Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers

WU Hainan; XIE Qiang; LI Yue; WU Minger; YAN Cong

doi:10.3969/j.issn.0258-2724.20240435

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WU Hainan, XIE Qiang, LI Yue, WU Minger, YAN Cong. Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240435

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WU Hainan, XIE Qiang, LI Yue, WU Minger, YAN Cong. Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240435

Citation:

WU Hainan, XIE Qiang, LI Yue, WU Minger, YAN Cong. Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240435

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Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers

doi: 10.3969/j.issn.0258-2724.20240435

WU Hainan^1
,,
XIE Qiang^{1, 1
,
,},
LI Yue²,
WU Minger¹,
YAN Cong¹

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
China Nuclear Industry Huaxing Construction Co., Ltd., Nanjing 200019, China

Received Date: 03 Sep 2024
Accepted Date: 30 Dec 2024
Rev Recd Date: 02 Oct 2024

Available Online: 13 Jan 2025

Abstract

Abstract

To optimize the T-shaped retrofitting scheme of diagonal members, the influence of structural and material parameters on the bearing capacity of the members after retrofitting was investigated through theoretical analysis, experimental study, and finite element analysis. Firstly, a theoretical model of the T-shaped retrofitting section was established based on the composite beam theory, so as to analyze the improvement in flexural stiffness after T-shaped retrofitting. Secondly, eccentric compression static experiments of single-side connected angle steels for T-shaped retrofitting were conducted. Finally, the finite element model was used to analyze the effects of the slenderness ratio, width-to-thickness ratio, and material strength on the selection of the number of connectors. The results indicate that the improvement in flexural stiffness after T-shaped retrofitting decreases with increasing load. A decrease in the number of connectors leads to relative slip perpendicular to the direction of member deformation. For the experimental members, an increase in the number of connectors leads to greater bearing capacity, with a maximum retrofitting effect of 100.4%. For the T-shaped retrofitting scheme of diagonal members, two connectors are sufficient when the slenderness ratio is below 150. Otherwise, three connectors are required. The width-to-thickness ratio and material strength have no effect on the selection of connectors.
- single-side connected diagonal member,
- T-shaped retrofitting scheme,
- retrofitting scheme,
- composite beam theory,
- static experiment,
- parameter analysis

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