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为提高钢筋混凝土异形柱的受力性能,在钢筋混凝土异形柱中设置钢管高强混凝土芯柱,形成内置钢管高强混凝土芯柱的组合异形柱。为研究该类型组合异形柱在历经高温后的受压性能,开展了3个足尺十字形组合异形柱试件在历经ISO 834标准明火试验后的轴压试验和1个未受火组合异形柱试件的轴压试验,分析了不同受火时间对内置钢管高强混凝土芯柱的组合异形柱的破坏形态、轴向变形和轴向承载能力的影响。结果表明:处于试件内部的芯柱承载力高且升温较慢,由芯柱所提供的轴向承载能力和竖向刚度受高温影响较小,受火时间为90 min和120 min异形柱试件的剩余承载力系数分别为0.839和0.761,具有较高的剩余轴压承载力。
In order to improve the performance of reinforced concrete special-shaped columns, special columns of high-strength concrete-filled steel tubular columns were set up in special-shaped reinforced concrete columns to form composite shaped columns with built-in high-strength concrete columns of steel-reinforced concrete. In order to study the compression performance of this type of shaped special-shaped column after high temperature, three full-scale cross-shaped special-shaped column specimens were tested under axial pressure after ISO 834 open flame test and one non- The axial compression tests of specimens were carried out to analyze the influence of different exposure time on the failure mode, axial deformation and axial load capacity of the special-shaped columns with built-in high-strength concrete-filled steel tubular columns. The results show that the core column in the specimen has high bearing capacity and slow temperature rise, the axial load capacity and vertical stiffness provided by the stem are less affected by the high temperature, and the exposure time is 90 min and 120 min. The remaining bearing capacity coefficient of 0.839 and 0.761, respectively, with a high residual axial compression capacity.