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| Nonlinear finite element analysis on the wind-induced vibration of a tension suspension-braced transmission structure |
| LI Zhengliang1,2，WANG Bangjie1，WANG Tao3,4 |
| 1.School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2.Chongqing Key Laboratory of Wind Engineering and Wind Resources Utilization, Ministry of Education, Chongqing University, Chongqing 400045, China;
3.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150040, China;
4.Chongqing Research Institute of Harbin Institute of Technology, Harbin Institute of Technology, Chongqing 401151, China |
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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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Received: 22 November 2022
Published: 28 January 2024
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