A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Site Factors and Site Categories in Seismic Codes
The report discusses some of the evidence on amplification of earthquake motions due to local soils which culminated in the new definitions of site categories and site coefficients, F(sub a) and F(sub v), incorporated, first in the 1994 NEHRP Recommended Provisions for Seismic Regulations for New Buildings, and more recently in the 1997 NEHRP and 1997 Uniform Building Code (UBC). These site categories and site coefficients are described and compared to previous code provisions. Preliminary results of recent studies are discussed including averages and ranges of site coefficients calculated from recordings of the 1994 Northridge earthquake, which generally validate the 1994 NEHRP values. The possibility of performing similar calculations of site coefficients from available recordings of the 1995 Kobe, Japan earthquake is also discussed. Use of the low period site coefficient, F(sub a) in conjunction with de-aggregated measures of the seismic hazard on rock are suggested for evaluation of soil liquefaction in seismic codes. Areas needing further research are suggested. Finally, it is recommended that the seismic design provisions contained in the 1996 AASHTO Standard Specifications for Highway Bridges be updated to be consistent with the 1994 and 1997 NEHRP and 1997 UBC provisions for site categories and site coefficients.
Site Factors and Site Categories in Seismic Codes
The report discusses some of the evidence on amplification of earthquake motions due to local soils which culminated in the new definitions of site categories and site coefficients, F(sub a) and F(sub v), incorporated, first in the 1994 NEHRP Recommended Provisions for Seismic Regulations for New Buildings, and more recently in the 1997 NEHRP and 1997 Uniform Building Code (UBC). These site categories and site coefficients are described and compared to previous code provisions. Preliminary results of recent studies are discussed including averages and ranges of site coefficients calculated from recordings of the 1994 Northridge earthquake, which generally validate the 1994 NEHRP values. The possibility of performing similar calculations of site coefficients from available recordings of the 1995 Kobe, Japan earthquake is also discussed. Use of the low period site coefficient, F(sub a) in conjunction with de-aggregated measures of the seismic hazard on rock are suggested for evaluation of soil liquefaction in seismic codes. Areas needing further research are suggested. Finally, it is recommended that the seismic design provisions contained in the 1996 AASHTO Standard Specifications for Highway Bridges be updated to be consistent with the 1994 and 1997 NEHRP and 1997 UBC provisions for site categories and site coefficients.
Site Factors and Site Categories in Seismic Codes
R. Dobry (author) / R. Ramos (author) / M. S. Power (author)
1999
122 pages
Report
No indication
English
Geology & Geophysics , Highway Engineering , Soil & Rock Mechanics , Structural Analyses , Earthquake engineering , Seismic design , Building codes , Soil-structure interactions , Ground motion , Seismic waves , Earthquake damage , Liquefaction , Amplification , Hazards , Soil mechanics , Coefficients , Seismic effects , California , Japan , Northridge Earthquake , Kobe Earthquake
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