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Article

Design Approach on Bearing Capacity of the Cross-Bracing with Different Types of Joint Connection in Steel Lattice Transmission Towers

by
Jiajing Xu
1,
Songyang He
2,*,
Xing Huang
2,
Dagang Han
2,
Xiangyun Liu
2,
Jiubin Sun
1,
Jing Wang
1,
Lu Yao
1 and
Shaofeng Zhang
1,*
1
School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China
2
Southwest Electrical Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Chengdu 610056, China
*
Authors to whom correspondence should be addressed.
Buildings 2024, 14(6), 1784; https://doi.org/10.3390/buildings14061784
Submission received: 9 May 2024 / Revised: 6 June 2024 / Accepted: 11 June 2024 / Published: 13 June 2024
(This article belongs to the Special Issue Low-Carbon and Green Materials in Construction—2nd Edition)
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Abstract

This paper presents an evaluation of the bearing capacity of cross-bracing in steel transmission tower structures. Design guidelines (ASCE 10-15, BS EN 50341-1, GB 50017-2017, and DL/T 5486-2020) related to the buckling capacity of the cross-bracing are summarized and compared with the experimental results. The current design provisions obtained the bearing capacity from the equivalent slenderness ratio, and then the stability coefficient and buckling capacity were derived. The calculated bearing capacity based on the design code tends to be overly progressive for smaller slenderness ratios (particularly those below 100), except for EN 50341-1-2012. Conversely, for larger slenderness ratios, ASCE 10-15 and DL/T 5486-2020 Class A design codes lean towards being overly progressive, while GB 50017-2017 and EN 50341-1-2012 codes tend to be more conservative. The design standard appears to exhibit unsafe predictions for Class A and B connections with low slenderness ratios and Class C connections. It needs to be noted that the effects of torsional stiffness and joint connection type are not considered in the current design codes, which are proved to be nonnegligible by the test results. In this paper, the bearing capacity calculation formula is proposed by introducing a modified effective length coefficient (K), and both the torsional stiffness and joint connection type are taken into account. The modified bearing capacity is verified with the test results; the correlation coefficient is 0.997, and the coefficient of variation is 0.04. It can provide a reference for the engineering design of steel lattice transmission tower structures.
Keywords: steel lattice transmission towers; cross bracing; slenderness ratio; torsional stiffness; design codes steel lattice transmission towers; cross bracing; slenderness ratio; torsional stiffness; design codes

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MDPI and ACS Style

Xu, J.; He, S.; Huang, X.; Han, D.; Liu, X.; Sun, J.; Wang, J.; Yao, L.; Zhang, S. Design Approach on Bearing Capacity of the Cross-Bracing with Different Types of Joint Connection in Steel Lattice Transmission Towers. Buildings 2024, 14, 1784. https://doi.org/10.3390/buildings14061784

AMA Style

Xu J, He S, Huang X, Han D, Liu X, Sun J, Wang J, Yao L, Zhang S. Design Approach on Bearing Capacity of the Cross-Bracing with Different Types of Joint Connection in Steel Lattice Transmission Towers. Buildings. 2024; 14(6):1784. https://doi.org/10.3390/buildings14061784

Chicago/Turabian Style

Xu, Jiajing, Songyang He, Xing Huang, Dagang Han, Xiangyun Liu, Jiubin Sun, Jing Wang, Lu Yao, and Shaofeng Zhang. 2024. "Design Approach on Bearing Capacity of the Cross-Bracing with Different Types of Joint Connection in Steel Lattice Transmission Towers" Buildings 14, no. 6: 1784. https://doi.org/10.3390/buildings14061784

APA Style

Xu, J., He, S., Huang, X., Han, D., Liu, X., Sun, J., Wang, J., Yao, L., & Zhang, S. (2024). Design Approach on Bearing Capacity of the Cross-Bracing with Different Types of Joint Connection in Steel Lattice Transmission Towers. Buildings, 14(6), 1784. https://doi.org/10.3390/buildings14061784

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