A Simplified Method for Concrete-Filled Steel Tube Column Analysis

Abstract:

To construct a finite element model of concrete-filled steel tube column which is suitable to practical engineering analysis, a double-beam (DB) element is proposed. The element is made up of two coinciding beams which simulate steel tube and kernel concrete respectively. The parameters analysis results show that a concrete-filled steel tube column should be divided into four or more DB elements to make the error of fundmental frequency less than 5%. Moreover, based on design codes of the concrete structures and steel-concrete mixed structure of tall buildings, a simplified constitutive model of kernel concrete is developed to consider the confinement effects of steel tube on the concrete. The results of numerical example show that the P-△ curve based on the simplified model is consistent with the experimental results, but the ultimate bearing capacity is less than experimental results. Therefore, the model has a reasonable reliability and can be a reference for similar engineering design analysis.

• Periodical: Advanced Materials Research (Volumes 368-373)
• Pages: 537-541
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.368-373.537
• Online since: October 2011
• Authors: Dan Guang Pan, Zheng Li, Jin Peng Tan, Hong Chun Gao
• Keywords: Concrete-Filled Steel Tube (CFST), Confinement Effect, Constitutive Model, Finite Element, Meshing Size

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