Earthquakes and Structures

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Seismic responses of transmission tower-line system under coupled horizontal and tilt ground motion

  • Wei, Wenhui (Hubei Key Lab. of Road Bridge and Structure Engineering, Wuhan University of Technology) ;
  • Hu, Ying (Hubei Key Lab. of Road Bridge and Structure Engineering, Wuhan University of Technology) ;
  • Wang, Hao (Hubei Key Lab. of Road Bridge and Structure Engineering, Wuhan University of Technology) ;
  • Pi, YongLin (Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, UNSW Australia, UNSW Sydney)
  • Received : 2019.08.01
  • Accepted : 2019.11.12
  • Published : 2019.12.25
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Abstract

Tests and theoretical studies for seismic responses of a transmission tower-line system under coupled horizontal and tilt (CHT) ground motion were conducted. The method of obtaining the tilt component from seismic motion was based on comparisons from the Fourier spectrum of uncorrected seismic waves. The collected data were then applied in testing and theoretical analysis. Taking an actual transmission tower-line system as the prototype, shaking table tests of the scale model of a single transmission tower and towers-line systems under horizontal, tilt, and CHT ground motions were carried out. Dynamic equations under CHT ground motion were also derived. The additional P-∆ effect caused by tilt motion was considered as an equivalent horizontal lateral force, and it was added into the equations as the excitation. Test results were compared with the theoretical analysis and indicated some useful conclusions. First, the shaking table test results are consistent with the theoretical analysis from improved dynamic equations and proved its correctness. Second, the tilt component of ground motion has great influence on the seismic response of the transmission tower-line system, and the additional P-∆effect caused by the foundation tilt, not only increases the seismic response of the transmission tower-line system, but also leads to a remarkable asymmetric displacement effect. Third, for the tower-line system, transmission lines under ground motion weaken the horizontal displacement and acceleration responses of transmission towers. This weakening effect of transmission lines to the main structure, however, will be decreased with consideration of tilt component.

