The structural effect of bolted splices on retrofitted transmission tower angle members

Lu, Chenghao; Ma, Xing; Mills, Julie E.

doi:10.1016/j.jcsr.2013.12.011

Cited by 34 publications

(9 citation statements)

References 11 publications

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“…Because of their characteristics, including their geometric nonlinearity and closely spaced modes of vibration, the dynamic behavior of transmission lines has significant effects on the wind-induced vibration response of transmission towers. Damage to highvoltage overhead transmission lines caused by environmental impacts, especially by wind-induced vibration, has been an important issue for engineers and researchers in the power industry throughout the world [1][2][3][4][5][6][7][8]. Since the introduction of the first high-voltage transmission lines, this issue has been studied continually, but reasonable solutions have not yet been obtained.…”

Section: Introductionmentioning

confidence: 99%

Wind-Induced Coupling Vibration Effects of High-Voltage Transmission Tower-Line Systems

Zhang

Zhao

Wang

et al. 2017

Shock and Vibration

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A three-dimensional finite element model of a 500 kV high-voltage transmission tower-line coupling system is built using ANSYS software and verified with field-measured data. The dynamic responses of the tower-line system under different wind speeds and directions are analyzed and compared with the design code. The results indicate that wind speed plays an important role in the tower-line coupling effect. Under the low wind speed, the coupling effect is less obvious and can be neglected. With increased wind speed, the coupling effect on the responses of the tower gradually becomes prominent, possibly resulting in the risk of premature failure of the tower-line system. The designs based on the quasi-static method stipulated in the current design code are unsafe because of the ignorance of the adverse impacts of coupling vibration on the transmission towers. In practical engineering, when the quasi-static method is still used in design, the results for the design wind speed should be multiplied by the corresponding tower-line coupling effect amplifying coefficient .

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Section: Introductionmentioning

confidence: 99%

Wind-Induced Coupling Vibration Effects of High-Voltage Transmission Tower-Line Systems

Zhang

Zhao

Wang

et al. 2017

Shock and Vibration

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Section: Test Resultsmentioning

confidence: 99%

“…Numerous reported tests have shown that relative slip of bolted joints in connected steel angles is very common in lattice transmission tower legs, because of the bolt hole clearances and insufficient preload. 20,21 Such joint effects indicate that the tensile strength material data obtained from standard coupon tests cannot be used directly to predict the joint strength. Therefore, the data obtained from the material test needs to be processed, with consideration of bolt joint slip effects to accurately predict the mechanical strength of the leg member joints.…”

Section: Joint Strength Calculation Methods Considering Joint Slipmentioning

confidence: 99%

Experimental research on bolted joint strength and dispersion in steel lattice transmission tower legs under low temperatures (−20°C to −45°C)

Jiang

Zhang³

et al. 2019

Fatigue Fract Eng Mat Struct

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Cold regions with subzero temperatures (−20°C to −45°C) have important impacts on the mechanical properties of structural steel used in lattice steel towers of overhead transmission line systems. The results from regular material tests are not appropriate for the accurate analysis of joint strength in cold weather conditions. This paper presents the tensile test results of 18 coupons of steel material and eight groups (18 specimens per group) of bolted joints with Q345 and Q420 steel under temperatures of 20°C, −20°C, and −45°C. The results show that the yield‐to‐ultimate strength ratio of the joints under low temperature conditions is beyond the range of 0.60 to 0.75 for Q420 structural steel. Suggestions are made on how to improve the accuracy of joint design for both the partial resistance factor and the design value of joint yield strength in cold regions.

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“…ABAQUS has been used for designing numerical models to make a pretense of experimental tests and in a parametric study, then they used the number of verified models. Depending on both the experimental and numerical test results, they found the assembly specification affecting the load shifting behavior, Figure 20, displays failure mode of CTC section type [24].…”

Section: Figure 18 Methods Of Retrofittingmentioning

confidence: 99%

Evaluation of Seismic Performance of Steel Lattice Transmission Towers

Albayrak

Morshid

2020

Civ Eng J

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The electricity transmission systems are an important lifeline for modern societies. They are used for overhead power lines as supporting structures. Transmission towers are designed to meet electrical and structural requirements. They are designed according to the weight of conductors and environmental effects such as wind and ice loads. They also considered other extraordinary stresses such as cable breakage and ice-breaking effects. Because of a common perception that transmission line (TL) towers show low sensitivity to earthquakes, the effects of the earthquake in TL tower construction are not considered. For this reason, TL towers are investigated with regard to the seismic performance in this study. The principal objectives of this research are: i) to assess the sensitivity of typical TL towers to earthquake loads, ii) to retrofit an existing steel lattice tower using a new section Centre To Center (CTC). In this study, a finite element model of a representative 154 KV transmission tower in Turkey was performed using a set of 10 recorded earthquake ground movements. The four-legged square TL tower has been analyzed and designed for Turkey, Eskisehir seismic zone considering 42.95 m height using finite element (FE) software. Therefore, a new section Centre To Center (CTC) type has been designed and the failed sections have been replaced with a designed section using the SAP2000 section designer. The results show that the load of failure increased after retrofitting. The retrofitting method was effective and easily conducted in fields. Doi: 10.28991/cej-2020-03091600 Full Text: PDF

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The structural effect of bolted splices on retrofitted transmission tower angle members

Cited by 34 publications

References 11 publications

Wind-Induced Coupling Vibration Effects of High-Voltage Transmission Tower-Line Systems

Wind-Induced Coupling Vibration Effects of High-Voltage Transmission Tower-Line Systems

Experimental research on bolted joint strength and dispersion in steel lattice transmission tower legs under low temperatures (−20°C to −45°C)

Evaluation of Seismic Performance of Steel Lattice Transmission Towers

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