“Boverket” the Design Regulations in Sweden, also called BKR has for a long time
been the mandatory standard that has guided and regulated construction design. But
at the end of 2010 BKR was replaced with Eurocode. This report deals with the
comparison of these two standards when it comes to wood construction. During
winter 2009/2010 there were many roof collapses due to excessive loads on the
roofs across Sweden. The majority of these roofs were made during 1980 when BKR
was the existing norm, therefore, this report will investigate whether there is a big
difference between designing of such roofs according to Eurocode instead of BKR.
These two norms were compared by looking at the design of roof structures that
consist of beams and columns. The roof beam was checked for buckling which is
designed to support the tennis center in Nyköping, and also a centrally loaded pillar
holding up the roof beam and superimposed loads.
The result of this investigation showed that to design according to Eurocode would
be more substantively economically because the design load bearing capacity becomes
It was also observed that, there isn’t a big difference between designing according to
BKR or Eurocode, therefore these roof collapses couldn’t occur due to designing
according to BKR. Designing according to BKR is even safer, but not substantively
economically as Eurocode. A comparison between the results indicate that the slight
difference is mostly caused by the the differences between the parameters/coefficients
used for design.
The roof collapse in Nyköping was caused by carelessness or ignorance, this tennis
center is undersized.
2013. , 70 p.