The alternative innovation
The use of small wood cross-sections and the simple screwing or nailing allows straight and curved forms with little wood consumption and waste. Static tests of the HarKun elements at the University of Applied Sciences in Cologne allow the statement that even the production of a multi-storey building with our wall elements is possible (see M. Dümmer, Cologne 2014).
By changing the cross-section of the wood or the number of stays, the load-bearing capacity of the construction can be increased several times. Therefore, the question whether our design approach ensures all elementary building loads (pressure loads, torsional stiffness, shear forces, statics, etc.) can clearly be answered with Yes. In fact, even with relatively small wood cross sections (Kvh 40x60mm) a high stability can be achieved.
Reference: Test laboratory FH – Cologne
During the examinations at the Cologne University of Applied Sciences (FH), conducted by the test engineers Prof. Dr.-Ing. Ansgar Neuenhofer and Prof.Dipl.-Ing. Hannelore Damm, as well as the engineer Martin Dümmer, the HarKun wall element of 3.00m height, 2.20m width and 0.24m thickness made of constructional timber spruce, which we had provided, was able to meet the expectations of the test engineers – a maximum of five tonnes was expected Pressure load – far surpass. It was found that a compressive load of 35 tons on the HarKun construction led to a yield of about 0.40 m. However, despite the enormous compressive forces, the test piece remained undamaged and, after raising the pressure ram, even returned exactly to its original shape. Such a test result therefore leaves quite positive statements on earthquake resistance.