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对方钢管和钢管混凝土的局部屈曲进行研究,主要分析不同的深厚比对钢构件的影响。通过对24个深厚比数值为50~125的构件进行试验发现,混凝土的存在会影响已有的屈曲模式,并显著增加钢管混凝土的屈曲承载力。采用ABAQUS软件建立数值模型,并与试验结果进行有效对比。从设计角度来看,当构件深厚比高于50时,计算钢构件对钢管混凝土承载力贡献的同时应包含局部屈曲效应。例如,对深厚比超过120的细长板,其后屈曲效应能明显增加其承载能力,所以在计算钢构件对承载能力的贡献时应考虑这一效应。最后,提出计算包括短粗和细长钢结构复合截面的承载力计算公式,并通过了大量试验结果的验证。
The local buckling of the steel tube and the concrete filled steel tube is studied. The influence of different deep ratios on the steel members is mainly analyzed. Through the experiment of 24 members with deep ratio of 50 ~ 125, it is found that the existence of concrete will affect the existing buckling mode and significantly increase the buckling capacity of CFST. The numerical model was established by ABAQUS software and compared with the experimental results. From the design point of view, when the member depth ratio is higher than 50, the local buckling effect should be included in the calculation of the contribution of steel members to the bearing capacity of CFST. For example, for slender slabs with a depth ratio in excess of 120, the subsequent buckling effect can significantly increase their carrying capacity, so this effect should be taken into account in calculating the contribution of the steel member to the carrying capacity. Finally, the formula to calculate the bearing capacity of composite sections including short and thick steel structures is proposed and verified by a large number of test results.