四面受热时型钢混凝土柱的简化计算方法研究

高温作用下型钢混凝土柱的力学性能的有限元分析是进行其抗火性能设计研究的重要途径。基于型钢和混凝土材料在高温下的力学性能曲线,简化得到其计算模型,通过ABAQUS软件分析,研究了高温下型钢混凝土柱在不同时刻的温度场分布,根据分析得到的结果确定了柱截面等温曲线的位置,结合常温下型钢混凝土柱的计算公式对高温下的计算公式进行了研究,简化得到了高温下型钢混凝土柱极限承载力的计算公式,根据已有的试验资料对所推导型钢混凝土柱简化计算方法的正确性进行了分析,结果表明:利用文中简化的计算公式计算所得的型钢混凝土柱的弯矩值为865 kN,轴力值为132 kN·m,与其试验值具有一定的吻合度。

Simplified calculation method of steel reinforced concrete columns under high temperature on four surfaces

The finite element analysis of mechanics performance of steel reinforced concrete columns under high temperature is an important method for the research on fire resistance design.Based on the mechanical property curve of steel and concrete materials under high temperature,simplify the calculation model,Based on the test curve of steel and concrete under high temperature,the simplified model was obtained.The temperature field distribution of steel reinforced concrete columns in different times was analyzed by ABAQUS.According to the results of the analysis,combined with the calculation formula of steel concrete column in normal temperature,simplified calculation formula of high temperature were studied,and the formula of ultimate bearing capacity was obtained of steel reinforced concrete column under high temperature. The existing experimental data proved the correctness of the simplified calculation method of steel reinforced concrete column, providing theoretical basis for engineering design and application.The result showed：the moment of steel veinforcecl conovete column calculated by the formula was 865 kN,the exial force was 132 kN·m, they had a certain degree of agreement with the experimental value.