科研之友
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摘要
This study calculates the dynamic responses of a three-degree of freedom elastic system with the program to ground vertical excitations induced by blasting. The excitations include measured blasting vibration waves and ideal sine waves. The results show that the blasting vibration waveforms and spectrum characteristics have evident effects on structural dynamic responses because blasting vibration waves are complex signals containing many frequency contents. By decomposition and reconstruction of wavelet packet, the measured blasting vibration velocity signals are transformed into superposition of several simple harmonic waves. Then the structural dynamic response under blasting vibration can be taken as structural dynamic mechanics for structure under a series of simple harmonic loads. A new safety criterion of structure to blasting vibration is put forward by introducing a new concept of velocity factor and normalized energy proportional to structural dynamic calculation. The criterion can reflect the influence of velocity value of structural response under blasting vibration excitation to structural characteristic parameters, as well as particle peak velocity, frequency, duration and energy proportion of blasting vibration signal on structural safety.
