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高强钢耐火性差,在火灾高温作用下强度和刚度急剧降低。因此,近年来,高强钢结构抗火设计的理论得到了较深入的研究,通过对高强钢结构抗火性能方面研究成果的总结,包括:高强钢高温力学性能、高强钢焊接截面高温后残余应力、高强钢柱抗火性能研究、高强钢梁抗火性能研究、高强钢节点抗火性能研究、受火后高强钢结构抗火性能等,讨论高强钢结构抗火设计理论方面值得注意的若干问题。已有的研究成果表明:高强钢的材料力学性能和结构抗火性能不同于普通钢和普通钢结构,现行设计标准关于抗火设计的方法不能直接应用于高强钢结构。
High-strength steel fire resistance is poor, under the action of high temperature fire sharp decline in strength and stiffness. Therefore, in recent years, the theory of high-strength steel structure fire resistance design has been more in-depth study of high-strength steel structure of the fire resistance performance of the research results are summarized, including: high-strength steel high temperature mechanical properties of high-strength steel welding cross-section high temperature residual stress , Research on fire resistance of high strength steel columns, research on fire resistance of high strength steel beams, research on fire resistance of high strength steel joints, fire resistance of high strength steel structures after fire, etc. Some notable problems in fire resistance design of high strength steel structures are discussed. The existing research results show that the mechanical properties and structural fire resistance of high strength steel are different from ordinary steel and common steel structure. The current design standards on fire resistance design methods can not be directly applied to high strength steel structure.