王力尚  钱稼茹     （清华大学土木工程系  北京 100084）

[提要] 22根钢管高强混凝土柱的轴向受压试验结果表明，钢管高强混凝土短柱的轴向受压破坏为剪切破坏，长柱的破坏为弯曲破坏。根据试验和有关文献的结果，提出了混凝土强度等级不大于C80、套箍指标不大于1.1的钢管高强混凝土柱的轴向受压承载力计算公式，以及长柱轴向受压承载力折减系数计算公式。
[关键词]  钢管高强混凝土柱 轴向受压  承载力折减系数  套箍指标

Experimental study on 22 steel tube confined high-strength concrete columns was carried out under the axial compressive load. The test results showed that the short columns failed due to shear failure of core concrete, the long columns failed due to flexure. Based on the test results of this study and others, a formula for calculating the axial compressive strength of short steel tube confined high-strength concrete columns,as well as the strength reduction factor for long columns are proposed. The formula and the factor are suitable for the grade of core concrete not larger than C80 and the steel tube confinement index not larger than l.1.
Keywords:  steel tube confined high-strength concrete column; axial compression; strength reduction factor; steel tube confinement index