Effect of bolt joints on behaviour of transmission tower under external loads

doi:10.3969/j.issn.0253-2778.2017.06.008

Abstract

Abstract: To ensure the safe operation of transmission lines, it is necessary to convert metecorological conditions to equvalent external forces in simulation calculations in the design process of transmission tower. The traditional structural finite element analysis methods usually simplify the bolt joints of steel angles as rigid or pinned connections，ignoring the effect of slip and eccentricity. Using ANSYS software, on the basis of an original slip model, an improved slip model was built by further considering bolt joints in tower legs and tower head. Simulation results were compared with the original slip model and two conventional models. The rationality of the model was verified by the dynamic and static measurements of the full scale tower test, enabling the investigation of responses of the maximal working load conditions. It could be found that, the improved slip model optimizes the forecast of the bending modal frequencies and accurately simulates the real deformation and axial force of the transmission tower. The effect of bolt joints is related to the load combination conditions. Consideration of the effect of bolt joints in tower legs and tower head is necessary to the analysis of the most dangerous condition: wire breakage.

Key words: transmission tower, bolt joint, finite element model, maximal working load, mechanical property

CLC Number:

TM753
TU391

YE Min, CHEN Haibo, ZHANG Huiwu, ZHAO Xiuzhen. Effect of bolt joints on behaviour of transmission tower under external loads[J]. Journal of University of Science and Technology of China, 2017, 47(6): 498-507.

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