Abstract: Abstract: The steel structure has been widely used in the construction industry in our country, but poor fire resistance has been an extremely important factor affecting the development of steel structures. At present, there exist no technical standard of steel structures identification after fire disaster. Along with the growing number of fire disaster and the disputes between the parties becoming serious, the steel structure damage assessment technology after fire disaster becomes a new issue of the construction engineering forensic sciences. The determination of the temperature in the fire disaster, the techniques of member damage identification, the strength of component reduction as well as connectivity performance of node changes is the main content of the steel security identification after fire .Several projects were applied in this article in order to discuss the steel structure damage identifies and the safety assessment after fire disaster, which can be offered to related personnel as a reference.

摘要： 摘要：钢结构已广泛应用于我国的建筑行业，但耐火性能差一直是影响钢结构发展的重要因素。目前，国家尚无专门针对钢结构的火灾鉴定标准。随着钢结构火灾事故不断增多、当事人各方利益纠纷严重，火灾后钢结构损伤评定技术逐渐成为建筑工程司法鉴定行业的新兴课题。火场温度的判定、构件损伤识别技术、构件强度折减以及节点连接性能变化是火灾后钢结构安全性鉴定的主要内容。文章结合工程案例，对火灾后钢结构损伤识别、安全性评估等技术问题进行探讨，可供相关从业人员参考。

关键词: 关键词：安全鉴定, 火灾, 钢结构, 损伤评定, Keywords: safety appraisal, fire disaster, steel structure, damage assessment