COMPARISON OF AISC 360 – 16 AND EC4 FOR THE PREDICTION OF COMPOSITE COLUMN CAPACITY

Abstract

Composite constructions are used widely in civil engineering structures. The steel and concrete act together to resist the loads. Composite columns are a significant application of composite construction, and the ConcreteFilled Steel Tube (CFST) columns are the most common type of composite columns. The CFST columns have been increasingly used all over the world due to their inherent advantages, and in particular because of their favorable behavior under seismic loads. The steel tube effectively confines the concrete core, providing a highly ductile response under compression and a high energy absorption capacity. This type of composite column has been used primarily in bridges, reservoirs, and tall buildings. Circular CFST column provides much more effective confinement to the core concrete than other types of column sections under axial load due to an enhancement of composite action between steel tube and core concrete. Many design specifications used to predict the capacity of CFST columns, the ANSI/AISC 360 – 16 and the Eurocode 4 (EC4). The ANSI/AISC 360 – 16 is the specification for steel structures in the United States; the Eurocode 4 is the European code for composite structure design, respectively. The objective of this study is to investigate the differences between the AISC 360-16 and the EC4 approaches of circular CFST columns under axial load and to evaluate how well they model the actual column behavior through a series of statistical comparisons. Also, the parameters which are used in design specification calculations steps will be assessed. The important parameters in calculations will also be specified to underline the best way in the design field

Keywords

• Composite columns,CFST column,Axial capacity,ANSI/AISC 360 – 16,EC4

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