【摘要】 铜-黄公路涵洞衬砌混凝土的火灾持续时间约9h,最高温度超过1 000℃。衬砌混凝土的损伤是不均匀的,根据残留受火混凝土的颜色、裂隙发育特征及疏松程度,将其损伤程度划分为轻度损伤、中等损伤、严重损伤和破坏4个等级,依此判别其残余强度。衬砌混凝土的局部损伤特征受火灾发生时的火源、燃料供给、受火区段的地形、通风等因素的影响。更多还原

【Abstract】 Based upon the damage features of the lining concrete of a culvert in Tong-Huang highway after conflagration,it is concluded that the conflagration had lasted about nine hours and its highest temperature exceeded(1 000℃).The lining concrete endured damage in varying degrees,which are ranked into four types,i.e.gently damaged,moderately damaged,seriously damaged and thoroughly damaged,according to their colors and fractural features.The damage degree can be used to identify the residual strength of the concrete after conflagration.It is concluded that the damage features of the lining concrete are related to fire source,fuel supplying mode,landscape and ventilation condition of the conflagration.更多还原