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１４ＭｎＮｂ＿ｑ钢是焊接桥梁结构用新型材料，本文根据断裂试验的结果，进行了数据的回归统计分析，建立了该钢的平面应力断裂韧性（Ｋｃ）与温度（Ｔ），板厚（ｔ）和转变特征温度（ｖＴｒＥ）等影响因素之间的统计关系。采用该统计关系式并结合断裂力学ｋ概念的工程处理方法，可以确定１４ＭｎＮｂ＿ｑ钢用于桥梁结构的不同构件类别，在不同设计温度下的板厚限定条件。文末，给出了合理应用１４ＭｎＮｂ＿ｑ钢的计算实例。
14MnNb_q steel is a new type of material for welded bridges. Based on the results of the fracture test, the regression analysis of the data is carried out. The results show that the plane stress fracture toughness (Kc), temperature (T), thickness (t) The characteristic temperature (vTrE) and other influencing factors. Using this statistical relationship and the engineering treatment concept of fracture mechanics k, it is possible to determine the condition of plate thickness for 14MnNb_q steel used in different component types of bridge structure at different design temperatures. At the end of the article, a calculation example of rational application of 14MnNb_q steel is given.