Abstract
A realistic prediction of the fatigue life of concrete under high-cycle loading scenarios with variable amplitudes is of utmost importance for a reliable and economically efficient design of structural infrastructures for transportation and energy supply. Current design codes estimate fatigue life under variable amplitudes using the Palmgren-Miner rule, which assumes a linear scaling between the lives measured for uniform cyclic loading scenarios. However, several series of experiments conducted in the past showed that this assumption is not valid and may lead to unsafe design. The paper shows recent results of experimental campaign focused on the compressive fatigue behavior of concrete in response to a subcritical cyclic loading with variable amplitudes. The obtained results present evidence of the effect of loading sequence on the fatigue life of concrete. To substantiate the experimental results, an interpretation of the phenomenology behind the sequence effect is provided in terms of the dissipated energy due to damage within the material structure.
Published Version
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