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在我国现行的GB 50017—2003《钢结构设计规范》中,采用换算截面法计算钢-混凝土组合梁的应力,由于没有考虑滑移效应的影响,计算结果与实测值有一定差距。在折减刚度法的基础上,推导了一种较简便的考虑滑移效应的组合梁弹性应力和屈服弯矩计算公式,并将所得的屈服弯矩与试验数据进行比较,发现公式的计算结果与试验数据吻合较好。根据刚度折减系数对组合梁截面屈服弯矩的影响,给出换算截面法和考虑滑移效应的组合梁截面屈服弯矩计算公式的适用范围。
In China’s current GB 50017-2003 Code for Design of Steel Structures, the stress of steel-concrete composite beams is calculated by using the converted section method. Since the effect of slip effect is not considered, there is a certain gap between the calculated results and the measured values. Based on the reduced stiffness method, a simple formula to calculate the elastic stress and yielding moment of composite beam considering the slip effect is deduced. The yield bending moment obtained is compared with the experimental data, and the calculation results of the formula Good agreement with the experimental data. According to the effect of stiffness reduction coefficient on the yield moment of section of composite beam, the applicable range of the formula for calculating the yield moment of section of composite beam considering the modified section method and slip effect is given.