Abstract
A parametric study of nonlinear seismic response analysis of transmission line structures subjected to earthquake loading is studied in this paper. The transmission lines are modeled by cable element which accounts for the nonlinearity of the cable based on a real project. Nonuniform ground motions are generated using a stochastic approach based on random vibration analysis. The effects of multicomponent ground motions, correlations among multicomponent ground motions, wave travel, coherency loss, and local site on the responses of the cables are investigated using nonlinear time history analysis method, respectively. The results show the multicomponent seismic excitations should be considered, but the correlations among multicomponent ground motions could be neglected. The wave passage effect has a significant influence on the responses of the cables. The change of the degree of coherency loss has little influence on the response of the cables, but the responses of the cables are affected significantly by the effect of coherency loss. The responses of the cables change little with the degree of the difference of site condition changing. The effect of multicomponent ground motions, wave passage, coherency loss, and local site should be considered for the seismic design of the transmission line structures.
Highlights
Transmission line structures are very important to electric engineering
The past earthquakes indicate that transmission lines are often damaged under earthquake loading
There are no calculation methods about how to consider the transmission line structures under earthquake loading in current seismic codes [4, 5]
Summary
Transmission line structures are very important to electric engineering. Most of the transmission lines cross the highly seismic region. There are no calculation methods about how to consider the transmission line structures under earthquake loading in current seismic codes [4, 5]. The results showed that the effect of ground motion spatial variations should be incorporated in seismic analysis of the transmission tower-line system. The results showed that the effect of nonuniform ground motions should be considered in seismic design for the straight line type and broken line type transmission lines practical engineering. A lot of studies about the response of transmission towers are obtained, but there is little research about the parametric study of nonlinear response of transmission line structures under earthquake loading. The parametric studies of seismic response analysis of transmission line structures considering geometric nonlinearity subjected to earthquake loading are carried out in this paper. The analysis results could provide reference for the seismic design of the transmission line structures
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