Abstract
Nonlinear seismic behaviors of different boundary conditions of transmission line system under earthquake loading are investigated in this paper. The transmission lines are modeled by cable element accounting for the nonlinearity of the cable. For the suspension type, three towers and two span lines with spring model (Model 1) and three towers and four span lines’ model (Model 2) are established, respectively. For the tension type, three towers and two span lines’ model (Model 3) and three towers and four span lines’ model (Model 4) are created, respectively. The frequencies of the transmission towers and transmission lines of the suspension type and tension type are calculated, respectively. The responses of the suspension type and tension type are investigated using nonlinear time history analysis method, respectively. The results show that the responses of the transmission tower and transmission line of the two models of the suspension type are slightly different. However, the responses of transmission tower and transmission line of the two models of the tension type are significantly different. Therefore, in order to obtain accurate results, a reasonable model should be considered. The results could provide a reference for the seismic analysis of the transmission tower-line system.
Highlights
Transmission line is an important facility and a continuous structure which is made up of transmission towers and transmission lines [1]
The analyses of the suspension type and tension type shown in Figures 2 and 3 under multicomponent and multisupport seismic excitations are calculated using nonlinear time history analysis method, respectively
Nonlinear seismic behaviors of different boundary conditions of transmission line systems under nonuniform seismic excitations are studied in this paper
Summary
Transmission line is an important facility and a continuous structure which is made up of transmission towers and transmission lines [1]. Researchers have done some analysis on the response of transmission tower-line system under seismic excitation in the past decades. The results showed that the effect of ground motion spatial variations should be incorporated in seismic analysis of the transmission tower-line system. Wang et al [17] researched the progressive collapse analysis of a transmission tower-line system under earthquake. Tian et al [19] analyzed the effects of boundary conditions, ground motion spatial variations, the incident angle of the seismic wave, coherency loss, and wave travel on the responses of the tension type of the transmission tower-line system, respectively. The responses of the suspension type and tension type of the transmission tower-line system under multicomponent and multisupport seismic excitations are performed using nonlinear time history analysis method, respectively. The results could provide a reference for seismic analysis of the transmission tower-line system
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