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本文根据塑性增量理论的Prandtl-Reuss理论,推导出可供实用的钢管混凝土应力分析方法。该方法分别考虑了加载与卸载,及材料处于塑性段与强化段等情况。与以往研究中所用的塑性全量理论方法相比,它能更准确地对钢管混凝土应力状态作出定量分析。用本文提出的方法对钢管混凝土试件进行了分析,并据之计算钢管混凝土构件的极限承载力,其结果与极限平衡法得到的结果相吻合。
Based on the Prandtl-Reuss theory of plasticity increment theory, this paper derives practical methods for stress analysis of concrete filled steel tubes. This method considers loading and unloading separately, and the material is in the plastic section and the reinforced section. Compared with the plastic total quantity theory used in previous studies, it can more accurately quantitatively analyze the stress state of concrete filled steel tubes. With the method proposed in this paper, the concrete-filled steel tube specimens were analyzed, and the ultimate bearing capacity of the concrete-filled steel tube members was calculated. The results are consistent with the results obtained by the limit equilibrium method.