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为研究混凝土板在面内约束作用下的火灾行为,对1块面内约束混凝土双向板进行了恒载-升温条件下的火灾试验,获得了试验板沿板厚的温度场分布、钢筋温度、板挠度和平面外变形以及板角约束力等规律。基于EC2和ASCE两本构模型,采用五种理论对四块不同面内约束作用下试验板的极限承载力进行对比分析。结果表明:单向面内约束作用时,试验板板顶出现沿约束力方向的平行裂缝;与挠度相比,板在垂直约束力方向的平面内膨胀变形较大且不可忽略;面内约束作用和破坏准则对火灾下混凝土双向板极限承载力有重要影响。
In order to study the fire behavior of concrete slab under in-plane restraint, a two-way slab with in-plane confined concrete was subjected to a fire test under constant load-temperature condition. The temperature field distribution along the slab thickness, Plate deflection and out of plane deformation and angle of restraint and other rules. Based on the two constitutive models of EC2 and ASCE, five kinds of theories are used to compare and analyze the ultimate bearing capacity of the test plates under four different in-plane restraints. The results show that when the unidirectional in-plane restraint is applied, parallel cracks appear along the binding force in the top of the test plate. Compared with the deflection, the plate in the vertical restraint direction has large deformation and can not be neglected. The in-plane restraint And failure criterion have an important influence on the ultimate bearing capacity of two-way slab under fire.