中文摘要：

进行了一块四边简支与一块四边固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。介绍了试件的设计、试验方案以及观测内容和方法。主要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以及固支板支座反力随火灾作用的变化。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，固支板的支座反力有显著的重分布，板的面外变形比常温下显著增加；四边简支与四边固支钢筋混凝土双向板具有与常温下不同的破坏模式，四边简支板破坏主要出现在长向跨中以及吊装阶段配置在板顶的负弯矩钢筋截断处；四边固支板在板顶出现椭圆型盆状塑性铰线。

英文摘要：

One four-edge simply supported slab and one four-edge fixed full scale reinforced concrete slab under the combined effects of static loading and fire were investigated. The specimen design, test plan, content and method were introduced. The tests mainly studied the distribution of temperature along the depth of the slabs, the temperature variation of the steel reinforcement, the out-plane and in-plane deformation, the rotation of the edges and the variation of bearing＇ reaction forces of the four-edge fixed slab. The experiments indicated that, under the combined effects of static loading an S d fire, the temperature along the depth of the slab is nonlinearly distributed, and the redistribution of the reaction forces was significant on the bearings of the four-edge fixed slab. Moreover, the out-plane deformation of the slabs was much larger than that of the slabs under normal temperature. The failure patterns of the four-edge simply supported and four-edge fixed slabs are different from those under normal temperature. For the four-edge simply supported slab, the failure of the slab mainly occurred in the middle of the long span and the breakage of the steel bar on the top of the slab for hoisting, while for the four-edge fixed slab, plastic hinge lines of elliptic shape appeared on the top of the slab.