Evaluation of ultimate behavior of transmission tower subjected to unequal support movement by advanced computational geomechanics

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The objective of this research is to examine the ultimate strength of transmission tower subject to support movement. A series of three-dimensional nonlinear finite element analyses is performed for a soil-foundation-structure coupled system of the transmission tower to evaluate the effect of an imposed support movement on the strength and failure behavior of the entire system. The progressive failure of the members of the tower due to buckling and elongation is examined, and, moreover, the correlation between the local failure of the members and the degradation of the entire system is also discussed. Comparison between the tower with fixed supports and the system reveals that the support movement has a significant influence on the ultimate strength and the failure mode of the tower