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Abstract ▼ AI-Helper

Current concrete structures are quite often exposed to terroristic threats. Therefore, estimating concrete mechanical properties under dynamic loading conditions starts to become important. Due to the high rates of loading and highly dynamic behavior of the specimens, it is hard to be applied the sa...

Current concrete structures are quite often exposed to terroristic threats. Therefore, estimating concrete mechanical properties under dynamic loading conditions starts to become important. Due to the high rates of loading and highly dynamic behavior of the specimens, it is hard to be applied the same sampling rates used in common static loading tests to dynamic tests. The objective of this study is to estimate effects of concrete types and applying different impact loads on recommended sampling rates for measuring reaction force and acceleration. The recommended sampling rates in this study were determined according to the Nyquist's sampling theorem. The Nyquist's theorem states that the sampling rate should be at least twice the maximum response frequency(Nyquist frequency) for avoiding aliasing. The results of this study showed the following things: I) the recommended sampling rates for reaction force and acceleration were not influenced by types of concrete and levels of applied impact energy, but the sampling rates was affected by type of measuring data, ii) the recommended sampling rate for acceleration was faster than that for reaction force, so the sampling rate for entire impact test system should be determined based on the sampling rate for acceleration, iii) there was not any relationship between the frequency at the maximum value in power spectrum and the recommended sampling rate.

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