Riverview Development: Site-Specific Seismic Classification and Dynamic Analysis, North Bergen, New Jersey

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Overview: The cost of multi-story buildings can be greatly influenced by potential earthquake loads. Under International Building Code (IBC) guidelines, the presence of as little as 10 ft of soft soil results in ‘E’ or ‘F’ classes even though more favorable soils may prevail in the upper 100 ft. While classes ‘A’ through ‘E’ do not specifically require a seismic analysis, the determination of a site-specific response spectrum at the ground surface may justify upgrading to a better class, thus reducing foundation size and optimizing structural design. GeoStructures conducted site-specific seismic classification and dynamic analysis for high-rise condominiums to be built in North Bergen, New Jersey.

GeoStructures applied test borings, geophysical surveys, seismic cone soundings, resonant column testing, and dynamic seismic analysis using the finite element method (FEM) and Quake/W to determine the site class. Our work enabled an upgrade in the site class from ‘E’ to ‘D’, resulting in significant savings in the building costs through optimization of the framing.

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