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给出计算不同截面轴心受压实心和空心钢管混凝土(CFST)柱抗火性能的新方法,包括圆形和多边形截面。新方法的特点是,基于柱截面的平均温度进行抗火性计算。研究火灾下CFST柱的承载力时,选取室温下CFST柱的承载力作为对照。对与钢材和混凝土平均温度相关的等效强度和等效弹性模量进行了研究,并给出计算的标准方法。将CFST抗火性计算分为以下两个步骤:1)基于平均温度计算高温下钢材和混凝土的等效强度和弹性模量;2)将高温下材料等效强度和弹性模量代入室温公式进行抗火性计算。基于标准方法、欧洲规范EC4和作者的前期工作给出计算CFST柱抗火性的两组公式。将建议公式计算结果与一些圆形或方形截面实心和空心CFST柱的试验结果进行对比,验证了建议公式的有效性。
A new method for calculating the fire resistance of CFST columns with different axial sections under different axial sections is given, including circular and polygonal sections. The new method is characterized by fire resistance calculation based on the average column cross-section temperature. To study the bearing capacity of CFST column under fire, the bearing capacity of CFST column at room temperature was chosen as the control. The equivalent strength and equivalent modulus of elasticity related to the average temperature of steel and concrete were studied and the standard method of calculation was given. CFST fire resistance calculation is divided into the following two steps: 1) Calculate the equivalent strength and elastic modulus of steel and concrete under high temperature based on the average temperature; 2) Substitute the equivalent strength and elastic modulus of materials under high temperature into the room temperature formula Fire resistance calculation. Based on the standard method, two sets of formulas for calculating the fire resistance of a CFST column are given in the previous work of European Specification EC4 and the author. The proposed formula is compared with the experimental results of some solid or hollow CFST columns with round or square cross-sections, and the validity of the proposed formula is verified.