Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Wind and Structures Volume 33, Number 4, October 2021 , pages 317-329 DOI: https://doi.org/10.12989/was.2021.33.4.317 |
|
|
|
Member capacity-based progressive collapse analysis of transmission towers under wind load |
||
Yongquan Li, Yong Chen, Guohui Shen, Wenjuan Lou, Weijian Zhao and Hao Wang
|
||
| Abstract | ||
| The wind-induced collapse of transmission towers has raised many concerns. Progressive collapse analysis is recognized as a promising method for the assessment of the collapse-resistant capacity of the transmission tower. The finite element model of an actual transmission tower is firstly built for the analysis, in which the dynamic behavior of the member in failure is taken into account to be in accord with the actual tower collapse. The analysis considering the main design load cases is conducted in advance to determine the case under which the tower has the potential to collapse. The incremental dynamic analysis in association with the explicit time integration algorithm is employed to perform a progressive collapse analysis, where the wind loads are simulated by using the linear filtering method, and the developed failure criterion with axial force and bending moment involved is based on the stability bearing capacity of the members. It is found the tower collapse begins with the horizontal bracing member near the waist. Then, the adjacent members, including the leg members, fail sequentially, and the tower collapses eventually with a shear-type failure. The demand to capacity ratio (DCR) in terms of bearing capacity of the member is defined to quantify the structural behavior, the location of the member that has the potential to fail, and when the initial failure occurs are thereby identified. It is concluded that compared to the member capacity-based analysis, the ultimate strain-based analysis, which is most likely to be an inelastic dynamic analysis permitting a large deformation, may overestimate the bearing capacity of the structure in wind-induced collapse. | ||
| Key Words | ||
| demand to capacity ratio; failure mode; member capacity-based failure criterion; progressive collapse analysis; transmission tower | ||
| Address | ||
| Yongquan Li:College of Civil Engineering and Architecture, Zhejiang University, 886 Yuhangtang Road, Xihu District, Hangzhou, China Yong Chen:College of Civil Engineering and Architecture, Zhejiang University, 886 Yuhangtang Road, Xihu District, Hangzhou, China Guohui Shen:1)College of Civil Engineering and Architecture, Zhejiang University, 886 Yuhangtang Road, Xihu District, Hangzhou, China 2)School of Civil Engineering, Southeast University, 2 Southeast University Road, Jiangning District, Nanjing, China Wenjuan Lou:College of Civil Engineering and Architecture, Zhejiang University, 886 Yuhangtang Road, Xihu District, Hangzhou, China Weijian Zhao:College of Civil Engineering and Architecture, Zhejiang University, 886 Yuhangtang Road, Xihu District, Hangzhou, China Hao Wang:School of Civil Engineering, Southeast University, 2 Southeast University Road, Jiangning District, Nanjing, China | ||