General Information

Figure 1 shows a covered sports tribune.

Covered sports tribune.
Covered sports tribune

The steel roof structure consists of braced overhanging beams, transverse ties, purlins, and metal roofing sheets. The braced overhang l ≅ 13 m, and the spacing ≅ 4 m.

Structural Behavior

The suspender S is marked in Figure 2.

Covered sports tribune.
Side view of a covered sports tribune

The two triangles mark the pinned support positions of the steel roof structure. Supposing a suspender arrangement between the actual position and the red line.

  • For a uniformly distributed load (p), how does the suspender arrangement affect the forces in the steel roof structure?
    What are some possible reasons for the used connection location?
  • The back diagonal D is marked in figure 3.

    Covered tribune.
    Covered sports tribune with braced overhanging beams

    Supposing a back diagonal arrangement between the actual position and the red line (vertical arrangement).

  • For a uniformly distributed load (p), how does the back diagonal arrangement affect the forces in the steel roof structure?
    Would placing the back diagonal in a vertical position (external foundation required) be more efficient than connecting the diagonal to the RC structure of the tribune?
  • Alternative Variant

    A schematic partial three-dimensional view of the used variant and a variant with a tapered overhanging beam without the suspender brace unit are shown in figure 4.

    Used and alternative variants.
    Three-dimensional views of of two covered sports tribune
  • What are the main pros and cons of the two variants?