| Abstract: | Three proposals are provided to update tables 11.4-1 and 11.4-2 of Minimum Design Loads for Buildings and Other Structures (7-10), by the American Society of Civil Engineers (2010) (ASCE/SEI 7-10), with site coefficients implied directly by NGA (Next Generation Attenuation) ground motion prediction equations (GMPEs). Proposals include a recommendation to use straight-line interpolation to infer site coefficients at intermediate values of ̅vs (average shear velocity). Site coefficients are recommended to ensure consistency with ASCE/SEI 7-10 MCER (Maximum Considered Earthquake) seismic-design maps and simplified site-specific design spectra procedures requiring site classes with associated tabulated site coefficients and a reference site class with unity site coefficients. Recommended site coefficients are confirmed by independent observations of average site amplification coefficients inferred with respect to an average ground condition consistent with that used for the MCER maps. The NGA coefficients recommended for consideration are implied directly by the NGA GMPEs and do not require introduction of additional models. |
| Genre: | USGS Numbered Series |
| ProdID: | 70042548 |
| Citation Author: | Borcherdt, Roger D. |
| Citation Contributing Office: | Earthquake Science Center |
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| Citation Language: | English |
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| Citation Number Of Pages: | 29 |
| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iv, 25 p. |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2012-1269 |
| Citation Search Results Text: | Implications of NGA for NEHRP site coefficients; 2012; OFR; 2012-1269; Borcherdt, Roger D. |
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| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Implications of NGA for NEHRP site coefficients; 2012; OFR; 2012-1269; Borcherdt, Roger D. |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2012/1269/ |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/ofr_2012_1269.gif |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/2012/1269/of2012-1269.pdf |
| Date Other: | Fri, 11 Jan 2013 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
