Stiffness Calculation Method of Concrete Filled Steel Tubular Structure

Abstract:

Concrete filled steel tubular is a steel-concrete composite material. Its stiffness is reasonable or not will affect the accuracy of the internal force and deformation. Based on the two mixed material stiffness calculation theory that superposition theory and unified theory, a conversion stiffness formula list recommended by domestic and international codes and researchers was derived. By matlab program, the ratio between combination stiffness and conversion stiffness was calculated, and the relation curves between the stiffness ratio and parameters including steel grade, concrete grade and steel ratio were obtained. A conclusion is drawn: for the concrete filled steel tubular structure, we can calculate the conversion stiffness first, then by the combination stiffness and conversion stiffness ratio, so as to obtain the combination stiffness. In practical engineering applications, the combination stiffness is more in line with the mechanical characteristic of the composite structure, and the calculation results are more closer to the actual situation.

• Periodical: Applied Mechanics and Materials (Volumes 253-255)
• Pages: 330-334
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.253-255.330
• Online since: December 2012
• Authors: Shu Fen Zhou, Xian Wu Hao, Zi Qing Li
• Keywords: Combination Stiffness, Composite Structure, Concrete Filled Steel Tubular (CFST), Conversion Stiffness, Stiffness Theory

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DOI: 10.3403/00073298u

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