山东建筑大学学报2017，Vol.32Issue(5)：421-425,441,6.DOI:10.12077/sdjz.2017.05.003
四边简支现浇混凝土空心楼盖火灾试验研究
Stady on test of fire resistance of simply supported on four sides of cast-in-place concrete hollow floor
摘要
Abstract
The cast-in-situ concrete hollow floor with large span,heavy load,large space,flat plate beam technology,has been applied to a number of major projects.The present stage for the research on fire behavior of cast-in-situ concrete hollow floor is still less,and it is particularly important in the fire temperature field distribution and the form of destruction.In this paper,four edges simply support full-scale in-situ concrete hollow floor in fire under the coupling action of load and fire is presented, and test slab's temperature field distribution,in-plane and out of plane deformation and destruction are analyzed.The results show that there is an obvious temperature gradient inside the test floor,the maximum temperature difference of the rib beam and cavity can reach 550℃and 660℃,causing the temperature stress,making the upper part of the plate to be pulled and appearing perpendicular cracks to the edge of the plate.Cavities can block the partial heat transfer in fire and reduce the temperature on the upper surface of the floor and the side of the rib beams.The maximum vertical displacement of the test plate is 72.5 mm,and the maximum horizontal displacement is 10 mm.Throughout the test, the floor has not been burned through and the deformation recovery ratio is up to 70%,showing better fire resistance ability.关键词
现浇混凝土空心楼盖/火灾试验/破坏形态/变形/温度场Key words
cast-in-situ concrete hollow floor/test of fire/failure mode/deformation/temperature分类
建筑与水利引用本文复制引用
吕俊利,仲崇强,赵考重,徐少华..四边简支现浇混凝土空心楼盖火灾试验研究[J].山东建筑大学学报,2017,32(5):421-425,441,6.基金项目
国家自然科学基金项目(51308328) （51308328）
山东建筑大学博士基金项目(XNBS1302) （XNBS1302）
