在钢管中充填高强高性能混凝土可形成钢管高强高性能混凝土组合结构，但研究表明要最大程度地发挥钢管混凝土结构的组合优势，单纯依靠提高管内混凝土的强度是不够的，还必须与之匹配地使用高强、高性能钢管。为适应我国节能环保发展战略，高强高性能混凝土得到大力推广，基于此，本项目提出了将高强钢管与目前最具发展前景的高强高性能混凝土—活性粉末混凝土（RPC）进行组合的研究思路。本项目以高强钢管—RPC组合结构的主要受力构件-组合柱为研究对象，进行组合柱轴心与偏心受压性能研究，同时开展高强钢管约束下RPC的本构模型研究，并在此基础上提出高强钢管RPC组合短柱及中长柱的极限承载力计算公式；其次，开展组合柱的滞回性能及恢复力模型研究，建立其恢复力模型；最终开展高强钢管与高强混凝土材料匹配关系和组合约束机理研究。研究可为钢管混凝土组合结构的发展注入新的生机与活力，开拓新的方向。

The high strength and high performance concrete filled steel tube is a kind of composite structure. However research results show that to maximize the combined advantage of the concrete filled steel tube structure，improving the strength of the concrete alone is not enough. It is required to use matching high-strength steel tube as well. Among the high strength and high performance concrete, reactive powder concrete (RPC) is the most promising at present. Therefore, it is proposed to conduct a research on composite structure of RPC filled high-strength steel tube and study on constitutive model of RPC for composite column under the restriction of high-strength steel tube. Research will be conducted on the performance of composite column under axial and eccentric load, and formulas will be proposed to calculate the ultimate bearing capacity for short and middle long composite column of RPC filled high-strength steel tube; study will be carried out on hysteretic behavior of composite column to establish the restoring force model. A final study will concentrate not only on matching relationship between high-strength steel tube and high performance concrete, but also on constraint mechanism of the combination. The research can inject new vigor and vitality into the development of CFST composite structure with a new direction.