轴向冲击荷载下L形截面钢管混凝土短柱受力性能

为研究L形截面钢管混凝土短柱在受到轴向冲击荷载作用下的受力性能,通过落锤冲击试验,获得在不同冲击高度下的冲击应力时程曲线,并建立有限元模型,分析钢材、混凝土强度和冲击不同位置对短柱力学性能的影响。结果表明:随着冲击高度的增加,落锤冲击应力峰值增大;钢材壁厚大的试件,其冲击应力峰值较大,变形较小;选择强度较大的钢材能显著提高试件的抗冲击承载力,而混凝土强度等级的影响则相对较小,在不同的冲击位置下显示协同性较好。

Research on Mechanical Behaviors of L-shaped Concrete-filled Steel Tubular Short Column under Axial Impact Load

In order to study the mechanical behavior of L-shaped concrete-filled steel tubular short columns subjected to axial impact loads, the impact stress time-history curves at different impact heights were obtained by the drop weight impact test. The finite element model was established and the steel was analyzed. The influence of different positions of concrete strength and impact on the mechanical properties of short columns. The results show that with the increase of impact height, the peak value of drop hammer stress increases. The specimen with large wall thickness has larger impact stress and less deformation. Selecting steel with higher strength can significantly improve the resistance of the specimen. Impact bearing capacity, while the impact of concrete strength grade is relatively small, showing good synergy at different impact locations.