Engineering Transactions, 66, 3, pp. 229–247, 2018
10.24423/EngTrans.876.20180611

Numerical Simulation of Deflection and Stability of the Wooden Transmission Tower of Gliwice Radiostation

Błażej WOJACZEK
Silesian University of Technology
Poland

Andrzej KATUNIN
Silesian University of Technology
Poland

Janusz BROL
Silesian University of Technology
Poland

Katarzyna ADAMCZYK
Silesian University of Technology
Poland

The wooden transmission tower of the Gliwice radiostation is the highest wooden construction around the world. Considering that it is in operation over 80 years it is necessary to properly maintain it to extend its residual life. In order to analyse the most critical elements of the tower as well as to plan the strategy of its maintenance, including repairs and replacements of wooden elements, it is necessary to analyse its deflection and stress distributions under possible loading scenarios. In this paper, the authors presented an overview of history and construction of the tower as well as presented the results of static and buckling numerical simulations to evaluate a condition and a margin of safety, and to find the critical structural elements of this construction. The 3D numerical analysis is performed for the wooden transmission tower of the Gliwice radiostation for the first time. The results of simulations presented in this study indicate acceptable condition of the tower, in particular the resulting stresses under the static loading or buckling are at the level of 18% of the critical stresses according to the assumed geometrical model. However, further studies are necessary to refine numerical model and consider secondary elements of the tower, wood imperfections and other factors that have significant influence on its integrity and safety.
Keywords: wooden transmission tower; Gliwice radiostation; wooden constructions; finite element method; buckling analysis
Full Text: PDF

References

Adamczyk K., Static and strength analysis of the wooden tower of Gliwice ratiostation, including imperfections [in Polish: Analiza statyczno-wytrzymałościowa drewnianej wieży radiostacji gliwickiej z uwzględnieniem imperfekcji], Master Thesis, Silesian University of Technology, Gliwice, Poland, 2006.

Ajdukiewicz A., Malczyk A., Właszczuk M., Brol J., Static and strength analysis of the wooden communication tower [in Polish: Analiza statyczno-wytrzymałościowa drewnianej wieży telekomunikacyjnej], XLV Scientific Conference of the Committee of Civil and Water Engineering of the Polish Academy of Sciences and the PZITB Science Committee, Wrocław – Krynica, pp. 93–100, 1999.

Borri A., Corradi M., Grazini A., A method for flexural reinforcement of old wood beams with CFRP materials, Composites Part B: Engineering, 36(2): 143–153, 2005.

Brol J., Dawczyński S., Malczyk A., Adamczyk K., Testing timber beams after 130 years of utilization, Proceedings of the International Conference on Structural Analysis of Historical Constructions. SAHC 2012, Wrocław, Poland, Vol. 1., J. Jasieńko (Ed.), Wrocław: Dolnośląskie Wydawnictwa Edukacyjne, pp. 644–650, 2012.

Nożyński W., Wooden constructions. Examples of calculations of timber construction structures [in Polish: Konstrukcje drewniane. Przykłady obliczeń konstrukcji budowlanych z drewna], Vol. 4. Wydawnictwa Szkolne i Pedagogiczne, Warszawa 2017.

Polish-European Standard PN-EN 338: 2011, Structural wood. Strength classes [in Polish: Drewno konstrukcyjne. Klasy wytrzymałości], Polish Committee for Standardization, Warszawa 2011.

Polish-European Standard PN-EN 384: 2011, Structural wood – Determination of the values of mechanical properties and density [in Polish: Drewno konstrukcyjne – Oznaczanie wartości charakterystycznych właściwości mechanicznych i gęstości], Polish Committee for Standardization, Warszawa 2011.

Polish Standard PN-D-04103: 1977, Wood – Determination of static bending strength [in Polish: Drewno – Oznaczanie wytrzymałości na zginanie statyczne], Wydawnictwa Normalizacyjne, Warszawa 1977.

Polish Standard PN-B-03204: 2002, Steel constructions – Towers and masts – Designing and execution [in Polish: Konstrukcje stalowe – Wieże i maszty – Projektowanie i wykonanie], Polish Committee for Standardization, Warszawa 2002.

Polish Standard PN-B-02013: 1987, Building loads – Environmental variables – Frost load [in Polish: Obciążenia budowli – Obciążenia zmienne środowiskowe – Obciążenie oblodzeniem], Wydawnictwa Normalizacyjne, Warszawa 1987.

Polish Standard PN-B-02011: 1977, Loads in static calculations – Wind load [in Polish: Obciążenia w obliczeniach statycznych – Obciążenie wiatrem], Wydawnictwa Normalizacyjne, Warszawa 1977.

Wojaczek B., Analysis of dynamic state and stability of the wooden transmission tower of Gliwice radiostation, Master Thesis, Silesian University of Technology, Gliwice, Poland, 2017.

Wojaczek B., Development of 3D model of the wooden transmission tower of Gliwice Radiostation, Mid-semester project, Silesian University of Technology, Gliwice, Poland, 2017.




DOI: 10.24423/EngTrans.876.20180611

Copyright © 2014 by Institute of Fundamental Technological Research
Polish Academy of Sciences, Warsaw, Poland