纵向地震下1000kV出线构架的输电导线耦合作用振动台试验研究

To figure out the influence mechanism of the dynamic coupling effect of transmission lines on seismic responses of the 1000 kV outgoing line frame under longitudinal excitations and discuss the influence of sag-span ratios of transmission lines, shaking table tests were performed on a single-span 1000 kV outgoing line frame by considering the dynamic coupling effect of transmission lines with a scale factor of 1:15.Moreover, transmission lines were simulated by the massless springs with equivalent dynamic stiffness. Test results indicate that the seismic responses of 1000 kV frame are reduced by the strong dynamic coupling effect of transmission lines; with the decrease in sag-span ratio, the energy dissipated by the suspended system increases and the elastic constraints of transmission lines on the frame enhance, resulting in further reducing the seismic responses of 1000 kV frame. Furthermore, the results of numerical reconstruction analysis of the experiments indicate that the finite element analysis can simulate the dynamic coupling effect between transmission lines and 1000 kV frame very well.