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TCC Norms
In addition to EC 5 »Design and construction of timber structures«, the HBV shall be standardised. In preparation for this, several research institutions in Europe are currently working on a technical specification.
Properties of TCC
- Large load spans
- low dead weight
- good fire resistance
- good sound insulation
- low susceptibility to vibration
- prefabrication possible
Elascon Standarddecke
1. C-TC-S: Composite Timber-Concrete »Standard«
Single of multi-field supporting systems. Here the composite design is implemented above the timber beams. Where the old shuttering is intact and the timber beams have not suffered any damage, and where the false ceiling is packed with a sound deadening compound, the old floorboards may also be used as lost formwork. The minimum concrete layer thickness is 6 cm.
Advantages of the Composite TC- System variant:
+ Strengthening of the supporting structure by a factor of 10
+ vibration no longer discernible
+ net load-bearing capacity increase by a factor of 3
+ statically rigid slab
+ supporting structure with transverse load distribution
+ single loads can be readily integrated
+ height compensation is possible
+ F90B-l fire protection from above
+ impact sound improvement by 5 to 7 dB by the concrete
+ interception of secondary sound paths by integrated wall connections.
Reservations to be considered:
– The room height will be decreased by at least 6 cm
Elascon flat ceiling
2. C-TC-F: Composite Timber-Concrete »Flat Ceiling«
Here the concrete-timber composite structure is implemented in the intermediate area at the level of the lost floor. From the upper edge of the timber beam downwards at least 6 cm height is needed. Die SFix-shear connectors are screwed laterally into the beams. The Elascon floor surface C 25/30 F 6,5 G 8 LVB is then scraped field-by-field so as to finish level with the upper edge of the beam. It is necessary to check that the old lost floor shuttering is capable of supporting the weight of the freshly poured concrete which amounts to 150 kg per square metre.
Advantages of the C-TC-F variant
+ no loss of room height
+ net load bearing capacity increase by a factor of 3
Reservations to be considered:
– no transverse load distributing supporting structure
– Additional fire prevention measures on the upper side needed
– 15 % implementation cost increase
Elascon combination ceiling
3. C-TC-Combination: Composite Timber-Concrete »combination ceiling«
Basically, this solution is a combination of a C-TC system and a C-TC composite. Here the Elascon floor concrete is poured both into the space between the timber beams and over the beams themselves. The shear connectors are then set to match the geometry of the room and are therefore effective both downwards - into the lost floor area, and upwards - into the compression zone. To prevent the concrete from breaking away again in longitudinal beam axis direction, a thickness of at last 4 cm cover is needed above the beam, and in addition, a reinforcement layer is used to limit fissuring.