IS 4967 -1968 Code Book PDF free download
This Indian Standard was adopted by the Indian Standards Institution on 17 November 1968, after the draft finalized by the Earthquake Engineering Sectional Committee had been approved by the Civil , Engineering Division Council. Evaluation of seismic status of faults and thrusts and collection and maintenance of seismological data both in reconstruction as well as post construction stages of a river valley project are of vital importance because of safety reasons. In addition to permanent installation of instruments within the dam and appurtenant structures and in the surrounding areas, the study of micro tremors and predominant period with temporary instruments as given in detail under 3 will be supplementary and may be regarded as a part of the site investigations for selecting the best suitable type of foundation. The recommendations given in this standard may, however, also be used for investigation of seismic of site for any project besides river valley projects, if the situation and the magnitude of the project justifies so. For the purpose of deciding whether a particular requirement of this standard is complied with, the formal value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
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