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本文依据混凝土的应力应变关系曲线,对全截面受压的偏心受压构件,用平衡条件建立了有关刚度的基本表达式;同时,对不同配筋率、不同偏心距的偏压试验构件,采用较准确的全过程分析方法,补充了“计算模型试验”数据,从而对各荷载阶段的刚度变化规律,进行了深入的了解和研究。在此基础上拟合了有关偏压刚度的实用曲线和表达式,可供参考使用。
Based on the stress-strain curve of concrete, this paper establishes the basic expression of the relative stiffness for an eccentric compression member subjected to full section compression. At the same time, it adopts the biased test components with different reinforcement ratios and eccentricities. The more accurate whole-process analysis method is supplemented with the data of “Computational Model Tests”, so as to make an in-depth understanding and study of the law of stiffness variation in each load stage. On this basis, practical curves and expressions related to bias stiffness are fitted for reference.