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在我国钢筋混凝土设计规范中,对细长的轴心受压构件的纵向弯曲系数是根据试验得出的经验公式确定的。在本文中,根据理论分析并参考试验资料,提出了一个简单的近似公式。对细长的偏心受压构件,我国和苏联规范都是根据弹性理论的挠度公式导出的偏心距增大系数η来考虑纵向弯曲影响,只是对临界荷载的计算引入从试验中得出的修正系数。在本文中,建议直接改用极限荷载下的挠度f_D来计算,并提出两个计算方案。通过约170根柱的试验结果的计算比较,表明建议方法符合程度较现行规范方法为好,此外还具有一些明显的优点。
In the design specifications of reinforced concrete in China, the longitudinal bending coefficient of the slender axial compression member is determined based on empirical formulas derived from the test. In this paper, based on theoretical analysis and reference to experimental data, a simple approximate formula is proposed. For slender eccentric compression members, both China and the Soviet Union’s specifications consider the effect of longitudinal bending based on the eccentricity increase coefficient η derived from the deflection formula of the elasticity theory, except that the calculation of the critical load introduces the correction coefficient derived from the test. . In this paper, it is proposed to directly use the deflection f_D under the ultimate load to calculate and propose two calculation schemes. The comparison of the experimental results of about 170 columns shows that the proposed method is better than the current normative method, and it also has some obvious advantages.