某地下钢筋混凝土通道火灾后结构检测分析

A Detection Analysis of Some Underground Reinforced Concrete Channel after Fire

以受火灾影响的某地下钢筋混凝土通道为对象,研究火灾后该通道的结构状况。推断火场温度、通道顶板、侧墙的损伤等级和混凝土损伤鉴定,以及受损后结构的简化计算分析等工作。得出:通道构件表面在火灾中最高温度达到300℃;混凝土损伤深度较大;迎火面混凝土强度影响较大,受力钢筋强度未受影响;相对于原结构,受损后通道关键部位的应力显著增大。

Based on some underground reinforced concrete tunnel influenced by fire, the tunnel structure condition after the fire is researched in this paper. Several key points are studied, including fire temperature inference, damage degrees of tunnel roof and side walls, concrete damage identification and simplified calculation analysis of damaged structure, etc. The results show that the highest surface temperature of tunnel component has reached 300℃; the concrete damaged depth is larger; the strength of concrete exposed to fire is influenced strongly and the strength of load-bearing bar is uninfluenced; compared with the original structure, the stress of key parts on the tunnel is significantly increased after the fire.