钢管混凝土研究与应用中的若干关键问题

Several Key Issues for the Research and Application of Concrete-Filled Steel Tubes

在钢管中填充混凝土形成钢管混凝土组合构件 ,受力过程中 ,混凝土可以有效地避免或延缓钢管发生局部屈曲 ,使构件的承载力和延性大为提高 ,从而使钢管混凝土和钢结构及混凝土结构相比具有一系列优点。组成钢管混凝土的钢管及其核心混凝土之间的相互作用是研究该类结构的关键。本文简要地回顾了钢管混凝土力学性能研究现状 ,论述了钢管及其混凝土之间的组合作用问题。最后 ,对需要进一步开展的研究工作 ,例如钢管混凝土施工力学、混凝土质量控制、钢材残余应力的影响、徐变和疲劳等若干问题进行了探讨。

Concrete-filled steel tubular columns have better structural performance than that of bare steel of bare concrete.Concrete eliminates or delays the local buckling of steel hollow sections,and increases significantly the strength and the ductility of the section.The interaction between steel thbe and concrete is the key issue to understand the behavior of concrete-filled tubular members.The state of the art of concrete-filled steel tubes is presented generally in this paper The general response of concrete-filled steel tubular columns is discussed with an emphasis on the composite action between the steel tube and its concrete core.Finally,the need for further research,such as behavior of concrete filled steel tubular structures during construction,concrete quality control,steel residual stress effects,creep and fatigue is identified.