Keywords

Acknowledgement

Supported by : Natural Science Foundation, Central Universities

References

  1. Castellani, A. and Boffi, G. (1986), "Rotational components of the surface ground motion during an earthquake", Earthq. Eng. Struct. Dyn., 14, 751-767. https://doi.org/10.1002/eqe.4290140506.
  2. Castellani, A. and Boffi, G. (1986), "Rotational components of the surface ground motion during an earthquake", Earthq. Eng. Struct. Dyn., 14, 751-767. https://doi.org/10.1002/eqe.4290140506.
  3. Che, W. and Luo, Q. (2010), "Time-frequency response spectrum of rotational ground motion and its application", Earthq. Sci., 23, 71-77. https://doi.10.1007/s11589-009-0078-2.
  4. Gang, L., Qiang, X. and Wen, J. (2015), "Vibration energy absorption effects of conductors in transmission tower-wire coupling system subjected to earthquake", Earthq. Eng. Eng. Dyn., 35(5), 47-53. https://doi:10.13197/j.eeev.2015.05.47.lig.008.
  5. Gomberg, J. (1997). "Dynamic deformations and the M6.7, Northridge, California earthquake", Soil Dyn. Earthq. Eng., 16, 471-494. https://doi: 10.1016/S0267-7261(97)00011-0.
  6. Graizer, V. (2006), "Tilts in strong ground motion", Bull. Seismol. Soc. Am., 96(6), 2090-2102. https://doi.org/10.1785/0120060065.
  7. Hongnan, L., Suyan, W. and Qianxin, W. (1997), "Response of transmission tower system to horizontal and rocking earthquake excitations", Earthq. Eng. Eng. Vib., 17(4), 34-43.
  8. Huang, B.S. (1997), "Ground rotational motions of the 1999 Chi-Chi, Taiwan earthquake as inferred from dense array observations", Geophys. Res. Lett., 30(6), 40-1-40-4. https://doi:10.1029/2002gl015157.
  9. Laouami, N. and Labbe, P. (2006), "Experimental analysis of seismic torsional ground motion recorded by the LSST-Lotungarray", Earthq. Eng. Struct. Dyn., 31, 2141-2148. https://doi.10.1002/eqe.208.
  10. Lee, V.W. and Trifunac, D. (1985), "Torsional accelerograms", Soil Dyn. Earthq. Eng., 4(3) 132-139. https://doi.org/10.1016/0261-7277(85)90007-5
  11. Li, H. and Wang, Q. (1991), "Response analysis of the system consisting of long span transmission lines and their supporting towers to horizontal and rocking seismic motions", Eng. Mech., 8(4), 68-79.
  12. Li, H.N., Sun, L.Y. and Wang, S.Y. (2004), "Improved, approach for obtaining rotational components of seismic motion", Nucl. Eng. Des., 232, 131-137. https://doi.10.1016/j.nucengdes.2004.05.002.
  13. Li, T. and Hongnan, L. (2013), "Seismic response analysis of transmission tower-line system under multi component ground motion excitations", J. Civil Arch. Environ. Eng., 1, 86-95. https://doi.org/10.1260/1369-4332.14.3.457.
  14. Niazi, M. (1986), "Inferred displacements, velocities and rotations of a long rigid foundation located at EI Centro differential array site during the 1979 imperial valley, California, earthquake", Earthq. Eng. Struct. Dyn., 14, 531-542. https://doi.10.1002/eqe.4290140404.
  15. Nigbor, R.L. (1994), "Six-degree-of-freedom ground-motion measurement", Bull. Seismol. Soc. Am., 84(5), 1665-1669. https://doi:10.1016/0148-9062(95)93429-S.
  16. Peng, X.B. and Li, X.J. (2012), "Study of ground surface tilts from strong motion records of the Wenchuan earthquake", Acta Seismol. Sinica, 34(1), 64-75. https://doi:10.3969/j.issn.0253-3782.2012.01.006.
  17. Stedman, G.E., Li, Z. and Bilger, H.R. (1995), "Sideband analysis and seismic detection in a large ring laser", Appl. Opt., 34(24), 5375-5385. https://doi.org/10.1364/AO.34.005375.
  18. Sun, J., Zhang, J. and Cui, H. (2015), "Research on seismic stability analysis of long-span transmission tower-line system under multiple support excitations", World Earthq. Eng., 31(4), 58-65.
  19. Takeo, M. (1998), "Ground rotational motions recorded in near-source region of earthquakes", Geophys. Res. Lett., 25(6), 789-792. https://doi.org/10.1029/98GL00511.
  20. Takeo, M. and Ito, H.M. (1997), "What can be learned from rotational motions excited by earthquakes?", Geophys. J. Int., 129, 319-329. https://doi.org/10.1111/j.1365-246X.1997.tb01585.x.
  21. Tian, L., Ma, R., Pan, H., Qiu, C. and Li, W. (2017b), "Progressive collapse analysis of long-span transmission tower-line system under multi-component seismic excitations", Adv. Struct. Eng., 20(12), 1920-1932. https://doi:10.1177/1369433217700426.
  22. Tian, L., Pan, H., Ma, R. and Qiu, C. (2017a), "Collapse simulations of a long span transmission tower-line system subjected to near-fault ground motions", Earthq. Struct., 13(2), 211-220. https://doi.org/10.12989/eas.2017.13.2.211.
  23. Trifunac, M.D. (1982), "A note on rotational components of earthquake motions on ground surface for incident body waves", Soil Dyn. Earthq. Eng., 1(1), 11-19. https://doi.org/10.1016/0261-7277(82)90009-2.
  24. Trifunac, M.D. (2009), "Rotations in structural response", Bull. Seismol. Soc. Am., 99(2B), 968-979. https://doi.org/10.1785/0120080068.
  25. Wei, W., Xue, G., Zhang, D. and Yu, M. (2015), "Rotational components of ground motion based on wavelet analysis", Chin. J. Geotech. Eng., 37(7), 1241-1248. https://doi:10.11779/CJGE201507010.
  26. Zembaty, Z. (2009), "Tutorial on surface rotations from wave passage effects stochastic spectral approach", Bull. Seismol. Soc. Am., 99(2B), 1040-1049. https://doi.org/10.1785/0120080102.

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