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Seismic responses of straight line type and broken line type transmission tower-line systems subjected to non-uniform seismic excitations are studied in this paper. Three-dimensional finite element models of the straight line type and broken line type transmission tower-line coupled systems are established, respectively. Based on power spectral density function, coherency loss function and code for design of seismic of electrical installations, spatial variation of seismic ground motions are synthesized. Using nonlinear time history analysis method, the influence of wave passage effect, coherency loss effect and different local site effect on the seismic response of two type transmission tower-line systems are investigated, respectively. The results show that the assumption of uniform ground motion could not provide accurate responses of the two type transmission tower-line systems. Non-uniform seismic excitations increase the axial force of transmission tower, and the vertical displacement and tension force of transmission lines. Neglecting these effects will underestimate the response of the two type transmission tower-line systems. The effect of non-uniform ground motions should be considered in seismic design for the straight line type and broken line type transmission lines practical engineering.

SEISMIC RESPONSE OF STRAIGHT LINE TYPE AND BROKEN LINE TYPE TRANSMISSION LINES SUBJECTED TO NON-UNIFORM SEISMIC EXCITATIONS