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

本文研究的目的是检验输电塔在支承运动作用下的极限强度。对某输电塔地基-基础-结构耦合系统进行了一系列三维非线性有限元分析，以评估施加支承运动对整个系统强度和破坏行为的影响。分析了塔架构件的屈曲和伸长逐渐破坏，并讨论了构件局部破坏与整个体系退化的关系。通过对固定支承的塔体与该体系的比较，发现支承运动对塔体的极限强度和破坏模式有显著影响

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