公路盖板涵洞混凝土火灾损伤特征分析

国道主干线南昌绕城公路乐化至温家圳段一盖板涵洞混凝土的火灾持续时间约10h．最高温度近1000℃．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．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．

Damage Feature Analysis of the Highway Culvert Concrete in Conflagration

Based upon the damage features of the highway culvert concrete in conflagration, we find that the confla-gration had lasted ten hours and its highest temperature exceeded 1000℃. Damage of the concrete was uneven.According to the colors and fractural features, the extent of their damage can be classified into four grades such as mild damage, moderately damage, serious damage and destruction. The extent can be used to identify the residual strength of the concrete after conflagration. Local damage characteristics of concrete can be influenced by such factors as the fire source, fuel supply, the terrain of the fire section, and ventilation in the conflagration.