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本文对钢管混凝土偏心受压构件的稳定问题,提出应采用压溃理论来确定这种构件的临界力比较合理。把钢材和核心混凝土均简化成理想弹性塑性体,不考虑紧箍力的有利影响,应用耶硕克近似的分析法,按临界状态时杆件中载面可能出观的三种应力分布情况分别推导了临界力的理论计算式。通过实验验证,并用国内外近百个试件的实验值加以校核。证明所提的计算式除λ<50且e/r≤0.15范围以内的柱偏于保守外,其他工程中常用的柱,计算具有足够的准确性。利用本文计算式可以针对不同情况编制出计算图表,工程应用也很方便。
In this paper, the stability problem of the eccentric compression member of concrete-filled steel tube (CFST) is proposed. It is proposed that the crushing theory should be used to determine the critical force of such a member. The steel and core concrete are simplified into ideal elastic plastic bodies, regardless of the favorable influence of the tight hoop force. With Jeskop’s approximate analysis method, the three stress distributions on the bearing surface in the rod member at the critical state can be observed separately. Derived the theoretical calculation of critical force. Through experimental verification, and using the experimental values of nearly one hundred specimens at home and abroad for verification. It is proved that the calculated equations except the λ<50 and the e/r≤0.15 range are conservative, and the columns commonly used in other projects are calculated with sufficient accuracy. Using the formulas in this paper, calculation charts can be compiled for different situations, and engineering applications are also very convenient.