Techno Press
Techno Press

Earthquakes and Structures   Volume 15, Number 6, December 2018, pages 583-593
DOI: http://dx.doi.org/10.12989/eas.2018.15.6.583
 
Influence of multi-component ground motions on seismic responses of long-span transmission tower-line system: An experimental study
Li Tian, Ruisheng Ma, Canxing Qiu, Aiqiang Xin, Haiyang Pan and Wei Guo

 
Abstract     [Full Text]
    Seismic performance is particularly important for life-line structures, especially for long-span transmission tower line system subjected to multi-component ground motions. However, the influence of multi-component seismic loads and the coupling effect between supporting towers and transmission lines are not taken into consideration in the current seismic design specifications. In this research, shake table tests are conducted to investigate the performance of long-span transmission towerline system under multi-component seismic excitations. For reproducing the genuine structural responses, the reduced-scale experimental model of the prototype is designed and constructed based on the Buckingham\'s theorem. And three commonly used seismic records are selected as the input ground motions according to the site soil condition of supporting towers. In order to compare the experimental results, the dynamic responses of transmission tower-line system subjected to single-component and two-component ground motions are also studied using shake table tests. Furthermore, an empirical model is proposed to evaluate the acceleration and member stress responses of transmission tower-line system subjected to multi-component ground motions. The results demonstrate that the ground motions with multi-components can amplify the dynamic response of transmission tower-line system, and transmission lines have a significant influence on the structural response and should not be neglected in seismic analysis. The experimental results can provide a reference for the seismic design and analysis of long-span transmission tower-line system subjected to multi-component ground motions.
 
Key Words
    long-span transmission tower-line system; shake table tests; multi-component ground motions; empirical model
 
Address
Li Tian, Ruisheng Ma, Canxing Qiu, Aiqiang Xin, Haiyang Pan: School of Civil Engineering, Shandong University, Jinan, Shandong, 250061, China
Wei Guo: School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2019 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: technop@chol.com