Abstract
Steel truss towers are important structures in civil engineering, used as, for example, antenna towers, architectural towers, transmission towers, chimney towers, light towers, viewing towers, or water towers. In the paper, the latter structural type is analysed. Three types of truss towers with different topology are discussed. The towers are designed according to the standards. Next, reliability analysis is performed and the influence of type of truss topology on reliability is analysed. Reliability analysis concerns formulation of the limit state, calculation of failure probability and determination of reliability index. In the paper, the system approach is proposed, definitely more complete than that obtained using approximation-simulation methods. In the case of structures analysed in the paper, the types of reliability models are determined. Identification of reliability models relies on studies on the transformation of the safe structural system into the geometrically variable system (mechanism). The investigations made it possible to determine the kinematically admissible failure mechanisms which contain minimal critical sets of elements. In order to identify the mechanism, spectral analysis of the linear stiffness matrix is used. In the case of the towers of concern, the formulas specifying the number of mechanisms for any number of repeating sections are determined.
Highlights
Towers are stand-alone structures rigidly fixed to the base
Antenna towers are tall structures designed to support antennas for telecommunications and broadcasting, architectural towers commemorate historic events, transmission towers support power lines, chimney towers provide support for flue systems, light towers offer the possibility of installing powerful lighting, viewing towers have observation decks providing extensive views, and water towers are used to pressurize a water supply system for water distribution
In order to compare the truss towers with respect to reliability, the reliability index β is computed for each tower of concern taking into account the most disadvantageous arrangement of loads
Summary
Towers are stand-alone structures rigidly fixed to the base. A number of tower types can be distinguished due to their use [1]. Steel truss tower is considered the most effective structural option. Level I, i.e. semi-probabilistic methods involve the verification of structural reliability, but they do not determine the exact failure probability. Semi-probabilistic methods involve the verification of structural reliability, but they do not determine the exact failure probability Level III methods are fully probabilistic and they provide an extension of Level II methods In this case, the cumulative probability distribution of random variables is known. The cumulative probability distribution of random variables is known Another group contains system approach (serial, parallel and mixed systems).
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