Seismic response of ground powerhouse of hydropower station based on different free field construction methods with oblique incidence of SV wave

WANG Fei1, SONG Zhiqiang1, LIU Yunhe1, ZHANG Jianfeng2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (7) : 9-18.

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PDF(2236 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (7) : 9-18.

Seismic response of ground powerhouse of hydropower station based on different free field construction methods with oblique incidence of SV wave

  • WANG Fei1, SONG Zhiqiang1, LIU Yunhe1, ZHANG Jianfeng2
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Abstract

Aiming at problems of oblique incidence being seldom considered in near-fault ground motion input and existing different free-field construction methods, the accuracy of different free-field construction methods and their influences on seismic response of ground hydropower house were studied. Firstly, the total wave field was decomposed into ingoing and outgoing fields. 3 kinds of free fields on each foundation border surface were analyzed based on the principle of wave field superposition. The equivalent nodal load formula corresponding to each border surface free field was derived, and the oblique incidence input of plane SV wave was realized combining with boundary conditions.Free-field of the whole foundation under 3 oblique incidences and its calculation accuracy relative to the analytical solution were analyzed. It was shown that when outgoing fields of bottom and right border of foundation are not considered, the calculation error is large;when they are considered, the calculation error is very small, and the maximum error is only -3.8%.Secondly, effects of pulse type and non-pulse ground motions on seismic response of the hydropower house under 3 kinds of free field construction methods were studied. The results showed that the total input energy and damage energy dissipation of the powerhouse have larger increase without considering outgoing fields of bottom and right border of foundation to cause extensive damage of draft tube structure at lower part of the power house and obvious change of the proportion of various energy in the total input energy;under the same free field construction method, the damage ability of pulse type ground motion to the powerhouse is stronger, so attention should be paid to the aseismic design of the powerhouse near the fault area.

Key words

ground hydropower house / seismic wave oblique incidence / free-field / pulse type ground motion / energy

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WANG Fei1, SONG Zhiqiang1, LIU Yunhe1, ZHANG Jianfeng2. Seismic response of ground powerhouse of hydropower station based on different free field construction methods with oblique incidence of SV wave[J]. Journal of Vibration and Shock, 2021, 40(7): 9-18

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