内置CFRP圆管的方钢管高强混凝土轴压短柱试验

目的研究内置CFRP圆管的方钢管高强混凝土轴压短柱的受力性能.方法对12根内置CFRP圆管的方钢管高强混凝土轴压短柱进行静力加载试验,通过绘制轴压短柱的荷载-应变曲线,对比了不同CFRP配置率的情况下,承载力的提高程度,并对这种新型组合结构进行了经济性能分析.结果内置CFRP圆管的方钢管高强混凝土轴压短柱的受力全过程分为5个阶段;试件承载力随CFRP与钢管配置率增加而增大;在相同承载力情况下,比方套圆中空夹层钢管混凝土柱的经济性能更为优越.另外,由于内置CFRP圆管有效地约束了核心混凝土,改善了方钢管的角部应力集中现象,3种材料能够较好地协同工作.结论这种新型组合结构充分发挥了3种材料的优点,可有效提高柱子承载力,为促进其在工程中的应用提供一定的理论依据.

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

Experimental results of 12 short columns are analyzed, which are the high-concrete filled square steel tube with inner CFRP circular tube under axial compressive load. The test phenomenon-failure modes and the load-strain curves of the short columns under axially compressing load is investigated. In different CFRP deployment ratio, the bearing capacity is variously improved. The economic performance of this new combinational structure is analyzed too. The whole force process of short columns is divided into five stages. The improvement of the bearing capacity of specimens is related to the change of the deployment ratio of the CFRP and the steel tube. With the same bearing capacity, this structure is better than the double-skin concrete-filled steel tubular short columns with square sections. According to the analysis of the combinational structure shown in this paper, we can see that the core concrete is effectively bounded by the inner CFRP circular tube, and the three materials work together well. The advantage of the three materials in the new combinational structure is fully exerted, and the bearing capacity of the columns is efficiently improved. This offers the theory basis for the design in the engineering.