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国内外大量实验现象表明,钢筋混凝土梁在受到弯矩和剪力共同作用的情况下,其抗弯承载力和抗剪承载力具有相关性。GB50010-2002《混凝土结构设计规范》(以下简称“规范”)关于梁的设计方法并未考虑两者的相关性。分析表明:在弯剪共同作用下,按《规范》设计的钢筋混凝土梁的可靠指标不能满足GB50068-2001《建筑结构可靠度设计统一标准》的要求。通过对现有试验数据进行分析,该文提出了基于四分之一圆弧模型的建议修正公式和相应的计算方法。修正公式能很好的体现梁抗弯承载力和抗剪承载力之间的相关性,具有明确的物理意义。对修正公式和《规范》公式进行配筋计算和可靠度分析,结果表明:考虑弯剪相关性的修正公式相比《规范》公式,计算模式准确,可靠指标接近《统一标准》的要求。
A large number of experiments both at home and abroad show that the flexural capacity and shear capacity of reinforced concrete beams are correlated under the combined action of bending moment and shear force. GB50010-2002 Code for Design of Concrete Structures (hereinafter referred to as “Code”) The design method of beams does not consider the correlation between the two. The analysis shows that under the joint action of bending and shearing, the reliable index of reinforced concrete beams designed according to “norms” can not meet the requirements of GB50068-2001 “uniform standard of reliability design of building structures”. Based on the analysis of the existing experimental data, this paper proposes a modified formula based on the quarter arc model and the corresponding calculation method. The correction formula can well reflect the correlation between beam bending capacity and shear capacity, and has clear physical meaning. The results of the reinforcement calculation and the reliability analysis of the correction formula and the standard formula show that the correction formula considering the relationship between bending and shear is close to the requirement of “uniform standard” compared with the “standard” formula and the calculation model is accurate and reliable.