Research On Dynamic Response Of Composite Materials Tower Structure And Tower-line System

Transmission tower is an important part of power transmission system, it is the carrier of high load power transmission, and also is an important lifeline engineering structure. Compared with the general civil engineering structure, it has the common characteristics of the tower shaped structure and the long span structure, such as high structure, large span, flexible and so on. The most significant feature is that it is all connected by conductors composed to continuous continuum,and sensitive to wind load, ice disaster, easy to occur destruction and collapse phenomenon under hazard loads.Composites is emerging materials, applied to the instance on the transmission tower is less, the domestic research is still in initial stage.Therefore, the composite transmission tower for dynamic response research is of great significance.This paper summarizes the current apply situation of composite transmission tower and research on dynamic response of transmission tower-line system. Taking a composite transmission tower as the research object, the three-dimensional finite element was be analyzed.According to the catenary equation, the expression of the space curve of the transmission tower is obtained. Build the reasonable simulation of the wire through command stream and correct unit selecting. Furthermore,the spatial finite element model of the three tower two line transmission system is established.Dynamic characteristics of single tower and tower line system is analyzed to study the influence of the conductor on the vibration period of the tower. According to the structural characteristics of transmission tower and tower line system in wind field, chose the Kaimal wind speed spectrum which changes along the height, adopted the harmonic superposition method to simulate the wind speed time history of transmission tower, and then compared the simulated pulsating wind speed power spectrum with the target power spectrum, which shows that the simulated wind speed is accurate and reliable. Then use Newmark-β method to calculate and analyses the wind vibration response of transmission line system, compared to the response of single tower. Some important conclusions have been drawn, ’which are useful to engineering practice.In this paper, the ice shedding vibration of the composite tower is analyzed to study the influence of different ice mass and different damping on the transmission tower system,including the displacement and stress of the conductor, the displacement, stress, shear and bending moment of side tower and middle tower, so as to analyze the vibration characteristics of the tower line after ice shedding. It provides a theoretical basis for the design of composite transmission line system.