Abstract:
Abstract: The steel concrete composites namely concrete filled steel tubular columns (CFST) and
encased steel reinforced concrete (SRC) columns are becoming increasingly popular in the building
industry due to the features like high strength, stiffness, fire resistance and constructability. Steel
jacketing is a useful technique available for the strengthening of existing reinforced concrete columns
to withstand additional loads applied from alteration such as addition of stories in existing buildings.
Recent revolution in the design and application of these steel-concrete composites provides numerous
advantages such like reduction in the sizes of vertical element, facilitate columns with higher
slenderness, enhancing capacity of existing columns to meet the increased demands, minimize the cost
involved for the fire protection and increase the construction speed.
The application of design methods available in the codes, detailing of connections and construction
techniques are some of the vital challenges for the designers as well as the contractors. This paper
intended summarize the basic aspects to be considered in the design of a CFST column, design
provisions given in EN 1994-1-1:2004, its practical application, detailing of composite columns and their
connections and constructability aspects. Further, the design and construction methods of steel jacketing
technique for the strengthening of existing columns will be discussed. The case studies selected from
the projects involved by the Authors will be included to demonstrate applications of for CFST and steel
jacketing in the building construction. Finally, based on the literature review conducted
recommendation is made for further studies in areas requires lack of reference in the design and
application of CFST.
