Equivalent static wind load in torsional direction of long cross arm transmission tower

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 125-132.

YANG Ziye, DENG Hongzhou

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Abstract

To investigate the calculation method of equivalent static wind load (ESWL) in torsional direction of long cross arm transmission tower, its multi-DOF torsional vibration equations were derived and solved in frequency domain based on the spring-multi-mass point model. Considering the contribution of the first order torsional mode, the calculation formulas of ESWL in torsional direction were deduced with the inertial wind load (IWL) method. Based on the downwind shape coefficient of tower structure and the quasi-steady theory, the torsional wind load spectrum of tower segment was deduced. Secondly, according to the special geometric configuration and dynamic characteristics of DC transmission tower, a simplified model was proposed to simplify vibration equation and the calculation formula of wind load spectrum. Finally, taking the Zhundong-East China ±1 100 kV angle steel transmission tower as an example, the calculation results for axial force and dynamic time history analysis of main materials, inclined ones and diaphragm ones of the transmission tower obtained using the proposed method were compared with those obtained using the method of our country code. The results showed that compared with the method of our country code, the proposed method can improve the design reliabilities of main materials, inclined ones and diaphragm ones, especially, the reliabilities of the tower body’s inclined materials and diaphragm ones increase greatly, they can reach 98.5% and 89.8%, respectively.

Key words

long cross arm transmission tower / equivalent static wind load (ESWL) / torsional effect / inertial wind load (IWL) method

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YANG Ziye, DENG Hongzhou. Equivalent static wind load in torsional direction of long cross arm transmission tower[J]. Journal of Vibration and Shock, 2021, 40(3): 125-132

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