建筑结构学报2017，Vol.38Issue(4)：70-80,11.DOI:10.14006/j.jzjgxb.2017.04.009
薄壁钢梁-陶粒混凝土装配式组合楼板受火后受力性能研究
Post-fire mechanical property of thin-walled steel beam-ceramsite concrete assembled composite floors
摘要
Abstract
The new assembled composite slabs formed with thin-walled steel beam and eeramsite concretes have the advantages of lighter weight,higher strength and being convenient for construction.To study the fire-resistance performance and post-fire mechanical property of the slabs,experimental study of the post-fire mechanical performance of six simply-supported composite slabs after exposure to hydrocarbon fire heating with maximum temperature of 700 ℃ and duration time of 90 min was conducted.The results show that the overall collapse of the composite slabs will not take place even when there are serious torsion of thin-walled steel beam and more than one serious crack in the concrete,and the maximum deflection of the slabs is less than L/400 for bearing uniform load of 2 kN/m2;The ultimate load of the composite slab specimens after fire for which the commonly used nails are set is 14.2％ greater than that with the shear keys made with thin-walled steel plate;As for the composite slab specimens in which there are more main beams for the constant steel quantity,the ultimate load of the composite slab specimens after fire for which the U-type steel ties are used as pull pieces is 33％ higher than that of the specimen in which U-type tie bars are used,and the global stiffness of the composite slabs has the similar results.It is concluded that the composite slabs after exposure to fire still have higher bearing capacity and global stiffness,and type of the shearing keys,pull pieces between the precast concrete panels and the connection way of shearing keys to pull pieces have great effect on the post-fire mechanical property of the composite slabs.It can be seen that the combined effect coefficient presented here can be used to properly reflect the combined effect of the concrete panels and thin-walled steel beams and the damage degree of the slabs.关键词
装配式组合楼板/轻质预制板/冷弯薄壁钢梁/高温试验/静力试验/受火后受力性能/组合效应Key words
assembled composite floor/lightweight precast panel/cold-formed thin-walled steel beam/fire test/static test/post-fire mechanical property/combined effect分类
建筑与水利引用本文复制引用
王新堂,任鹏飞,王万祯..薄壁钢梁-陶粒混凝土装配式组合楼板受火后受力性能研究[J].建筑结构学报,2017,38(4):70-80,11.基金项目
国家自然科学基金项目(51687312,51278254). （51687312,51278254）
