余勇  吕西林    （同济大学工程结构研究所 上海 200092）   

    Tanaka Kiyoshi   Sasaki Satoshi   （日本藤田公司技术研究所）

 

[提要]  利用三维非线性有限元方法编制的计算机程序，对试验结果进行了分析、比较，并探讨了方钢管混凝土截面受力机理和破坏机制。对截面尺寸和材料强度在较大范围内变化的方钢管混凝土短柱进行了模拟试验，通过参数分析、回归得到方钢管混凝土短柱的承载力计算公式。
[关键词]  方钢管混凝土 三维非线性分析 承载力公式

The companion paper has presented the experimental results of concrete-filled rectangular tubular(CFRT) short columns under concentric loading and investigated the main factors which affected the behavior of CFRT columns. This paper presents the development of a 3D nonlinear F.E. analysis computer program whose accuracy is verified by comparing the analysis results to data from tests of Tonui and the authors, and the load-carrying and failure mechanism of CFST cross section are investigated. A capacity formulation of CFRT short columns having a wide range of cross-section dimensions and material strengths is proposed based on experiment simulation, parameter analysis and regression analysis.
Keywords: concrete-filled rectangular steel tube; 3D nonlinear analysis; capacity formulation