内置CFRP圆管的方钢管高强混凝土长柱轴压性能试验

为了研究内置碳纤维复合材料（CFRP）圆管的方钢管高强混凝土长柱的力学性能，对4根内置CFRP圆管的方钢管高强混凝土柱和4根方钢管高强混凝土柱进行了承载力对比试验研究，绘制了荷载一变形曲线，并对内置CFRP圆管的方钢管高强混凝土轴压长柱的力学性能进行了全过程分析。结果表明：在含钢率相同的条件下，随着长宽比的增大，相同CFRP层数的方钢管高强混凝土柱承载力有所降低；随着CFRP层数的增加，在长宽比相同的情况下，方钢管高强混凝土柱承载力有显著提高；对核心混凝土的约束效应增加，延缓了构件的屈服时间；CFRP层数对试件的承载力影响更为显著。

Experiment on Performance of High-strength Concrete-filled Square Steel Tube Long Columns with Inner CFRP Circular Tube Under Axial Compression

In order to study the performance of columns of high-strength concrete-filled square steel tubes with inner carbon fiber reinforced polymer （CFRP） circular tube, the contrast tests of bearing capacities of 4 columns of high-strength concrete-filled square steel tubes with inner CFRP circular tube, and 4 columns of high-strength concrete-filled square steel tubes were made. Curves on the relationship of stress-strain were drawn. The whole process analysis on the performance of columns of high-strength concrete-filled square steel tubes was carried out. The results show that under the same steel ratio, the bearing capacity of high-strength concrete-filled square steel tube column with the same number of CFRP layers decreases when slenderness ratio increases. Under the same slenderness ratio, with increase of the number of CFRP layers, the bearing capacity of high-strength concrete-filled square steel tube column is obviously improved, the confining effect on the core concrete is better and the yield time of structural member is prolonged.