![]() This could be a significant change depending on your region.Īlso, new site specific ground motion requirements have been included in Chapter 11.4.8. Now, the default site class is a blend of Site Class C and D. Since the Fa factors have changed, Site Class D is no longer the default site class. These factors range from 80%-120% of the previous Fa and Fv factors depending on location. ![]() Since the the last update in 1994, thousands of new seismic data points were added which have resulted in new, more accurate site amplification factors. Changes were made throughout the provisions, however the updates within Chapter 11 may affect the most engineers nationwide. John covered the technical changes to the seismic provisions and explained the basis for these changes. In December 2018, John Hooper, PE, SE, from Magnusson Klemencic Associates, gave a presentation on Updates to the Seismic Provisions in ASCE 7-16. Have you reviewed the newest changes to the seismic provisions in ASCE 7-16? Even for engineers who do not typically practice in high seismic areas, the changes may affect your site class, geotechnical requirements, and analysis procedure.
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June 2023
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