Model tests of global stability of two types of lightning protection masts under wind action
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RIS BIB ENDNOTEModel tests of global stability of two types of lightning protection masts under wind action
Publication date: 31.01.2019
Technical Transactions, 2019, Volume 1 Year 2019 (116), pp. 93 - 112
https://doi.org/10.4467/2353737XCT.19.007.10047Authors
The paper presents results of wind tunnel experiments of wind action on two free-standing lighting protection masts: cantilevered and tripod. Own similarity criteria concerning phenomenon of global stability loss were used in these tests. It was determined whether masts fulfill the requirements of overturning and shift global stability in range of base wind velocities adequate for Poland and different categories of terrain roughness according to the Eurocode [13]. Two possible forms of the loss of the global stability of lighting protection masts in strong wind were considered: overturning a mast and shifting of mast as a whole structures. The measurements were conducted for eight directions of wind attack, five positions of masts on the roof, two settings of the mast for tripod mast and one for cantilevered mast, two categories of terrain roughness. Conducted tests allowed to determine whether it is safe to locate tripod mast in all wind zones in Poland. Cantilevered mast can be located safely in I and II wind zone in Poland.
Modelowe testy globalnej stateczności masztów przy silnym wietrze
Streszczenie
W artykule przedstawione zostały wyniki badań oddziaływania wiatru na dwa wolnostojące maszty odgromowe: pojedynczy i na trójnogu. W badaniach tych zastosowano własne kryteria podobieństwa dotyczące zjawiska globalnej utraty stateczności. Określono, czy maszty spełniają warunki stateczności globalnej na obrót i przesuw w zakresie prędkości bazowych wiatru adekwatnych dla Polski i różnych kategorii chropowatości terenu według Eurokodu [13]. Rozpatrywano dwie możliwe formy utraty globalnej stateczności masztów przy silnym wietrze: wywrócenie masztu (jako całości) i przesunięcie masztu (jako całości). Pomiary przeprowadzono dla ośmiu kierunków natarcia wiatru, pięciu położeń masztu na dachu, dwóch ustawień masztu na trójnogu i jednego ustawienia masztu pojedynczego, dwóch kategorii chropowatości terenu. Przeprowadzone badania pozwoliły na stwierdzenie, czy bezpiecznie jest ustawić maszt na trójnogu we wszystkich strefach wiatrowych w Polsce. Wykazano, że maszt pojedynczy może być ustawiony w I i II strefie wiatrowej w Polsce.
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Information: Technical Transactions, 2019, Volume 1 Year 2019 (116), pp. 93 - 112
Article type: Original article
Titles:
Model tests of global stability of two types of lightning protection masts under wind action
Institute of Structural Mechanics, Cracow University of Technology
Instytut Mechaniki Budowli, Wydział Inżynierii Lądowej, Politechnika Krakowska
Institute of Structural Mechanics, Civil Engineering Faculty, Cracow University of Technology
Published at: 31.01.2019
Article status: Open
Licence: None
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