Site-Specific Response Spectra for Memphis Sheahan Pumping Station
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Analytical methods for site response analysis incorporating nonlinear soil behavior are increasingly being used for engineering applications to evaluate the characteristics of earthquake ground motions. Several studies have shown that the amplitude and frequency content of bedrock motions, bedrock depth, shear modulus of soils, soil types, and soil strata could affect the results of site response analysis tremendously. In this study, using the site of Sheahan pumping station, Memphis, Tennessee, an approach to include uncertainties in seismic and site parameters in evaluating site-specific response spectrum is suggested. The mean normalized site-specific response spectrum specified in the 1988 Uniform Building Code and the 1988 NEHRP Recommended Provisions. It is observed that the spectral accelerations between the periods of 0.4 and 1.0 seconds are much higher than those specified in the model building codes. A similar conclusion is also reached from the comparison with the inelastic response spectrum specified in the 1988 Standard Building Code. Thus, for a site with deep soil profile such as the case of Sheahan pumping station, the design response spectrum needs careful evaluation to ensure satisfactory performance of structures during an earthquake.