The paper reports a new pile-force gauge based upon the principle of the vibrating wire. The gauge is intended to be driven down with a precast concrete pile and can be placed at an arbitrarily chosen depth in the pile. The impacts from the pile driving will not impair the gauge. The gauge registers the static loads and bending moments in a pile with an error not exceeding 2% of the linear measuring range. This maximum error includes the drifting of zero point and change of sensitivity with time.The design of the gauge and laboratory and full-scale tests are reported, and suitable use of the gauge is suggested.
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Fellenius et al. (1969) studied this question.