Amplification effect of plateau ground motion under complex regional terrain conditions

ZHAO Shixing1, LUO Qirui1, XIONG Feng2, WU Qihong3, XIA Jing1, YANG Shuheng1, ZHANG Min4

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (23) : 230-239.

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PDF(5547 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (23) : 230-239.

Amplification effect of plateau ground motion under complex regional terrain conditions

  • ZHAO Shixing1, LUO Qirui1, XIONG Feng2, WU Qihong3, XIA Jing1, YANG Shuheng1, ZHANG Min4
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Abstract

The relevant regulations for the amplification effect of ground motion on irregular terrain were all based on isolated terrain. However, mountainous topography often existed in the form of mountains, and adjacent topography would affect the earthquake wave propagation and change the law of ground motion. Therefore, it was of great significance to study the ground motion amplification factor of non-isolated terrain for the seismic design of mountain buildings and improving the accuracy of post-earthquake disaster assessment. In this paper, the typical topographic amplification effect occurred in the unfavorable section of Moxi platform during the Luding MS6.8 earthquake was described. Then, the influence of complex topography (ridge and canyon) on the amplification factor of ground motion of the platform was deeply explored by simulation. The spatial distribution of amplification factor, Fourier spectrum of acceleration and amplitude ratio were quantitatively studied, and the motion rules of complex topographic on platform surface were obtained through a large number of analyses. The results showed that the regulations in “Seismic Code” underestimated the topographic effect of the platform in some cases, and the suggestive value of the amplification factor was difficult to ensure the safety of the structure. Thus, it needed to be adjusted and refined. In addition, the adjacent ridges and canyons had obvious effects on the platform surface and should not be ignored. Therefore, it was suggested that the relevant specifications should increase the adjustment coefficient to consider the interaction between adjacent landforms.

Key words

topographic amplification factor / complex mountainous topography / platform topography / disaster investigation / numerical analysis

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ZHAO Shixing1, LUO Qirui1, XIONG Feng2, WU Qihong3, XIA Jing1, YANG Shuheng1, ZHANG Min4. Amplification effect of plateau ground motion under complex regional terrain conditions[J]. Journal of Vibration and Shock, 2024, 43(23): 230-239

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