ABSTRACT

This paper shows the experimental results of impact hammer tests conducted on sand and composite sand-polyurethane samples at different confining pressures. It was found that polyurethane can mitigate the propagation of waves generated by an impact, thereby influencing seismic isolation. Also, accelerations in the composite samples were reduced in relation to the percentage of polyurethane present. A theoretical lumped-mass model (calibrated based on the experimental results) interpreted the experimental results and enabled an in-depth parametric analysis. This analysis shows that the proposed isolation method is efficient, as the damping coefficient of the polyurethane and the soil/polyurethane impedance ratio increased.

摘要

本文展示了在不同围压下对砂和复合砂-聚氨酯样品进行冲击锤试验的实验结果。发现聚氨酯可以减轻冲击产生的波的传播，从而影响隔震。此外，复合材料样品中的加速度相对于聚氨酯的存在百分比有所降低。理论集中质量模型（根据实验结果校准）解释了实验结果并启用了深入的参数分析。该分析表明，所提出的隔离方法是有效的，因为聚氨酯的阻尼系数和土壤/聚氨酯阻抗比增加。