VT-Columns are fire-resistant steel composite columns with a steel tube, a steel core and load-bearing concrete, which is usually filled in at the construction site.
Load carrying principle
Generally, VT-Columns are pin-ended columns with essentially normal forces as design loads. In the ultimate limit state at normal temperature all components of the VT-Column are considered as statically active. In case of fire, the steel tube is regarded as not statically active because of the high temperature. However, the tube prevents the concrete from spalling. This ensures that the steel core is protected against overheating.
The static proof of the VT-Columns at normal temperature and in case of fire are provided in a verifiable form according to the general calculation method of Eurocode 4 (EN 1994-1-1 or EN 1994-1-2) by Verbund-Technik GmbH.
Your benefits at a glance
- Slender, filigree design
- Increase of the usable area
- High load carrying capacity, low deformation
- Resistant to fire without additional fire protection
- Fast construction progress
- Easy installation
- Dimensional accuration
- Aesthetic, smooth, robust surface
Possible shapes of the cross-section
The VT-Column cross-section can be realised as follows:
- Round
- Square
- Rectangular
Depending on the static requirements, various steel cores can be used:
- Full cross-section: round, square or rectangular
- Any standard profiles (e.g. IPE, HEA, HEB, etc.)
- Individual welded constructions made of sheet metal