AUTHOR=Zhang Jian , Wu Guangchen , Yang Lidong 

TITLE=Numerical study on hysteretic characteristics of transmission tower K-joints

JOURNAL=Frontiers in Materials

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.1116490

DOI=10.3389/fmats.2022.1116490

ISSN=2296-8016

ABSTRACT=<p><bold>Introduction:</bold> The mechanical properties of joints have a significant impact on the dynamic response of transmission tower structures.</p><p><bold>Methods:</bold> Considering bolt slip, the numerical model of the transmission tower K-joint is established. The mechanical properties of K-joints are studied from three aspects: failure mode, load-displacement hysteretic curve, and stiffness degradation by numerical method. The effects of bolt preload, friction coefficient, and member strength on the hysteretic properties of the K-joint are analyzed.</p><p><bold>Results:</bold> The results show that due to the complexity of K-joints, bolt slip will lead to the reduction of ultimate bearing capacity and the change of failure position. In order to accurately obtain the mechanical properties of K-joints, the influence of bolt slip should be considered in the research process; The plumpness of load-displacement hysteretic curve is greatly affected by parameters; The stiffness of K-joints degenerates with the increase of loading times.</p><p><bold>Discussion:</bold> The results provide a reference for the mechanical analysis of the transmission tower.</p>