（长安大学建筑工程学院  西安  710061）

［提要］  采用双剪统一强度理论，对CFRP-钢管混凝土轴压短柱进行研究，分析了核心混凝土内摩擦角、中间主应力、钢管厚径比和CFRP粘贴层数对极限承载力的影响，提出了CFRP-钢管混凝土轴压短柱的极限承载力公式。并将理论计算结果与文献资料的试验结果作比较，验证了理论公式的正确性。进一步简化了理论公式，在没有外CFRP筒，且k=4，b=0时，理论公式退化为圆截面钢管混凝土轴压短柱承载力极限平衡法的表达式。该结果为CFRP-钢管混凝土轴压短柱的极限承载力分析提供了一定的理论依据，供工程设计参考。

［关键词］  CFRP-钢管混凝土柱  双剪统一强度理论  薄壁钢管  极限承载力

Mechanics Behavior of Concrete Filled CFRP-steel Tube Stub Columns Under Axial Compression/Authors:Zhang Changguang,Zhao Junhai,Feng Hongbo (School of Civil Engineering, Chang′an University, Xi′an 710061, China)

Abstract:The load bearing capacities of concrete filled CFRP-steel tube stub column under axial loads are investigated. The effects of inner friction angle of the concrete, the intermediate principal stress, the ratio of the thickness and the diameter, and the layer number of the CFRP are  considered in the theoretic analysis. The formula of load capacities for the column is derived based on the twin shear  strength theory. Good agreement can be found between the results of the analysis and the experimental data. By assuming  k=4 and b=0, the formula can be simplified for cases without CFRP.

Keywords:concrete filled CFRP-steel tube column； unified twin shear strength theory;  steel tube; ultimate bearing capacity

*教育部博士点基金资助项目(20040710001);陕西省自然科学基金资助项目(2005E204)。