Nonlinear finite element analysis on the wind-induced vibration of a tension suspension-braced transmission structure

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 71-78.

LI Zhengliang1,2，WANG Bangjie1，WANG Tao3,4

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Abstract

The tension suspension-braced transmission structure is a new type of transmission structure suitable for mountainous terrain, which is sensitive to wind load. In this regard, a nonlinear finite element analysis model of wind-induced vibration is proposed for the transmission structure, and the wind-induced vibration response of the structure is analyzed. Firstly, the tangent stiffness matrix of the three-dimensional rod element for the bracing suspension and transmission line, considering the geometric nonlinearity of structures, is derived through the relationship between the element strain energy and its displacement. Subsequently, the element mass matrix and damping matrix of the bracing suspension and transmission line, as well as the element nodal load vector obtained from wind load equivalence are given. Then, based on the nonlinear finite element theory, the nonlinear dynamic equation of wind-induced vibration is established for the tension suspension-braced transmission structure and solved by Newmark-β method combined with Newton-Raphson iterative method. Finally, the two-span tension suspension-braced transmission structure is selected as an example, and the wind-induced nonlinear vibration is analyzed through the proposed model. The results show that: 1) the proposed model has high computational accuracy and efficiency. 2) The low order natural frequency of the suspension-braced conductor part is lower than that of the suspension-braced ground line part. 3) Transmission line displacement response of the structure is greatly affected by wind load. 4) Wind speed and wind direction angle have significant effects on the lateral displacement of transmission line and the suspension tension.

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transmission structure / suspension-braced / wind-induced vibration / nonlinear finite element

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LI Zhengliang1,2，WANG Bangjie1，WANG Tao3,4. Nonlinear finite element analysis on the wind-induced vibration of a tension suspension-braced transmission structure[J]. Journal of Vibration and Shock, 2024, 43(2): 71-78

References

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