Brilliantly updated – in wood
The original stone columns are 1,5 metres thick. Metsä Wood’s Kerto® LVL material was chosen for the beams and columns. The LVL (laminated veneer lumber) beams are actually just 1/3 of the originals. Thanks to their many tightly glued 3 mm veneer layers, Kerto® provides load-bearing strength – even for designs from antiquity.
That’s one reason why the wooden Colosseum would have over 12 % more space than the original – and it would be possible to take into account modern needs such as plumbing – something the original didn’t have. Other systems, including heating, ventilation and air conditioning, could likewise be easily integrated due to the extra space freed-up by using wood – and because wood structures can be easily modified. Overall, the new Colosseum design has 2 underground floors for parking and storage constructed of concrete, and 5 above-ground wood.
KERTO® CAN CARRY THE LOAD
Kerto LVL’s load bearing capacity is such that there could have been fewer columns – if more liberties had been taken with the original design. The long spans are longer than in the original, and could have been even longer if needed – up to 25 metres.
SAFER THAN STEEL
From a fire safety point of view, the wooden structure would actually also be safer than steel, as wood chars at a speed of 0.7 mm/min and doesn’t collapse at once after the designated fire resistance time is reached – as steel may.
Kerto is a structural LVL and fulfils the requirements of EN 14374. It has also undergone rigorous testing and its safety level in case of fire can be designed to meet requirements of Eurocode 5.
BUILT TO PLEASE ANY AUDIENCE – EVEN CAESARS
To provide the comfort a modern audience is used to, Laiho decided to add a steel-framed roof – designed using the same basic structure as a bicycle wheel. The roof is supported both by the elevator shafts as well as the Kerto® beams and also the elevator shaft structures.
This roof structure is designed so that both its compression and tension parts don’t stress the building frame excessively as would a normal compression roof. For example, the selected shape does not push the supporting elevators shafts outward.