عنوان مقاله [English]
This paper investigates the static response of thin-walled semi-spherical steel under axial loading. The influence of geometrical and loading parameters on the static response is investigated experimentally and numerically. Results are quantified in terms of mean collapse load. Mean collapse load is calculated by dividing the area under the load-displacement curve into displacement of the upper rigid plate.In this paper, the effect of shell diameter, thickness, cutout and shell height was investigated and it has been concluded that, by increasing cutout size, the mean collapse load decreases. Also, the load-deformation curves do not change by decreasing the height of semi-spherical shells. Also, in this paper, the effects of loading parameters are studied. Shells are loaded by rigid plate , rigid bar, rigid tube and rigid plate with a hole, and it is resulted that the shell can tolerate a greater mean collapse load when loaded by a rigid plate in comparison with a rigid bar.The primary outcome of this study is new design information on the energy absorption performance of thin-walled semi-spherical steel, which will facilitate the development of the design guidance of such shells as energy absorbers under various loading. The numerical analysis was carried out using ABAQUS software and the experimental tests were performed using an Instron 8802 servo-hydraulic machine. The numerical and experimental results are very close together and, therefore, the numerical results are valid.