shows a roof sector viewed from below.

    Carport with triangular space trusses.
    Roof bracing of a carport with triangular space trusses and suspension rods

    The roof bracing consists of cross braces made of steel tension rods with bent ends; they are installed over the entire roof and connected to the ends of the bottom chords by plates, as shown in figure 6.

    Cross brace to triangular space truss connection.
    Cross brace to triangular space truss connection
  • Does the carport have a structural safety or serviceability problem without the cross braces?