型钢混凝土约束柱耐火极限实用计算方法

Fire resistance practical calculation methods of restrained steel reinforced concrete columns

利用ABAQUS有限元软件,建立了热力耦合作用下四面受火型钢混凝土约束柱的数值分析模型,该模型得到了已有试验数据的验证。应用上述模型,详细考察了轴向约束刚度比、转动约束刚度比、荷载比、偏心率、截面尺寸、含钢率、截面配筋率等参数对型钢混凝土约束柱耐火极限的影响规律。对影响型钢混凝土约束柱耐火极限的各种参数进行详细计算分析,结果表明轴向约束刚度比、荷载比、偏心率、截面尺寸和混凝土强度是影响耐火极限的主要因素。通过大量计算给出了型钢混凝土约束柱耐火极限的实用抗火计算方法。

Using ABAQUS finite element software,the theoretical calculation model of restrained steel reinforced concrete columns subjected to fire from four sides under the coupling effects between temperature and load was proposed.The model was validated by the existing test data.Using the model,axial restraint stiffness ratio,rotational restraint stiffness ratio,load ratio and eccentricity ratio,sectional dimension,steel ratio,reinforcement ratio and other parameters were considered to get the influence law of fire resistance on steel reinforced concrete columns.Through detailed calculation and analysis of various parameters of fire resistance on restrained SRC columns,the results showed that the axial restraint stiffness ratio,load ratio,eccentricity,section size and strength of concrete are the main factors influencing the fire resistance of restrained columns.On the basis of a lot of calculation of restrained SRC columns,apractical method was given to calculate the fire resistance of restrained SRC columns.