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在分析国外桥规中防断选材规则的基础上，提出了将１６Ｍｎｑ钢用于焊接桥梁时的韧性要求，纳入焊接桥梁防断设计的完整体系加以考察，采用了断裂力学Ｋ概念的基本思路。根据深缺口宽板拉伸试验，夏比Ｖ型缺口冲击试验得到的１６Ｍｎｑ钢大量试验结果，进行了规律性的统计分析，给出了１６Ｍｎｑ钢及其焊接接头的断裂抗力表达式；根据设计规范和钢桥典型结构件的内应力分析，规定了焊接桥梁各类构件的驱动力分类。提出了１６Ｍｎｑ钢按韧性分级使用的建议，最终给出了对应于构件类别、最低设计温度所允许使用的１６Ｍｎｑ钢各韧性级别的极限厚度表。文末，以１６Ｍｎｑ钢韧性分级使用为共同基础，将本研究工作的最终结果分别与执行英国桥规和其它实用性防断判据所得结果进行对比。本文的结论意见既包括了纳规建议，又涉及了关于后续工作建议。
On the basis of analyzing the rules of anti-cutting material selection in foreign bridge regulations, the paper put forward the requirement of toughness when using 16Mnq steel for welding bridges, including the complete system of anti-fracture design of welded bridges, and adopted the basic idea of K concept of fracture mechanics. According to the results of a large number of tests on 16Mnq steel obtained from Charpy V-notch impact test, the regular statistical analysis is given, and the fracture resistance of 16Mnq steel and its welded joints is given. According to the design specifications And steel bridge structural stress analysis of the typical components of the bridge provides a variety of components driving force classification. Proposed 16Mnq steels grading the use of recommendations, and finally given the corresponding type of components, the minimum design temperature allows the use of 16Mnq steel limit of the thickness of the table thickness limit. At the end of this paper, the 16Mnq steel toughness grading was used as a common basis, and the final results of this study were compared with the results obtained from the implementation of UK bridge gauge and other practical proof criteria. The concluding comments of this article include not only the proposed Nazarbadam, but also the suggestions for follow-up work.