ABSTRACT

A new experimental apparatus for performing impact tests is presented, to analyse the wave propagation phenomenon in pure sand and in composite sand-polyurethane specimens, with the final aim to explore the seismic mitigation given by a polyurethane inserted into a real soil under existing structures. Polyurethane layers at three different thicknesses are considered. Experimental results show that composite specimens provide acceleration reductions increasing with the increase of polyurethane thickness. Result interpretation in the light of the elastic wave propagation theory is presented, pointing out the experimental set-up limitations, mainly due to the lack of sufficient specimen confinement.

摘要

提出了一种用于进行冲击试验的新实验装置，用于分析纯沙和复合沙子-聚氨酯试样中的波传播现象，最终目的是探索在现有结构下将聚氨酯插入真实土壤中的地震缓解作用。考虑了三种不同厚度的聚氨酯层。实验结果表明，复合试样提供的加速度降低随着聚氨酯厚度的增加而增加。提出了根据弹性波传播理论的结果解释，指出了实验设置的局限性，主要是由于缺乏足够的试样限制。