钢管混凝土短柱轴压性能研究现状综述

A review of the research on the axial compressive properties of concrete filled steel tube(CFST)short columns

钢管混凝土是指在钢管中填充混凝土而形成且钢管及其核心混凝土能共同承受外荷载作用的一种组合结构。组合结构的抗震性能在很大程度上依赖于柱的强度和延性,在结构中柱由于具有较高的强度和良好的延性而作为竖向承力的主要构件,但在地震作用下,钢管混凝土柱可能发生端部钢管壁屈曲,管内混凝土被压碎而失去承载能力,造成整体结构的坍塌。为了更好地发挥钢管混凝土的性能,通过分析学者们的研究,探讨钢管混凝土柱的轴压性能、破坏模式以及局部屈曲对钢管混凝土结构性能的影响。因此,研究钢管混凝土柱的轴压性能及探寻合理的设计方法延缓钢管的局部屈曲,并且准确评估在大震响应下钢管混凝土柱的抗震性能显得尤为重要。

Concrete-filled steel tube is to point to in the steel tube filled concrete and the formation and steel tube and core concrete to withstand external loads of a combination structure.The seismic performance to a large extent depends on the strength and ductility of the column,the column in the structure with high strength and good ductility and as the main component of the vertical bearing capacity,but under the seismic action,the possible end of steel tube wall of concrete filled steel tube column buckling,concrete crushed and lose bearing capacity,caused the collapse of the whole structure.In order to give full play to the performance of concrete-filled steel tube(CFST),this paper discusses the failure mode of axial compressive performance of CFST columns and the influence of local buckling on the structural performance of CFST through analyzing the researches of scholars.Therefore,it is particularly important to study the axial compressive performance of concrete-filled steel tube column and to explore a reasonable design method to delay the local buckling of steel tube and to accurately evaluate the seismic performance of concrete-filled steel tube column in response to large earthquakes.