关于预应力混凝土构件正截面承载力计算方法的讨论和建议

Discussion and Recommendation on Calculation Method of Normal Section Bearing Capacity for Prestressed Concrete Member

我国混凝土结构设计规范对截面受压区有预应力筋的正截面承载力计算公式的简化处理存在安全隐患。根据应变协调原则,提出了纯弯、压弯和拉弯三种受力模式通用的正截面承载力修正计算公式。利用纤维截面分析软件XTRACT验证了修正公式的正确性和计算精度。

There is a security risk in the simplified calculation formula of normal section bearing capacity of prestressed tendons in the section compressive zone in the concrete structure design codes of China Based on the principle of strain coordination,a universal modified calculation formula of normal section bearing capacity for three mechanical modes of pure bending compressive bending and tension bending is proposed.The analysis software XTRACT of fiber section is used to validate the correctness and calculation accuracy of the modified formula.