Observed and Predicted Response of Block Foundations


The amplitude frequency response on two concrete blocks measuring 1.5 m x 0.75 m x 0.7m high and 3m x 1.5mx 0.7m high was measured over a wide range of frequencies and exciting forces. the soil properties were determined by wave propagation tests, dynamic plate load test and oscillatory shear tests in the laboratory, and shear modulus versus shear strain plot was obtained for the site. the soil springs and damping were determined by the elastic half space analog solutions and compliance-impedance function approach. the details of the comparison of observed and predicted response of the two tests blocks indicate that in this particular case, using any of the two approaches, the natural frequencies of vibration could be predicted within 15 to 30 % of the observed values. the calculated amplitudes of vibration near the resonance did not show any specific trend of variation. the calculated vibration amplitudes away from the resonance showed a better agreement with the observed amplitudes.


Civil, Architectural and Environmental Engineering

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Article - Conference proceedings

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Publication Date

01 Dec 2005

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