Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

This case study involves analysis of seismic records observation at two adjacent buildings, similarly constructed except that one is fitted with the base isolation system, to investigate the nature of soil-structure interaction mechanism involved. Altogether 19 earthquake records with maximum acceleration of over 10 cm/s2 are selected for the analyses. The south face of the building site slopes downward at an angle of about 20 degrees, which may contribute to topographical effect in wave propagation through the ground. Effects of the surface irregularity to the observed records are also discussed based on the interrelation between peak values of acceleration, velocity, spectral ordinate at 5% damping and Fourier spectral amplitudes. Inertial and kinematic interaction effects are also discussed based on the ratio of spectral amplitudes. Correlation analysis is subsequently carried out by obtaining coherency function and phase spectra. Results from coherency, phase lag, acceleration time history in limited frequency bands, and trends in particle motion orbits indicate that the free field motion at filled ground close to the sloping ground is out of phase building foundation (1F) motion at lower frequencies.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Dynamic Soil-Structure Interaction in Low-Rise Buildings from Seismic Records

New York, New York

This case study involves analysis of seismic records observation at two adjacent buildings, similarly constructed except that one is fitted with the base isolation system, to investigate the nature of soil-structure interaction mechanism involved. Altogether 19 earthquake records with maximum acceleration of over 10 cm/s2 are selected for the analyses. The south face of the building site slopes downward at an angle of about 20 degrees, which may contribute to topographical effect in wave propagation through the ground. Effects of the surface irregularity to the observed records are also discussed based on the interrelation between peak values of acceleration, velocity, spectral ordinate at 5% damping and Fourier spectral amplitudes. Inertial and kinematic interaction effects are also discussed based on the ratio of spectral amplitudes. Correlation analysis is subsequently carried out by obtaining coherency function and phase spectra. Results from coherency, phase lag, acceleration time history in limited frequency bands, and trends in particle motion orbits indicate that the free field motion at filled ground close to the sloping ground is out of phase building foundation (1F) motion at lower frequencies.