Analysis on Stability Bearing Capacity of Steel Tubular Members Considering Semi-Rigid Joints in Transmission Towers

Dengke Yu; Jingbo Yang; Zhengliang Li; Zhengqi Tang; Haibing Wu

doi:10.13206/j.gjgS2112301

Volume 37 Issue 5

Sep. 2022

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Dengke Yu, Jingbo Yang, Zhengliang Li, Zhengqi Tang, Haibing Wu. Analysis on Stability Bearing Capacity of Steel Tubular Members Considering Semi-Rigid Joints in Transmission Towers[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(5): 36-43. doi: 10.13206/j.gjgS2112301

Citation:

Dengke Yu, Jingbo Yang, Zhengliang Li, Zhengqi Tang, Haibing Wu. Analysis on Stability Bearing Capacity of Steel Tubular Members Considering Semi-Rigid Joints in Transmission Towers[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(5): 36-43. doi: 10.13206/j.gjgS2112301

Citation:

Dengke Yu, Jingbo Yang, Zhengliang Li, Zhengqi Tang, Haibing Wu. Analysis on Stability Bearing Capacity of Steel Tubular Members Considering Semi-Rigid Joints in Transmission Towers[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(5): 36-43. doi: 10.13206/j.gjgS2112301

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Analysis on Stability Bearing Capacity of Steel Tubular Members Considering Semi-Rigid Joints in Transmission Towers

doi: 10.13206/j.gjgS2112301

1. Electric Power Planning & Engineering Institute Co., Ltd., Beijing 100120, China;
2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
3. Central Southern China Electric Power Design Institute Co., Ltd., of China Power Engineering Consulting Group, Wuhan 430071, China

Received Date: 2021-11-23

Abstract

Abstract

The connection form of the steel tubular members in transmission towers should be the semi-rigid connection which falls in between rigid and pinned connections.Therefore,studying the bearing capacity of steel tubular members of semi-rigid connection is more suitable for the actual loading case.Accordingly,semi-rigid characteristics of K-joints in transmission tubular towers were studied and the finite element (FE) analysis on the stability bearing capacity of steel tubular members under axial compression load considering semi-rigid joints in transmission towers was carried out.First,based on the original model of the transmission tower in actual engineering,the FE model of the K-joint was established.Additionally,the influence,including the dimension of main chord,the axial compression ratio of main chord,the angle between the main chord and the bracing member,the thickness of the gusset plate,the number of the bolts,the thickness and width of the inserted plate,the length and dimension of the bracing member,and the strength of steel,on semi-rigid characteristics of K-joint was analyzed.Moreover,the approximate range of the initial rotational stiffness of K-joints was summarized.Then,based on the study of semi-rigid characteristics of K-joints,the FE analysis on the stability bearing capacity of steel tubular members under axial compression load considering semi-rigid joints was conducted.In addition,the effect of the rotational stiffness,the form of end connection,and the steel grade on steel tubular members with the varied slenderness ratio under axial compression load was investigated.Besides,the stability-coefficient-slenderness-ratio curve between design codes and analysis results was compared.
Results show that the failure of K-joints is exhibited at the compressional area of gusset plate and the inserted plate of compression bracing member.The moment-rotation relationship of the compression steel tubular member of K-joints is nonlinear.The thickness of gusset plate,the number of bolts,the thickness and width of inserted plate,the length and dimension of the bracing member,and strength of steel have a much influence on its semi-rigid characteristics,while the dimension of main chord,the axial compression ratio of main chord,the angle between the main chord and the bracing member have a little influence on that.The range of the initial rotational stiffness of K-joints was about 247.89-983.67 kN·m/rad.In addition,the stability bearing capacity of steel tubular members considering semi-rigid joints is higher than that with hinged connection,and the difference between them is increased with the increasing of the slenderness ratio.When the slenderness ratio is larger than 80,the difference is higher than 10%.When he slenderness ratio is larger than 140,the difference is higher than 20%.It indicates that the larger slenderness ratio is and the stronger end restraint effects are.The mid-span displacement of steel tubular members considering semi-rigid joints is less than that with pinned connections,which means that semi-rigid restraints can decrease the deformation of steel tubular members.The rotational stiffness,the form of connection,and the strength of steel can have an influence in different degree on the stability bearing capacity of steel tubular members considering semi-rigid joints.
- transmission tower,
- semi-rigid connection,
- K-joint,
- steel tubular member,
- stability bearing capacity

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References(24)

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