Investigation of old hardwood structure element

Szőke, Fanni és Kánnár, Antal (2024) Investigation of old hardwood structure element. In: 11TH HARDWOOD CONFERENCE PROCEEDINGS : Sopron, Hungary, 30-31 May 2024. Hardwood conference proceedings . Soproni Egyetem Kiadó, Sopron, pp. 187-191. ISBN 9789633345184

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Absztrakt (kivonat)

This paper reports on the structural testing of the dismantled Kecske hill lookout tower. The wooden structure stood in the Szárhalom forest, near Sopron, Hungary. It was erected in 1973, closed off in 2018 due to the failure of its structural elements, and finally demolished in 2021. Structural elements were tested and evaluated after 45 to 48 years of service, using, among others, electron microscopy, dynamic modulus of elasticity measurements, compression and bending tests. A literature review was conducted on the structural details of lookout towers, on the characteristics and production technology of gluedlaminated wood, as well as the examined materials, including Norway spruce (Picea abies) and sessile oak (Quercus petraea). Literature values of compression and bending strength were also determined to compare them to our results. The analysis extended to describing the details of the new lookout tower, including the footing and stair installations, which were the main failure locations in the old structure. Based on the results, samples cut from the undamaged parts of the old structure had high residual strength even after 45 years of service, but the structure as a whole was no longer safe, due to the failure of certain elements.

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