Abstract:The response spectrum that is largely applied in earthquake engineering is employed to study the blast seismic effect. Based on the response spectrum theory of system with single degree of freedom,the response spectrum is calculated by using analytical expression of trigonometric interpolation with great efficiency and high precision instead of piecewise linear interpolation. Response spectrum analysis of blast vibration signals in single and multi-deck blasting is performed with a vast amount of monitoring data from engineering blast. The results show that response characteristics of vibration induced by single deck and multi-deck blasting have marked differences. Multi-deck blasting not only has the good effects of reducing vibration by wave interference,but also increases the probability of selective magnification in the structural response on blasting-induced vibration. The effect of selective magnification varies with the types of structure. It is shown that the method provides an effective tool for studying blast seismic effect,especially constituting velocity-frequency safety criteria.