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在很多结构中,钢管混凝土(CFTs)被作为柱使用。在钢管混凝土中,核心混凝土可阻止钢管内部发生屈曲变形,但是钢管约束水平、强度和延性的降低仍受外部局部屈曲的影响。为了克服钢管混凝土的这种缺陷,可以通过外包碳纤维增强材料来抑制外部局部屈曲变形。研究循环轴压荷载下受FRP约束的钢管混凝土柱的性能和建模过程。介绍并讨论两组圆钢管混凝土循环轴压荷载试验的试验结果。提出一个圆钢管混凝土中约束混凝土的循环应力-应变模型,且与试验结果较为一致。所提出的应力-应变模型可以在以后的研究中用来建立地震荷载作用下圆钢管混凝土模型。
In many structures, concrete-filled steel tubes (CFTs) are used as columns. In concrete filled steel tube, core concrete can prevent buckling deformation of steel tube, but the restraint level, strength and ductility of steel tube are still affected by external local buckling. In order to overcome this shortcoming of CFST, external local buckling deformation can be restrained by outsourcing carbon fiber reinforced materials. The behavior and modeling process of CFST columns subjected to cyclic compression under axial load were studied. This paper introduces and discusses the test results of two axial load tests on CFST under axial load. A cyclic stress-strain model of the confined concrete in CFST is proposed, which is in good agreement with the experimental results. The proposed stress-strain model can be used to establish a CFST model under seismic loading in later studies.