Experimental investigations on the quasi-static axial crushing of foam-filled double square columns
泡沫铝夹芯双方管结构准静态轴压性能的实验研究

Experimental studies on the quasi-static axial crushing of foam-filled double square columns were carried out. It was revealed that the load carrying capacity and the energy absorption efficiency of the foam-filled double tube structure are higher than those of the corresponding empty and foam-filled single square columns. For the foam-filled double tube structure, the stroke efficiency and the energy absorption efficiency under the outer tube tear failure mode is higher than that under the progressive buckling mode. And a new filling method, i.e. foam filled in corners of the double square column, is tested and it is found that its deformation mode is much stable and the energy absorption efficiency is higher. The effect of the inner tube thickness and material on the response was also investigated. It shows that, thickening the inner tube will increase the energy absorption ability. But enhancing the inner tube material affects the structural response little.