Under the background of a long-span rigid-framed flexible CFST arch bridge, the catholicity method to compute the ultimate capacity is brought forward. 以某大跨度刚性梁柔性钢管硅拱桥为例，总结了具有较普遍意义的大跨度桥梁极限承载力计算方法。
Results show that in order to determine the ultimate load capacity of the derricks, both geometrical and material nonlinearities must be taken into consideration. 计算结果表明，只有采用几何和材料双重非线性的分析方法，才能准确评估井架的极限承载力。
