Abstract
Earlier anomolous results obtained in measuring the dynamic shear modulus of specimens of concrete by a torsional resonance technique are now explained satisfactorily. A theory, given by Davies in 1938, predicts discrepancies in the apparent shear modulus obtained at higher harmonic resonances due to warping of the rectangular section during vibration. The experimental results are in extremely good agreement with Davies's theory, and it is found that the corrected shear modulus is not significantly influenced by the frequency at which it is measured. This conclusion agrees with the results obtained from torsional resonances on a concrete beam of circular cross-section for which no correction is required.
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