木-钢梁板组合结构耐火性能研究  

Research on Fire Resistance of Wood-Steel Beam Plate Combination Structure

作　　者：刘永军[1] 庄喜弘 郭世庆 LIU Yongjun;ZHUANG Xihong;GUO Shiqing(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第4期633-641,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：“十三五”国家重点研发计划项目(2018YFD1100403)。

摘　　要：目的提出一种木-钢梁板组合结构,通过木梁包裹薄镀锌钢板和两层木质楼板夹薄钢板的方式,提高木梁和木质楼板的承载力和耐火极限时间,解决传统木梁楼板结构在发生火灾后短时间内容易烧毁、倒塌的问题。方法参照实际木楼,按1∶1的缩尺比例在试验炉左右两边布置2种不同的梁板组合结构,在相同持荷水平及相同火荷载条件下进行受火对比试验;通过在木梁和楼板中布置热电偶的方法测量并分析各测点的温度变化,用卷尺测量木梁和楼板的炭化深度研究木-钢组合梁板的强度。结果在相同的火源条件下,新型木-钢梁板组合结构耐火时间相较于传统木质梁板结构至少提高了30 min;薄钢板阻碍了火源热量向木结构辐射,使木梁的炭化深度平均减少了2.5 cm,木板炭化深度平均减少了1.6 cm。结论在相同荷载条件和火源条件下,木-钢梁板组合结构拥有更好的耐火性能和支撑能力。A combined wood-steel beam-slab structure is proposed to improve the load-bearing capacity and fire resistance limit time of wood beams and wood floor slabs by wrapping thin galvanised steel plates around wood beams and sandwiching thin steel plates between two layers of wood floor slabs,solving the problem that traditional wood beam-slab structures tend to burn and collapse within a short time after a fire.Two different combinations of beams and slabs were arranged on the left and right sides of the furnace at a scale of 1∶1 in reference to the actual timber building and subjected to comparative fire tests at the same load-holding level and under the same fire load conditions;the temperature changes at each measurement point were measured and analysed by means of thermocouples arranged in the timber beams and slabs,and the charring depth of the timber beams and slabs was measured with a tape measure to study the strength of the timber-steel combination.Under the same fire conditions,the fire resistance time of the new wood-steel beam-slab combination structure is increased by at least 30 min compared to the traditional wood beam-slab structure;the thin steel plate hinders the radiation of heat from the fire source to the wood structure,which reduces the charring depth of the wood beam by an average of 2.5 cm and the charring depth of the wood slab by an average of 1.6 cm.The combined timber-steel beam-slab structure has better fire resistance and support capacity under the same load conditions and fire source.

关 键 词：木结构 火灾试验 耐火极限 抗火设计 炭化深度 

分 类 号：TU398.1[建筑科学—结构工程]