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提出了一个新的钢筋混凝土矩形构件在双向弯矩和扭矩共同作用下的极限分析方法。首先根据构件所受到的外力确定构件破坏时的破坏翘曲面,其次通过分析得到破坏翘曲面上的应力分布,最后利用平衡方程得到双向弯扭作用下的强度计算公式。根据极限分析原理,提出的方法为一个偏于安全的下限解,得到的结果应比实际破坏荷载偏小。该方法计算简单,与现有试验结果符合较好,可进一步推广到更复杂的受力情况。
A new limit analysis method for the RC rectangular member under the action of two-way bending moment and torque is proposed. Firstly, the damage warpage surface is determined according to the external force applied to the component. Secondly, the stress distribution on the damaged warpage surface is obtained through analysis. Finally, the formula for calculating the strength under two-way bending and torsion is obtained by using the balance equation. According to the principle of limit analysis, the proposed method is a biased lower bound solution, and the result should be smaller than the actual failure load. The method is simple in calculation and in good agreement with the existing test results, which can be further extended to more complex stress situations.