Materiały konferencyjne, referaty (WBAIŚ)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/151

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20212

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Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Reinforcement of Lattice Tower Legs Made of Angle Sections
    (Wydawnictwo Politechniki Łódzkiej, 2021) Szafran, J.; Telega, J.
    The main goal of this paper is to present the results of the buckling resistance analysis of two types of unconventional reinforcement of legs of a telecommunications tower by means of equal-leg angle sections. The key reinforcing elements are round solid bars that are connected with the angle section in various ways. Two types of connection between an existing leg and reinforcing elements were considered: stiff (welded) and frictional (based on friction between round solid bars and sheet plates around them). The reinforced element was loaded by a surface force applied at the upper end of the angle section. The paper discusses the impact of how the reinforced and reinforcing elements were connected on the value of the critical force. For the frictional connection, it was also shown how environmental conditions (wet or dry) and the resulting friction coefficient influence the form of buckling and the failure mechanism. Calculations were made with FEM numerical analysis using the FEMAP software.
  • Pozycja
    Comparative Analysis of the Resistances of Uniplanar Joints in Lattice Structures
    (Wydawnictwo Politechniki Łódzkiej, 2021) Majtka, J.; Gajdzicki, M.; Supeł, Ł.
    The aim of the study is to compare the design resistance of selected planar K-type joints in lattice girders, made of square hollow sections. A comparative analysis was carried out using three methods: Eurocode 1993-1-8 (EC3) application rules, the FEM method using Autodesk Robot Structural Analysis software, and the CBFEM method using Idea Statica software. The resistance of lattice joints depends on many parameters and the range of possible cases seems to be infinite. Therefore, the study was limited to investigating the influence of the variation of the four geometrical parameters of the nodes. The research also reports and discusses the differences in the results obtained from the three methods mentioned above and shows that there is a need to extend the provisions of the EC3 standard with additional cases that may occur when designing lattice structures.