The axial compression test was carried out on the aluminum foam-filled steel tube specimens after experiencing the different high temperatures action. According to the compression test, the failure mode of the composite specimen after different temperatures was progressive folding deformation, and the axial force–displacement curve was obtained. With the increase in load and deformation, aluminum foam-filled steel tube members have experienced a repeated process of yield, local buckling of members, and compaction of steel tube and aluminum foam, which shows the fluctuation of bearing capacity in the compression force–displacement curve. The fire resistance strength and axial deformation of metal foam-filled steel tube members under axial compression were calculated by using the nonlinear finite element method of thermal-force coupling constitutive relationship. Those results derived from the simulation were compared with the experimental results. Based on the verified numerical simulation method, it is determined that the axial compression failure mechanism of composite members after different high temperatures is dominated by steady-state compression. After the aluminum foam is filled with the empty steel tube, the energy absorption capacity of this member in the axial compression process has been improved. The influence of relevant parameters including temperature, aluminum foam density, thickness of steel tube, and section length-to-width ratio on the fire resistance strength and failure mode of the foam-filled steel pipe members was analyzed. The results show that with the increase in the fire temperature, the peak bearing capacity of composite members under axial compression decreases to a certain extent. With the increase in density of aluminum foam, the load of yield platform and the difference between upper and lower limits of yield platform increase. The ultimate bearing capacity of composite members has been further improved as the thickness of steel pipe increases. Compared with the rectangular section, the upper limit of yield platform for the members with square section is further improved.

对泡沫铝填充钢管试件进行不同高温作用后的轴向压缩试验。根据压缩试验，复合试件在不同温度后的破坏模式为渐进折叠变形，得到轴向力-位移曲线。随着载荷和变形的增加，泡沫铝填充钢管构件经历了反复屈服、构件局部屈曲、钢管与泡沫铝压实的过程，表现为压缩力-位移承载力的波动。曲线。采用热力耦合本构关系的非线性有限元方法计算了泡沫金属填充钢管构件在轴向受压下的耐火强度和轴向变形。将这些模拟结果与实验结果进行比较。基于经过验证的数值模拟方法，确定复合构件在不同高温后的轴向压缩破坏机制以稳态压缩为主。泡沫铝填充空钢管后，提高了该构件在轴压过程中的吸能能力。相关参数的影响包括温度、泡沫铝密度、钢管厚度、分析了截面长宽比对泡沫钢管构件耐火强度和破坏模式的影响。结果表明，随着火灾温度的升高，复合构件在轴向受压下的峰值承载力有一定程度的降低。随着泡沫铝密度的增加，屈服平台的载荷和屈服平台上下限的差值增大。随着钢管厚度的增加，复合构件的极限承载力进一步提高。与矩形截面相比，进一步提高了方形截面构件的屈服平台上限。复合构件在轴向受压下的峰值承载力有一定程度的降低。随着泡沫铝密度的增加，屈服平台的载荷和屈服平台上下限的差值增大。随着钢管厚度的增加，复合构件的极限承载力进一步提高。与矩形截面相比，进一步提高了方形截面构件的屈服平台上限。复合构件在轴向受压下的峰值承载力有一定程度的降低。随着泡沫铝密度的增加，屈服平台的载荷和屈服平台上下限的差值增大。随着钢管厚度的增加，复合构件的极限承载力进一步提高。与矩形截面相比，进一步提高了方形截面构件的屈服平台上限。