| The development of power system puts forward new requirements for the design of transmission towers.Aluminum alloy materials are ideal materials for transmission tower construction because of their light weight,good corrosion resistance and no obvious low temperature cold brittleness.Because the collapse of the transmission tower is frequent,and the elastic modulus of the aluminum alloy material is lower than that of the steel,the wind stability problem of the aluminum alloy transmission tower is more prominent.At present,the research on aluminum alloy transmission towers at home and abroad is not deep enough,and most of them stay in the exploration of possibilities.Based on the above background,this paper designs an aluminum alloy transmission tower and explores its failure mechanism and weak structural parts under wind load to provide support for practical engineering design.Study in this paper presents the following parts of work:(1)election of aluminum alloy transmission towerAccording to the environmental conditions and power demand of the transmission tower construction,the design of the aluminum alloy transmission tower was carried out,and the model was established by using the finite element software.The basic model of the transmission tower suitable for the 6082 T6 aluminum alloy material was selected by comparison.The shape control parameters of the four types of transmission towers,such as follow-up,slope,diagonal bracing and cross-sectional arrangement,were selected to optimize the parameters,and the optimized tower type was compared with the common iron tower type to verify the necessity of parameter optimization.Sexuality and rationality provide a reference for engineering design.(2)Analysis of Stable Bearing Capacity of L-Shaped Single-Edge Connection Aluminum Alloy MembersThe numerical simulation method for the stable bearing capacity of L-section single-edge connection for aluminum alloy transmission tower is established.The correctness of the method is proved by comparing the specifications and test values.For the current stage,several common-size L-sections are used in the transmission line.The parameter analysis was carried out,and the curve fitting was carried out by least squares method.A practical calculation method for the single-edge connection stability bearing capacity of L-shaped cross-section members for aluminum alloy transmission tower was established.(3)Mechanism analysis of wind-resistant failure considering double nonlinear structureThe optimized aluminum alloy transmission tower structure model is established and the section design is carried out.For the wind load which is easy to cause the tower to collapse,the wind load and the wind load under the ice condition are used to carry out the stable bearing capacity under two different working conditions.The calculation,and through the parameter analysis to explore its failure mechanism,find out the instability law and weak parts of the transmission tower,and finally give the design recommendations for the stability of the aluminum alloy transmission tower. |
PDF Full Text Request