Abstract

Diurnal fluctuations of natural frequencies are investigated from two-year ambient vibration test and model experiments with thermal loading, where a steel reinforced concrete building was seismically retrofitted on intermediate floors. The amplitudes of the diurnal fluctuations of the natural frequencies approach to 0.1Hz, which is of the same as the increasing due to the retrofitting works and that due to structural damage to be expected. The natural frequency fluctuations are strongly correlated with temperature differentials between the inside and the outside of outer columns or earthquake resisting-walls, that is also demonstrated by a concrete column test with thermal loading.

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