建筑结构学报2024，Vol.45Issue(3)：52-59,100,9.DOI:10.14006/j.jzjgxb.2023.0428
正交胶合木-混凝土组合楼板单面受火耐火极限试验研究
Experimental study on fire endurance of CLT-concrete composite slabs exposed to one-side fire
摘要
Abstract
To investigate the fire endurance of CLT-concrete composite slabs in fire,four CLT-concrete composite slab specimens and two CLT slab control specimens were designed and tested at normal temperature and in fire,respectively.Numerical simulation of the specimens was also conducted.The test results indicate that the failure modes of the CLT slab specimen at normal temperature basically include tensile failure along the grain of the bottom dimension lumbers,transverse grain splitting failure between the two adjacent layers of dimension lumbers,and rolling shear failure of the middle dimension lumbers.The failure modes of CLT-concrete composite slab specimen at normal temperature include shear failure at the interface between the cast-in-place concrete layer and the CLT panel,and tensile fracture failure of the bottom dimension lumbers along the grain.The initial stiffness and bending capacity of the CLT-concrete composite slab specimen at normal temperature are 237.8％and 60.1％higher than those of the CLT slab specimen.After being exposed to fire,there are obvious charring layers in the CLT panels,and the composite slab specimens have obvious bending deformations.Under the same load ratio,the fire endurance of the CLT-concrete composite slab specimen is 335.3％higher than that of the CLT slab specimen.With the load ratio increasing from 0.20 to 0.50,the fire endurance decreases from 74.1min to 30.6 min.The finite element model provides good prediction accuracy for the fire endurance of the CLT-concrete composite slab specimens,and the modelling errors are within 14.1％,which can satisfy the engineering accuracy requirements.关键词
正交胶合木-混凝土组合楼板/荷载比/单面受火试验/数值模拟/耐火极限Key words
CLT-concrete composite slab/load ratio/one-side fire test/numerical simulation/fire endurance分类
建筑与水利引用本文复制引用
冷予冰,王明谦,许清风,陈玲珠,郭雪媛,陈溪..正交胶合木-混凝土组合楼板单面受火耐火极限试验研究[J].建筑结构学报,2024,45(3):52-59,100,9.基金项目
国家自然科学基金面上项目(51978402),上海市优秀技术带头人计划(22XD1432100),上海市自然科学基金项目(23ZR1454400). （51978402）
