Limitations and Assumptions of DG11 floor vibration

Tekla Structural Designer
2021
Tekla Structural Designer

Limitations and Assumptions of DG11 floor vibration

The scope is primarily defined by the DG11 Ref. 1 but the following additional limitations and assumptions should be noted.

  • The design guidance is based on composite floors acting compositely with the steel beams. It is unclear whether the design approach is directly applicable to non-composite construction.
  • In DG11, if the slab is attached to the supporting member, the construction can be classed as composite for the purpose of carrying out a vibration analysis even in the absence of shear connectors. Tekla Structural Designer does not define such construction as composite and therefore will only class truly composite construction as composite.
  • For simplicity and to avoid the necessity of Tekla Structural Designer having to identify all the beams in the area selected for vibration assessment, the component of the unit mass from the self-weight of the beams is ignored. This will lead to a slight inaccuracy in the participating mass that is conservative (more mass is advantageous). Note, however, that beam self-weight is included in the calculation of beam deflection but only when the self-weight loadcase is included in the load combination.
  • Only members pinned at both ends can be selected for the check (both primary and secondary beams); beams with moment connections, cantilever beams etc are excluded.
  • Shear deflection in beams and girders is included in the analysis carried out by Tekla Structural Designer.
  • Precast slabs are excluded.
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