Structural Strength of Beam-to-CFT Connections with Vertical Diaphragm 

Journal of Korean Society of Steel Construction, Vol.29, No.3, pp.237-247, June, 2017

Authors: Kim, Kyungtae ･ Lee, Heon-Woo ･ Kim, Young-Ki ･ Kim, Taejin ･ Kim, Jong-Ho

Abstract:

This paper investigates structural characteristics of internal vertical diaphragm and its influence on the connection strength between concrete filled tubular(CFT) column and beam. CFT columns are hybrids that combine two materials in one member. They have the benefits of steel for high tensile strength and ductility and of concrete for high compressive strength and stiffness. Analytical method of the flexural strength of vertical diaphragm to account moment transfer between panel zones is presented using yield line theory. Connection design is verified by a set of monotonic tests and numerical analysis with different diaphragm thicknesses. Plastic zones of CFT flange was found and matched closely to FEM results. Both analytical and experimental results showed good agreement that vertical diaphragm effectively alleviates the stress and transfer the force.

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