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Seismic loads on the foundations of hydraulic structures during strong earthquakes

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Hydrotechnical Construction Aims and scope

Conclusions

  1. 1.

    Records of earthquakes with an intensity of 3–5 recorded at the same observation point on a rock foundation near the Chirkey dam were examined. The data of the horizontal and vertical components of the seismic oscillations were analyzed. The seismometric data were processed by two methods — manually and according to the “Spectrum” program on a BÉSM-4 computer.

  2. 2.

    For the accelerograms practically coinciding values of the maximum intensities of the seismic oscillations Amax with a period Tmax=0.18 sec were obtained for the horizontal and vertical components. For the velocigrams Amax=2.6 cm/sec with Tmax= 0.07 sec for the horizontal component and Amax= 3. A cm/sec with Tmax=0.07 sec for the vertical component.

  3. 3.

    The spectra obtained with computer processing of the accelograms indicate that the maximum intensities of oscillations for the horizontal and vertical components lie in the same interval of frequencies 2<=υ<=9 Hz, but for the horizontal component the maximum at frequency 0.2 Hz is absent and the entire spectrum is somewhat shifted into the high-frequency region.

A. The machine spectra of the velocigrams for the horizontal component show maximum values in the interval 2<=υ<=6 Hz and for the vertical in the interval 2<=υ<=8 Hz.

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Literature cited

  1. S. V. Medvedev and A. P. Sinitsyn, “Problems of seismics at the Eighth Congress of the Commission on Large Dams,” Gidrotekh. Stroit., No. 4 (1965).

  2. N. N. Nikolaev, “Reservoirs and earthquakes,” Fizika. Zemlya, No. 10 (1971).

  3. L. A. Skorik, “Methods of obtaining certain spectral characteristics of soils for problems of seismic stability of structures,” Akad. Nauk Arm. SSR, Erevan, No. 10 (1979).

  4. J. Tukey, Use of Phase Equation Methods and Impulse Formation for Determining the Original Perturbation of Rayleigh Waves [Russian translation], Moscow-Leningrad (1962).

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Authors
  1. L. A. Skorik
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 1, pp. 22–25, January, 1988.

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Skorik, L.A. Seismic loads on the foundations of hydraulic structures during strong earthquakes. Hydrotechnical Construction 22, 23–27 (1988). https://doi.org/10.1007/BF01424213

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  • DOI: https://doi.org/10.1007/BF01424213

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