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985d112f2e . Seismic Zones are a vestige of the Uniform Building Code or UBC and were introduced in the 1949 edition when the USA seismic hazard map, published in 1948 by the US Coast and Geodetic Survey was adopted into the UBCIt was intended to promote public safety and provided standardized requirements for safe construction which would not vary from city to city as had previously been the case.Updated editions of the code were published approximately every three years until 1997, which was the final version of the codeThe International Building Code (2000 and later editions) derives seismic design forces from two ground motion parameters (SS and S1), site class, and long-period transition period (TL)
Consulting and Structural Engineers Since 1919External linksThe maps evolved over time including the addition of a Seismic Zone 4 in 1976 and the division of Zone 2 into 2A and 2B in 1988More on this in the futureSeismic ZoneMay be you had experience with Zone 4 rated components or even today we get asked to design to Zone 3 or other seismic Zone requirements 2017 Nishkian Menninger Dean Monks Chamberlain :: Site Photo Credits :: Site by BCCM The convenience of simple Zone references has been replaced by plots of ground accelerations developed from complex algorithms developed by USGS that account for many important factors that affect the earthquake ground motions that could be expected to occur at a particular building siteUniform Building Code (UBC); however, was published in 1927 by the Pacific Coast Building Officials (PCBO), contained an optional seismic appendix, that used a coefficient C which ranged from 7.5% to 10% g (% of gravity applied as a lateral inertial load)