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中文摘要：
采用三参数统一强度理论，以空心圆钢管混凝土短柱为基础进行极限承载力分析，将混凝土划分为有效约束区和非有效约束区，通过均匀约束系数和侧压系数来反映截面形状及围压对极限承载力的影响，提出了适用于各种多边形截面形式空心钢管混凝土短柱的轴压极限承载力的统一解，变换参数可自然退化为实心和两参数统一强度理论的解，通过与文献试验结果的比较验证了其正确性，并分析了参数影响特性。研究结果表明：钢管混凝土短柱的轴压极限承载力随侧压系数的增大而增大；随均匀约束系数的增大而增大；随空心率的增大而减小。
英文摘要：
Based on three-parameter unified strength theory, the ultimate bearing capacity of hollow round concrete-filled steel tubular stub columns was analyzed.The core-concrete was divided into effective constraint region and non-effective confinement region.Through reflecting the cross section shape and confining pressure on the influence of the ultimate bearing capacity by uniform restraint coefficient and lateral pressure coefficient,a unified ultimate bearing capacity solution for polygon hollow concrete-filled steel tubular stub columns under axial compression is proposed, it can be degenerated into the solution of the solid cross-section and the two-parameter unified strength theory.Verified the correctness by comparison with literature test results, the influencing factors of formula is also discussed.The results show that the ultimate bearing capacity of concrete filled steel tube stub colunms under axial compression increases with increasing of lateral pressure coefficient and uniform restraint coefficient and decreasing of hollow ratio.
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