内置CFRP圆管的方钢管混凝土中长柱偏压试验

Experiment on Eccentrically Compression of Middle Long Columns of Concrete-filled Square Steel Tube with Inner CFRP Circular Tube

通过对10根内置碳纤维复合材料(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的承载力进行对比试验,分析了CFRP含量、偏心距和长细比等参数对试件性能的影响。结果表明:在长细比相同的条件下,随着偏心距的增大,相同CFRP含量的方钢管高强混凝土柱承载力降低;在长细比和偏心距相同的情况下,随着CFRP含量的增加,方钢管高强混凝土柱承载力有显著提高,对核心混凝土约束效应增加,增强了构件的延性;随着长细比的增大,相同CFRP含量和相同偏心距的方钢管高强混凝土柱承载力降低。试验结果为进一步分析和推导承载力公式打下了基础。

Upon the contrast test of bearing capacities of ten columns of high-strength concrete-filled square steel tubes with inner carbon fiber reinforced polymer （CFRP） circular tube and four columns of high-strength concrete-filled square steel tubes, the influences of different parameters on the performance of test specimens were studied, from the analysis of test curves. The conclusion can be drawn that under the precondition of same slenderness ratio, the eccentricity increases, and the bearing capacity of column of high-strength concrete-filled square steel tube with the same content of CFRP reduces. Under the precondition of the same eccentricity and the same slenderness ratio, the content of CFRP increases, and the bearing capacity of the column of high-strength concrete-filled square steel tube obviously increases. The restraint effect on the core concrete increases, the yield time of structural member is prolonged. Under the precondition of the same eccentricity and the same content of CFRP, the slenderness ratio increases, and the bearing capacity of the column of high-strength concrete-filled square steel tube obviously reduces. The test results make good preparations for further formula derivation and research.