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为提高钢筋混凝土十字形异形柱受力性能,在钢筋混凝土十字形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十字形组合异形柱结构。通过对2个足尺十字形组合异形柱试件在ISO 834标准升温过程下的明火耐火试验和1个组合异形柱试件在常温下的轴压性能试验,分析内置芯柱、箍筋间距对组合异形柱在高温下的破坏形态、轴向变形和耐火极限的影响规律。试验研究结果表明:处于试件内部的内置钢管高强混凝土芯柱对十字形异形柱的耐火极限有很大提高,而箍筋间距对组合异形柱的耐火极限影响不大。
In order to improve the performance of RC cross-shaped special-shaped columns, a CFST column was set up in the cross-shaped reinforced concrete column to form a cross-shaped composite column with a built-in high-strength concrete column. Through the fire resistance test of two full-scale cross-shaped special-shaped column specimens under the ISO 834 standard temperature-rising test and the axial compression performance test of a combination shaped-shaped specimen at room temperature, The effect of combination shape column on the failure morphology, axial deformation and fire resistance under high temperature. The experimental results show that the built-in steel-reinforced concrete (CFST) column has a great improvement on the fire resistance of the cross-shaped column, while the spacing of the stirrups has little effect on the fire resistance of the special-shaped column.