某钢结构工程火灾后的检测鉴定

Detection and Evaluation on Steel Structure After Fire

通过工程实例讨论了火灾后钢结构的检测鉴定方法。介绍了火灾温度的估计方法,火灾对钢材性能、结构构件的影响,以及火灾对高强螺栓性能的影响。结果表明,现场检测可以根据钢材表面特征定性判断材料强度损失,但要精确估计火灾后钢材的残余强度宜进行材料试验。另外,高强螺栓连接性能应引起评估人员关注。检测试验结果及安全性评估结论可供类似工程参考。

This paper mainly discussed detection method of fired steel structure through real example of project.Introduced estimation methods of fire temperature,influence of steel capability and structural components,as well as the capability of high-strength bolts after fire.Test results show that existing calculation methods can not be used to estimate the residual strength of steel after fire exactly.Even though the strength loss can be judged through the appearance of the steel after fire, it is the best way to estimate the strength of steel after fire by test.Besides,behavior of high-strength bolts must be taken into account in the judgment on steel structures after fire.