Abstract
In this research, the response of high voltage transmission towers under wind load patterns is discussed from the point of view of structural reliability. The paper focuses the attention on the response of two existing tension towers that are part of the 400 kV circuit at the perimeter of Mexico City. Two hundred nonlinear pushover analyses were carried out in detailed models in order to study peak demands in the critical structural elements in tension, compression and in the critical support to establish the vulnerability as a function of the: i) variability of the lateral load pattern and ii) the material overstrength from commercial profiles available in the local market. Based on the results, the global buckling of the elements in the mid-height led to a fragile collapse mechanism, regardless of the applied loading profile. This observation represents a research opportunity in the design practice for the existing towers. The study identifies a dependency between the collapse mechanism and the structure height, which is not currently considered by the specialized codes.
Published Version
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