Analysis Of The Reinforcement Measures On Weak Parts Of 110kV Transmission Towers Under The Typhoon

As a carrier to deliver the electrical energy,the transmission line system relates to the steady development of our country directly.Since the geometric nonlinearity between the cable and the insulator and the coupling between the cable and the transmission tower,the excessive vibration is likely to occur in transmission towers under the strong wind.Especially under the typhoon,it is extremely easy to make the bar of the transmission tower fracture,and even make the whole structure collapse because of the vibration response.Since the grim reality of the transmission tower’s destruction under the strong wind,an investigation of the phenomenon about the wind-induced destruction of transmission towers is made in this paper,and finite element software ANSYS is used to model the 110 kV transmission towers and do the static analysis and the model analysis,which can help us learn where the weak part of transmission towers is.Then,the paper proposes the effective reinforcement schemes to reinforcement the transmission towers.What’s more,the paper explores the effectiveness of the schemes with ANSYS.The paper is divided into such parts as follows:Firstly,the paper researches on the finite element modeling method of 110 kV transmission towers and establishes the refinement three-dimension finite element modals of 110 kV transmission towers –ZGU302,ZM1 and ZM4 with ANSYS.Secondly,the paper makes an investigation of the phenomenon about the wind-induced destruction of transmission towers,and does the statics analysis and modal analysis on 110 kV transmission towers-ZGU302,ZM1 and ZM4 with ANSYS.By the above,the paper gets the weak parts of 110 kV transmission towers under the typhoon loads.Thirdly,combined with the weak parts of 110 kV transmission towers under the typhoon loads,this paper proposes different reinforcement schemes of 110 kV transmission towers-ZGU302 ZM1 and ZM4.The optimal reinforcement scheme is selected in a variety of solutions by doing the statics analysis and modal analysis with ANSYS.Scheme 3 is the optimal for ZGU302,which adds three diaphragm surfaces to the tower(one is in the middle part,the others are in the lower part),and adds diagonal brace to the lower part.Scheme 4 is the optimal for ZM1,which adds seven new diaphragm surfaces to the tower(four are in the first segment,the others are in the second segment),and adds diagonal brace to in the first segment.Scheme 2 is the optimal for ZM4,which adds three diaphragm surfaces to the lower part.Fourthly,the paper does the dynamic analysis on the transmission towers which has been reinforced by the optimal reinforcement scheme with ANSYS.Compared with the original transmission towers,the maximum tensile stress and the maximum compressive stress have decreased,and the displacement of the outer surface in the lower part of the tower has been effectively controlled.At last,the paper does the stability analysis on the transmission towers which has been reinforced by the optimal reinforcement scheme with ANSYS.Compared with the original transmission towers,the buckling coefficient has increased,and the nonlinear stability has improved.