Design method of aeroelastic model for long-span transmission tower-line system

Abstract

A design method of an aeroelastic model for a long-span transmission tower-line system is disclosed. On the basis of boundary layer wind tunnel test data of a rigid model, a finite element model is utilized to calculate that relaxed Froude number similarity criterion of transmission towers, the influence of the elastic stiffness of a transmission line and two kinds of variable proportion transmission line models upon wind-induced response is changed, an aeroelastic model with long span is designed. The influence of material nonlinearity and gradient wind height of concrete filled steel tube onwind-induced response is further analyzed by the finite element model. The method has the advantages that the aeroelastic model of long span can be reasonably designed by increasing the elastic stiffness of the transmission line and adopting an accurate line length similarity ratio; consideration of the material nonlinearity of concrete-filled steel tubes has little effect on wind-induced response at design wind speed, and the wind-induced response decreases when considering the gradient wind height.

Description

technical field [0001] The invention relates to the technical field of transmission line model design, in particular to an aeroelastic model design method for a large-span transmission tower line system. Background technique [0002] Under the action of wind load, due to the coupled movement of conductors and transmission towers, the coupling of fluid and moving structures, and the coupling between three-dimensional aerodynamic forces, the long-span transmission tower-line system becomes a rather complex coupled flexible system. The aeroelastic model wind tunnel test is an effective means for in-depth study of various wind-induced coupled vibration phenomena. [0003] Some professionals made a rigid model to simulate the shape of a lattice transmission tower, and studied the influence of parameters such as density, wind direction angle, and wind attack angle on the drag coefficient through wind tunnel tests, and proposed a calculation formula for the drag coefficient. Howeve...

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Problems solved by technology

[0006]In the existing technology, in order to make the model feasible, it is necessary to relax the Froude number similarity criterion of the Sutong large-span transmission tower model; based on the principle of the same wind speed, the transmission line The model does not satisfy the Strouhal number (Strouhal number) similarity criterion, and thus the aerodynamic damping does not satisfy the theoretical similarity ratio; if the vertical-span ratio of the transmission line is large, the aerodynamic resistance of the model will be different from the theoretical one if the traditional variable-scale transmission line model design is used The error of the value is greater than 5%; the main material of the tower body is made of steel pipe concrete, and the concrete will fail due to tension under high wind speed, which may affect the accuracy of the experimental results; it is difficult for the wind tunnel laboratory to simulate the wind profile above the gradient wind height, and the wind The hole test results are inaccurate, and the influence of gradient wind height is not considered

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