【摘要】 建造全尺寸穿斗式木构民居试验模型，通过现场火灾试验，研究该类建筑在火灾中的蔓延过程、构件破坏及温度变化特征。试验结果表明，各房间的火灾蔓延特征相似，先为热解气体蓄积，随后发生轰燃，最后火势随燃料的消耗而变弱；房间上部构件先于下部构件烧毁，构件截面尺寸越小，烧毁越严重；房间轰燃发生前，上部空间温度较高，但窗户、墙体等构件的损毁导致冷空气大量涌入，上部空间温度快速下降。热成像分析显示，阁楼板缝隙、墙板接缝是热解气体逸散通道，热解气体易在阁楼空间形成蓄积。更多还原

【Abstract】 A full-scale experimental model of a Chuandou-style timber house was constructed to investigate the fire spread process, structural damage, and temperature variation characteristics through on-site fire tests. The test results indicated that the fire spread characteristics in each room were similar, starting with the accumulation of pyrolysis gases, followed by a flashover, and finally, the fire weakened as the fuel was consumed. The upper structural components burned before the lower ones, and the smaller the cross-sectional size of the components, the more severe the burning. Before the flashover in the room, the temperature in the upper space was higher, but the destruction of components such as windows and walls led to a large influx of cold air, causing the temperature in the upper space to drop rapidly. In addition, thermal imaging analysis revealed that the gaps in the attic floor and the seams of the wall panels are channels for the escape of pyrolysis gases, which tend to accumulate in the attic space.更多还原