中文摘要：

由薄壁钢桁架和轻骨料混凝土构成的新型叠合板具有轻质、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,因此对该叠合板的受力性能及火灾行为的研究具有重要的理论意义和工程应用价值。对受火后的5块叠合板试件开展了火灾后受力性能试验研究与分析。结果表明,当叠合板遭受600℃的烃类火灾作用后,仍具有较强的变形能力,当火灾后继续承载的两边简支叠合板累积位移达到L/58时,叠合板试件仍未发生整体坍塌。结果还显示,轻骨料混凝土预制板类型及相应的抗剪键分布形式对于该叠合板的火灾后整体刚度及承载能力均产生显著影响,且本试验所采用的Ⅰ型预制板及相应的抗剪键分布优于Ⅱ型预制板及相应的抗剪键分布。所给出的叠合板跨中挠度计算公式引入了组合效应系数,该系数可以综合反映混凝土板与钢桁架梁的组合效应,且所表征的受力特征与试验结果完全一致。

英文摘要：

The new laminated slabs formed with thin- walled steel trusses and lightweight aggregate concretes have 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. Therefore, It is of the im- portant theory significance and engineering application value to study its bearing behavior and fire - resistance per- formance. Experimental study of the post - fire mechanical performance of five laminated slab specimen after expo- sure to fire was conducted. Results showed that, under hydrocarbon fire with temperature of 600~C, the overall col- lapse of the laminated slabs did not occur when the maximum cumulative displacement of the slab specimen was up to L/58 under uniform static load. It was seen from the experimental results that, the type of lightweight aggregate precast panels and the related distribution of the shear keys obviously affected the post - fire stiffness and bearing capacity of the laminated slabs. The type I precast panels used in this test and the corresponding distribution of the shear keys presented here were better than the Type II precast panels and the related distribution of the shear keys.The computational formula of the middle span deflection of the slab introduced a combined - effect coefficient, by which the combined effect of concrete panel and steel truss beam could be considered well and the results reflected by it coincided well with that of experiments.