The tower's principal supporting structure, built mainly of timber, consists of 16 larch glulam beams, which are curved and arranged in rotational symmetry. The upper part of the tower was stiffened by a close mesh of diagonal steel members. The lower part was stiffened by four compression-resistant and tension-proof crosses consisting of steel hollow sections anchored with the timber arches.

The spiral timber structure is attached to the timber arches by steel suspensions and secondary steel beams. The structural system was calculated according to the second-order analysis.

The calculation resulted in a compression force of 1,160 kN within the timber arches and a maximum horizontal tower deformation of 61.81 inches.

Project, Structural Analysis, and Construction
WIEHAG GmbH
Altheim, Austria
www.wiehag.com

Overall structure of tree tower in RSTAB (© WIEHAG)