Development Of Evaluation Software For Wind Resistance Of Transmission Line

Due to the rapid growth of power demand in China,the transmission network is developing in the direction of large capacity,large current,high voltage and long distance transmission.Existing transmission tower wind resistance design software and general finite element software are difficult to complete rapid wind resistance assessment of large-scale transmission lines.This paper develops a software that has simple pre-processing and can quickly evaluate the wind resistance of transmission towers.First,a combined buckling simulation unit was proposed to simulate the buckling instability of slender steel members.The simulation unit was written in MATLAB to simulate the simulation unit,and applied to the static pushover analysis and collapse simulation of transmission towers.The simulation unit is based on the basic theory of finite element and uses macroscopic plastic hinges to simulate the nonlinearity of the material of the support unit.The correctness of the self-programming program is verified by comparing the calculation results of the self-programming program with the ABAQUS software;the experimental data of the steel support is selected and the hysteretic curve of the member under different constraints is simulated by the combined buckling element,which verifies The accuracy of the simulation unit;the combined buckling unit is used to simulate the transmission tower collapse test.The results show that the combined buckling unit can effectively predict the stable bearing capacity and failure position of the transmission tower,which verifies the applicability of the simulation unit.Secondly,the static catenary equation method is used to calculate the shape of the conductor and the ground wire,the rod element considering the geometric nonlinearity is used to simulate the conductor and ground wire of the transmission tower tower line system,and the self-programming is used to simulate the static analysis and dynamic time Process analysis and comparison with general finite element software to verify the accuracy and precision of the wire element model.Then,write a program to automatically select the load point of the wind load,calculate the projected area of the wind load,and assemble the wind load based on the overhead transmission line load specification.Finally,combined with the actual needs of the project,a wind resistance assessment software for transmission line was developed.Only by inputting the basic structural parameters of the transmission tower line and the basic data of wind load,the software can automatically carry out the assembly of the transmission tower line structure,modal analysis,wind Load calculation,and structural pushover analysis and collapse simulation to obtain wind resistance evaluation results of the transmission tower tower line structure.