The results of pseudodynamic (PD) tests, those concerning stiff specimens especially, may be seriously impaired by systematic errors. The paper deals with the error analysis of PD seismic tests on relatively stiff half-size-scale infilled frames, modelled as single-degree-of-freedom systems. Several performance indices are reported and applied to a first group of experiments. The nature and degree of the error inherent in the laboratory system is deduced. A simple correction for that error is statistically identified and used in the subsequent tests. The improvement is assessed by applying the aforementioned indices again. It is shown that one can mitigate the error by taking account of the stiffness deterioration of the specimens.
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