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根据《组合楼板设计与施工规范》(CECS 273:2010)简化了闭口型组合楼板混凝土内部温度分布,编制了闭口型压型钢板-混凝土组合楼板耐火承载力有限元计算程序。基于程序计算结果进行了大量数据分析,基于混凝土受弯构件的承载力理论,回归得到了耐火极限分别为1.5h和2.0h的闭口型压型钢板组合楼板耐火承载力简化公式。运用简化公式进行了算例分析,比较了温度场分布、边界及是否考虑压型钢板作用对正弯矩区配筋量的影响,供设计人员参考使用。由于被混凝土包裹的压型钢板温度场分布研究尚不充分,故分别给出了考虑和不考虑压型钢板作用这两种情况下的正弯矩承载力简化公式。
According to the Code for Design and Construction of Composite Floors (CECS 273: 2010), the temperature distribution inside closed concrete floor slab is simplified, and the finite element program of fireproof bearing capacity of closed composite steel-concrete composite slab is developed. Based on the results of the program, a large amount of data were analyzed. Based on the bearing capacity theory of concrete flexural members, the simplified formula of fire-resistant bearing capacity of closed-floor profiled slab with fire-resistant limit of 1.5h and 2.0h respectively was obtained. The simplified formulas were used to analyze the case study. The influences of temperature field distribution, boundary and the effect of profiled steel plate on the amount of reinforcement in positive bending moment area were compared for designers’ reference. Since the distribution of temperature field of the profiled steel sheet wrapped by concrete is not sufficient, the simplified formula of bearing capacity of positive moment is given respectively in two cases with and without considering the effect of profiled steel plate.