Site-Specific Seismic Ground Motion Analysis in the New York City Area—A Case Study
Publication: Lifelines 2022
ABSTRACT
This project is part of the planned reconfiguration of terminal at LaGuardia (LGA) Airport in Flushing, New York. Based on the results of subsurface exploration program, the stratigraphy of the site consists of fill underlain by organic silt/clay, underlain by sand, underlain by varved clay and silt, underlain by sand, glacial till, and bedrock. Initial liquefaction susceptibility evaluation using the New York City Building Code (NYCBC)-based liquefaction screening tool indicated that the Fill stratum may be susceptible to liquefaction. The site is assigned Seismic Site Class F, therefore in accordance with the NYCBC, it requires a site-specific response analysis to determine seismic parameters for the site. In order to develop design seismic soil profiles, Seismic Cone Penetration Tests (SCPT) were performed to collect shear wave velocity data. A site-specific ground motion analysis was conducted to develop a design acceleration response spectrum in accordance with the applicable provisions of ASCE 7 and NYCBC, using dynamic soil properties. Based on the results of the site-specific analysis, the liquefaction analysis was revised. Liquefaction risk and liquefaction-induced settlements were reduced significantly utilizing site-specific analysis results. The case study demonstrates in addition to Code compliance, performing site-specific seismic studies can obtain a better estimate of potential earthquake-induced shaking at a site, and it could potentially reduce dynamic loads, thus reduce design and construction costs significantly.
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Lifelines 2022
Pages: 126 - 134
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Published online: Nov 16, 2022
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