An Experimental Study on Failure Mechanism of Transmission Tower under Iced Conductor Galloping
Yang Lun;Lou Wen-Juan;Chen Yong;Yan Dong;Yang Xiao-hui
Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (24) : 70-75.
An Experimental Study on Failure Mechanism of Transmission Tower under Iced Conductor Galloping
Based on the similarity theory of dynamic model,a tower segmental model with elastic boundary condition and iced conductor model were founded with large–scale. According to dynamic characteristic of iced conductor galloping, the vibration experimental equipment used to simulate galloping responses of iced-conductor was developed. On the basis of conductor ice thickness and vibration amplitude obtained by field testing, the dynamic experiment of transmission tower-line was carried out under conductor galloping. Combining with the experimental results of dynamic stress, fatigue life of tower member was estimated. It was shown that failure mechanism of tower is not insufficient bearing capacity of members and fatigue damage, the real reason is the connection bolts of members loose under dynamic tension produced by conductor galloping, and make the main components of tower internal force redistribute, thus certain members are destroyed subjected to excessive force , which result in collapse and instability of transmission towers.
iced conductor / transmission tower segmental model / galloping experimental equipment / fatigue failure / bolts looseness. {{custom_keyword}} /
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