| The transmission tower is a key component of the transmission line.The reliability of the transmission tower will directly affect the overall safety of the transmission line.According to the transmission tower design specification,the wind load is calculated based on the static wind characteristics specified in the code.However,in recent years,there have been incidents of transmission tower collapse,and it is necessary to re-estimate its reliability.Therefore,the article selects the tower type widely used in the coastal area of Guangdong,and conducts a study on the overall reliability of the transmission tower's wind resistance.This paper focuses on the analysis of the statistical parameters of the equivalent random static wind load and the expression of the probability distribution model of the equivalent static wind load during the design reference period.According to the literature research data,the overall reliability evaluation method of the structure and the wind-induced stress characteristics of the transmission tower are considered.The overall index of the transmission tower can be evaluated by the overall reliability moment method.Through the overall reliability moment method and the equivalent static wind approximation method for the wind load,and using the failure function function of the tower structure under the overall yield,the overall reliability index acting on the tower after the wind load is equivalent is obtained.The system local critical strength branch and bound method is adopted to search and search the weakest failure mode of ZY2-27 tower.The finite element software AN SYS is used to model the target transmission tower,and the branch-reduction method is used to analyze the first five-order failure candidate units of the tower structure at the initial reduction coefficients of 1.2 and 1.5,and The efficiency of the coefficients is compared,and the APDL command flow control based on the finite element software ANSYS for searching and searching for the failed members of the tower is completed.Viewing the positions of the failed candidate members identified by the different reduction coefficients in the overall transmission tower structure,the rod failure principle of the target transmission tower is obtained.The article combines the branch and bound method to search and obtain the stage failure element set,and then analyzes the position of each member in the... |
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