详情

原文传递 Static and Dynamic Response Characteristics of a Full-Scale Long-Cantilever Tower under Various Loading Conditions

题名：	Static and Dynamic Response Characteristics of a Full-Scale Long-Cantilever Tower under Various Loading Conditions
正文语种：	eng
作者：	Xing Fu;Zhi-Xuan Tan;Hong-Nan Li;Gang Li
作者单位：	Dalian Univ. of Technology;Dalian Univ. of Technology;Dalian Univ. of Technology;Dalian Univ. of Technology
关键词：	Long-cantilever transmission tower;Full-scale test;Ultimate bearing capacity;Modal parameters;Dynamic failure process
摘要：	Abstract Long-cantilever transmission towers are drawing more and more attention in ultrahigh-voltage (UHV) transmission projects. To meet the requirements of high-voltage safety clearance, the structural characteristics of long-cantilever transmission towers are significantly different from traditional ones. Aiming to ensure the safety of long-cantilever transmission towers during service, this paper investigates their static and dynamic characteristics under various extreme loading conditions based on full-scale tests and numerical simulation. With the strain data tested in seven typical cases, the bending moments and axial forces of the main members were back-calculated and the initial imperfections were calculated based on these results. Using a stochastic subspace identification algorithm, the evolution of the modal parameters during the full-scale test was revealed. The damage position of the main members was identified according to the mode shape changes, and the dynamic collapse process was analyzed via the measured dynamic responses and recorded videos. Numerical simulation was conducted in ANSYS using the calculated initial imperfections, and the results were in good agreement with the full-scale test. The results show that torsion action was not dominant for this tower and the failure mode was still the bending failure at the tower body. The proposed imperfection quantification method makes up for the deficiency of the empirical values, and using experimental results to guide numerical simulation proves practical. The modal parameters vary greatly under different loading conditions, which can be attributed to the damage after each loading case.
出版年：	2023
期刊名称：	Journal of structural engineering
卷：	149
期：	5
页码：	05023002.1-05023002.15