CONNECTION BETWEEN CONCRETE-CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMN AND STEEL BEAM REINFORCED WITH INTERNAL DIAPHRAGM

摘要

It is necessary to predict the tensile elasto-plastic behavior of inner-diaphragm-type and through-diaphragm-type connections between steel beams and concrete-filled square steel tubular columns. This paper proposes a new analytical method for predicting the load-deformation relation of such connections. This method was developed by superposing the load-deformation relations of a tube and a diaphragm. The tube flange was modeled as a grid beam with a tetra-linear load-deformation relation, while the tube web and diaphragm were modeled as tensile members with a tri-linear load-deformation relation. These analytical methods were found in agreement with experimental results up to large deformation.