中文摘要：

由薄壁钢桁架和轻骨料混凝土构成的新型组合楼板,具有轻质、高强和施工便捷等优点,可广泛用于住宅钢结构楼盖及各种施工平台等。对承载条件下的5块简支组合楼板试件开展了烃类火灾作用下的试验研究,得到了它们的火灾热响应及位移响应。试验结果表明,承载2 k N/m^2的组合楼板试件,在最高炉温为650℃的烃类火灾作用下,当响应位移达到L/26、且试件已出现多处裂缝时,组合楼板试件仍保持良好的整体性。对试验结果的分析表明,对于所采用的新型抗剪键,I型预制板及抗剪键分布的抗火性能明显优于II型预制板及其相应的抗剪键分布。钢桁架梁斜腹杆的壁厚对于组合楼板的火灾后残余位移有明显影响（当腹杆壁厚增加60%时,残余位移降低56%）。因此从减小组合楼板火灾后残余变形的角度出发,宜适当加大钢桁架腹杆壁厚。

英文摘要：

The new composite slabs formed with thin-walled steel trusses and lightweight aggregate concretes has the advantages of lighter weight, higher strength and being convenient for construction. The slabs may be widely used for the floors of steel structure residence and the variety of construction platforms. The thermal response and displacement response of five simply supported composite slabs under static load were obtained through fire experiment under hydrocarbon fire. The experimental results show that the composite slabs bearing the equivalent uniform load of 2 kN/m2 still keep better entirety when the fire response displacement of the slab specimen is up to L/26 under the hydrocarbon fire with maximum temperature of 650~C and there are more than one crack on the concrete panel. It is seen from the experimental results that the fire-resistance performance of the composite slabs with Type I pre- cast panel and the related distribution of the shear keys presented here is better than that with Type II precast pan- els and the corresponding distribution of the shear keys. It is shown that thickness of steel plate used for diagonal web member of the thin-walled steel truss beams has obvious effect on the residual displacement of compesite slabs after fire （ the residual displacement reduced 56% of response displacement for 60% increment of thickness ）. Therefore, the thickness of steel plate used for web member should be increased for reducing the post fire residual displacement of the composite slabs.