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根据实验结果,假设钢管和核心混凝土皆为理想的弹性塑性体材料,分析了三种可能的极限状态。同时按照实验结果,考虑到钢材和核心混凝土在弹性转入塑性状态的过程中,泊桑比μ_g及μ_h的渐变规律,论证了第二种极限状态,即钢管先于混凝土转入塑性阶段是唯一可能的极限状态。最后采用最大剪应力理论导出极限承载力的设计公式并制定图表,供设计时采用。按推荐的设计公式计算的钢管混凝土轴心受压构件的强度承载力,和过去的大量实验结果很吻合。
According to the experimental results, assuming that the steel tube and the core concrete are all ideal elastic plastic materials, three possible limit states are analyzed. At the same time, in accordance with the experimental results, taking into account the gradual variation of the Poisson’s ratio μ_g and μ_h during the process of elastic transfer of steel and core concrete into the plastic state, the second limit state was demonstrated, that is, the steel pipe was the only one before the transfer of concrete to the plastic stage. Possible limit state. Finally, the maximum shear stress theory is used to derive the design formulae for the ultimate bearing capacity and to formulate charts for use during design. The strength bearing capacity of axial-loaded concrete-filled steel tubular members calculated according to the recommended design formula is in good agreement with the results of a large number of experiments in the past.