Overall Reliability Analysis of Transmission Towers with Asymmetrical Legs Based on Sample Moment and Maximum Entropy Method

WANG Cheng; WANG Tao; HUANG Xing; LIU Xiangyun; LI Zhengliang; LIU Chang

doi:10.3969/j.issn.0258-2724.20230105

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Journal of Southwest Jiaotong University > 2025 >

WANG Cheng, WANG Tao, HUANG Xing, LIU Xiangyun, LI Zhengliang, LIU Chang. Overall Reliability Analysis of Transmission Towers with Asymmetrical Legs Based on Sample Moment and Maximum Entropy Method[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230105

Citation:

WANG Cheng, WANG Tao, HUANG Xing, LIU Xiangyun, LI Zhengliang, LIU Chang. Overall Reliability Analysis of Transmission Towers with Asymmetrical Legs Based on Sample Moment and Maximum Entropy Method[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230105

Citation:

WANG Cheng, WANG Tao, HUANG Xing, LIU Xiangyun, LI Zhengliang, LIU Chang. Overall Reliability Analysis of Transmission Towers with Asymmetrical Legs Based on Sample Moment and Maximum Entropy Method[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230105

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Overall Reliability Analysis of Transmission Towers with Asymmetrical Legs Based on Sample Moment and Maximum Entropy Method

doi: 10.3969/j.issn.0258-2724.20230105

1.
Southwest Electric Power Design Institute Co., Ltd., China Electric Power Engineering Consulting Group, Chengdu 610021, China
2.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
3.
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150040, China
4.
Chongqing Research Institute of Harbin Institute of Technology, Chongqing 401151, China

Received Date: 09 Mar 2023
Rev Recd Date: 28 Aug 2023

Available Online: 26 Feb 2025

Abstract

Abstract

To accurately assess the overall safety of transmission towers with asymmetrical legs, a refined numerical model for a transmission tower with asymmetrical legs was established based on a 500 kV transmission line project. Based on the Technical Specification for the Design of Steel Supporting Structures of Overhead Transmission Line (DL/T 5486—2020) and numerical results, functional expressions for different failure modes of the transmission tower with asymmetrical legs were derived, and these were equivalently described using the principle of equivalent extreme value events. Subsequently, random sample points were generated based on the low discrepancy sequence method, and the sample responses were calculated to obtain statistical moments of the equivalent functional expressions. Finally, the overall reliability index of the transmission tower with asymmetrical legs was calculated using the improved maximum entropy method. The results show that the relative error and computational cost of the overall reliability index of the transmission tower with asymmetrical legs obtained by this method are 0.46% and 0.05%, respectively, compared with the Monte Carlo simulation (MCS) method. The reliability index derived from a single failure mode is lower than the overall reliability index of the transmission tower with asymmetrical legs, suggesting that the latter is more accurate for the safety assessment of transmission towers with asymmetrical legs. Moreover, there is an inverse relationship between the difference in tower leg lengths and the overall reliability index of the transmission tower with asymmetrical legs. Specifically, the overall reliability index of a transmission tower with a 16-meter leg length difference is 15.72% lower than that of a transmission tower with equal-length legs. Therefore, it is recommended to avoid excessive leg length differences during the design phase.
- transmission tower with asymmetrical leg,
- overall reliability,
- sample moment,
- improved maximum entropy method,
- tower leg length difference

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References

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