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Design recommendations for the stability of transmission steel lattice towers
Graphical abstract Display Omitted
Highlights Numerical simulations of lattice towers made of angle sections are performed. The importance of 2nd order effects developing in these structures is underlined. An instability mode which involving more than one member has been detected. Analytical models to predict the critical load of this mode are proposed/validated.
Abstract Lattice towers are extensively built in Europe and worldwide to serve telecommunication or power transmission purposes. Their members are usually made of equal leg angle profiles that are bolted at their extremities. Such types of towers are mainly designed to EN 1993-3-1 and EN 50341-1, based on a first-order linear elastic structural analysis of a truss structure. In this paper, an assessment of the current design approach is performed, where the tower has been simulated with a full non-linear finite element software, considering relevant imperfections as well as geometrical and material non-linearities. The importance of the second order effects in the analysis is underlined while the existence of an instability mode not properly covered directly by the norms, and usually therefore not checked, is highlighted. Two analytical models for the prediction of the critical load of this buckling mode are proposed and validated numerically. Both proposed models are rather easy to apply and may fill the gap in the existing design recommendations for lattice towers.
Design recommendations for the stability of transmission steel lattice towers
Graphical abstract Display Omitted
Highlights Numerical simulations of lattice towers made of angle sections are performed. The importance of 2nd order effects developing in these structures is underlined. An instability mode which involving more than one member has been detected. Analytical models to predict the critical load of this mode are proposed/validated.
Abstract Lattice towers are extensively built in Europe and worldwide to serve telecommunication or power transmission purposes. Their members are usually made of equal leg angle profiles that are bolted at their extremities. Such types of towers are mainly designed to EN 1993-3-1 and EN 50341-1, based on a first-order linear elastic structural analysis of a truss structure. In this paper, an assessment of the current design approach is performed, where the tower has been simulated with a full non-linear finite element software, considering relevant imperfections as well as geometrical and material non-linearities. The importance of the second order effects in the analysis is underlined while the existence of an instability mode not properly covered directly by the norms, and usually therefore not checked, is highlighted. Two analytical models for the prediction of the critical load of this buckling mode are proposed and validated numerically. Both proposed models are rather easy to apply and may fill the gap in the existing design recommendations for lattice towers.
Design recommendations for the stability of transmission steel lattice towers
Bezas, Marios-Zois (author) / Jaspart, Jean-Pierre (author) / Vayas, Ioannis (author) / Demonceau, Jean-François (author)
Engineering Structures ; 252
2021-11-14
Article (Journal)
Electronic Resource
English
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