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进行了2块四边简支钢筋混凝土双向板足尺试件在恒载-升温工况下的火灾试验。研究了双向板在受火过程中沿板厚混凝土的温度场分布规律、钢筋的温度变化、板平面内外的变形、板边转角随温度的改变情况。试验结果表明,在荷载和温度的耦合作用下,沿板厚存在非线性温度场,板平面外变形比常温下显著增加;四边简支钢筋混凝土双向板具有与常温下不同的破坏模式,裂缝主要出现在板顶的长边跨中、距短边支座1/4处以及角部;在火灾作用下板的荷载传递路径有明显改变。
The fire tests of two four-sided simply supported two-way slab reinforced concrete specimens under constant load and heating conditions were carried out. The distribution of temperature field, the temperature change of steel bar, the deformation inside and outside the slab and the change of the slab angle with temperature were studied. The experimental results show that under the coupling of load and temperature, there exists a nonlinear temperature field along the plate thickness, and the out-of-plane deformation significantly increases at room temperature. The four-sided simply supported reinforced concrete two-way slab has different failure modes at room temperature, Appeared in the long side of the board at the top of the span, away from the short side support 1/4 and the corner; under the action of the fire plate load transfer path has changed significantly.