内置CFRP圆管的方钢管高强混凝土中长柱轴压性能试验

Experimental Study on Middle Long Columns of High Strength Concrete Filled Square Steel Tube with Inner CFRP Circular Tube under Axial Compressive Load

目的研究内置CFRP圆管的方钢管高强混凝土的可行性和必要性,并指出内置CFRP圆管的方钢管高强混凝土应用于建筑物的竖向承重构件中所具有的优越性.方法通过对7根内置CFRP圆管的方钢管高强混凝土柱和5根方钢管高强混凝土柱承载力的对比试验,探讨了在相同宽度厚度比的情况下,3种CFRP层数和5种长细比对内置CFRP圆管的方钢管高强混凝土柱承载力的影响.结果CFRP圆管对构件的承载力的有显著提高,内置一层CFRP管承载力增长5%左右,二层增加12%左右;随着长细比的增加,内置CFRP圆管的方钢管高强混凝土构件承载力有减小的趋势.结论通过对应变曲线的分析得出宽厚比和CFRP参数的最优组合为2层.

The feasibility and the necessity of high strength concrete filled square steel tube with inner CFRP circular tube are studied. The superiority of high strength concrete filled square steel tube with inner CFRP circular tube is presented, which is used in vertical load-bearing components in buildings. Based on the tests on 7 axial compressed high strength concrete filled square steel tube with inner CFRP circular tube and 5 axial compressed high strength concrete filled square steel tube, in the same width-thickness ratio, the influences of three kinds of CFRP layers and five slenderness ratios on bearing capacity are discussed. Through the analysis of the test curves, the calculation of bearing capacity is significantly improved. The experimental results show that when inner CFRP circular tube change from one layer to two layers, the increasing rates of the bearing capacity of the specimens are 5% and 12% accordingly. The bearing capacity of the specimens reduces with the increase of slenderness ratios. Based on the analysis of strain curves, the optimal combination of width-thickness ratio and the number of CFRP layers are two layers.