（1 湖北工程学院土木工程学院， 孝感 432000； 2 武汉大学土木建筑工程学院， 武汉 430072）

［摘要］钢管RPC结构是一种承载力极高延性优良的新型结构，钢管对RPC的约束效果与普通钢管混凝土有差别。为建立适合于钢管RPC短柱轴压承载力计算公式，收集相关文献数据，基于极限平衡理论选用不同的核心RPC约束强度准则对钢管RPC短柱轴压承载力进行了计算分析。结果表明：极限平衡理论可用于钢管RPC短柱轴压承载力计算，但其计算精度依赖于RPC常规三轴强度屈服准则；钢管对RPC的强度约束效果相比普通混凝土弱，现阶段采用极限平衡理论求解钢管RPC短柱轴压承载力时，建议核心RPC采用k=3的线模型屈服准则，而高围压的核心RPC屈服准则还有待进一步的研究与探讨。研究成果可为钢管RPC柱的工程设计和相关规范修订提供理论依据。

［关键词］极限平衡理论； 钢管RPC短柱； 约束强度准则； 轴压承载力

中图分类号：TU375-3文献标识码：A文章编号：1002-848X(2020)05-0135-05

Analysis of axial compressive bearing capacity for RPC filled steel stub columns based on the limit equilibrium theory

Yan Yanxiang1, Li Biao2, Tong Youzhi1, Li Xiaomu1, Liu Jinjun1

(1 School of Civil Engineering， Hubei Engineering University， Xiaogan 432000, China；2 School of Civil ＆ Architecture Engineering， Wuhan University, Wuhan 430072, China)

Abstract:Reactive powder concrete（RPC）filled steel tube structure is a new structure with extremely high bearing capacity and excellent ductility. The confinement effect of steel tube on RPC is different from ordinary concrete. In order to establish the calculation formula for the axial bearing capacity of RPC filled steel stub columns, the relevant literature data was collected for formula verification, and the strength of RPC filled steel stub columns under axial compression was analyzed according to the limit equilibrium theory of concrete filled steel tube and different  constraint strength criteria of core RPC. The results show that the limit equilibrium theory can be used to calculate the axial bearing capacity of RPC filled steel stub columns, but its computational accuracy depends on the conventional tri-axial strength yield criterion of RPC. The constraint strength of steel tube on RPC is weaker than that of ordinary concrete. At the present stage, when the limit equilibrium theory is used to calculate the axial bearing capacity of RPC filled steel stub columns, it is suggested that the line model yield criterion of k=3 is adopt for the core RPC, and further research and discussion is needed for the yield criterion of core RPC with high confining pressure. The research results can provide references for engineering design and theoretical support for specifications revision of RPC filled steel stub columns.

Keywords:limit equilibrium theory; RPC filled steel stub column; constraint strength criterion; axial bearing capacity

*孝感市自然科学计划项目（XGKJ2019010049），湖北省教育厅科学技术研究项目（Q20182706）。

作者简介：颜燕祥，博士研究生，讲师，Email：yyxtm@163.com。