基于Timoshenko弹性稳定理论,本文分别提出了正交异性钢箱梁刚性加劲临界刚度比估算公式。建立7个数值模型,计算发现本文所提的估算公式偏于安全;同时比较分析发现,陈绍蕃教授的建议公式和Chai H.Yoo数值回归公式计算值则较为接近,Giencke.E公式的计算值最接近刚性加劲临界刚度比但略为偏小,并详细分析了本文公式与Giencke.E公式的适用范围。 Based on Timoshenko’s theory of elastic stability, the formulas for calculating the critical stiffness ratio of rigid stiffened steel box girder are proposed in this paper. The establishment of seven numerical models shows that the estimation formula proposed in this paper is biased towards safety. Meanwhile, the comparative analysis shows that the proposed formula of Professor Chen Shao-fan is close to the calculated value of the Chai H.Yoo numerical regression formula, and the calculated value of the Giencke.E formula Which is the closest to the critical stiffness ratio of rigid stiffeners but slightly smaller than that of the Giencke.E formula.