轴向压缩下圆形和多边形钢管混凝土柱的统一公式

目前,不同截面钢管混凝土(CFST)柱的轴向承载力采用不同的公式计算。研究人员和设计师试图在柱的设计中找到一个适用于不同截面(包括实心、空心、圆形和多边形截面)的统一公式,这一直是他们面临的一个挑战,事实上也是十分重要的问题。为满足现代的设计要求,结构在材料的使用、结构构件的拓扑学方面不断优化,上述问题应运而生。作者之前研究了圆形空心和实心CFST柱轴向承载力的统一公式,该文将其拓展到正多边形截面空心和实心CFST柱,将圆形截面作为多边形边数为1的特殊情况。最后,给出用于计算圆形或多边形截面实心和空心钢管混凝土柱轴向承载力的统一公式。此外,对空心圆形和方形钢管混凝土柱进行了试验。这些试验结果对有限的公开发表的文献进行了补充,也验证了该分析公式。

A Unified Formulation for Circle and Polygon Concrete-Filled Steel Tube Columns Under Axial Compression

Current design practice of concrete-filled steel tube ( CFST ) columns uses different formulas for different section profiles to predict the axial load bearing capacity.It has always been a challenge and practically important issuefor researchers and design engineers who want to find a unified formula that can be used in the design of the columns with various sections , including solid , hollow , circular and polygonal sections.This has been driven by modern design requirements for continuous optimization of structures in terms of not only the use of materials , but also the topology of structural components.This paper extends the authors ’ previous work on a unified formulation of the axial load bearing capacity for circular hollow and solid CFST columns to , now , including hollow and solid CFST columns with regular polygonal sections.This is done by taking a circular section as a special case of a polygonal one.Finally , a unified formula is proposed for calculating the axial load bearing capacity of solid and hollow CFST columns with either circular or polygonal sections.In addition , laboratory tests on hollow circular and square CFST long columns are reported.These results are useful addition to the very limited open literature on testing these columns , and are also as a part of the validation process of the proposed analytical formulas.