THE ASEISMIC DESIGN OF CONCRETE DAMS-II

The form of dynamic loading when designing dams for construction in earthquake zones is discussed, resovior- induced seismicity is examined, and tests on prototype arch dams are described. The mathematical basis of dynamic analysis is also discussed. Precomputing response spectra is one approach which gives reasonably useful results in dam designing. Evaluationof such methods for aseismic design of buildings has shown the importance of the extension of design spectrum concepts into the inelastic range. An alternative method is discussed which involves the direct integration of equations of motion. Seismic activity due to impoundement is descussed, four possible explanations are set forth, and evidence of seismicity induced by reservoirs in China is detailed. Chinese data was collected from 13 accelerograph stations disposed about the dam, with a concentration of 4 each on two buttresses (arranged regularly from base to crest), four along the crest, and (most important) one on exposed bedrock some distance from the dam itself. Studies of the dynamic effect of the reservoir are described and it is shown that the actual distribution of added mass is quite different from that which would be predicted by Westergaard. It is pointed out that there is no need to make an electrical analogue for the added mass; it is simply a computer routine to be run before the main analysis. Tests on various prototype arch dams are outlined, and two types (model which coincides as closely as possible with the prototype as the lows of similitude allow; and a physical model made to check the accuracy and/or validity of a computational model which may be used on the prototype) of models used for the tests are described.

  • Corporate Authors:

    IPC Electrical Electronic Press Limited

    Dorset House Stamford Street
    London SE1 9LU,   England 
  • Authors:
    • SEVERN, R T
  • Publication Date: 1976-2

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Filing Info

  • Accession Number: 00132909
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 5 1976 12:00AM