火灾后型钢混凝土十字形柱的敏感性分析

Sensitivity analysis of steel reinforced concrete cross-shaped column after fire

为准确分析型钢混凝土柱的抗火灾行为,采用Abaqus软件对型钢混凝土十字形柱进行顺序热力耦合分析,将十字形柱的截面温度分布、温度-时间关系、火灾后的破坏模式以及载荷-位移关系的模拟结果与试验结果进行对比,验证有限元模型的有效性。讨论十字形柱模型的参数敏感性,选择最优混凝土材料属性、建模单元和材料的热膨胀系数,为型钢混凝土组合结构模拟提供更精确的参考依据。

To accurately analyze the fire resistance behavior of steel reinforced concrete columns, the sequential thermal mechanical coupling analysis of steel reinforced concrete cross-shaped columns is carried out using Abaqus software. The simulation results of the temperature distribution, the temperature-time relationship, the failure mode after fire and the load displacement relationship of the cross-shaped columns are compared with the experimental results to verify the effectiveness of the finite element model. The parameter sensitivity of cross-shaped column model is discussed, and the optimal concrete material properties, the modeling elements and the thermal expansion coefficient of materials are selected. It provides a more accurate reference for the simulation of steel reinforced composite structure.