These recommendations,together with further research work,have been used in Eurocode 4,which deal with composite construction in buildings. If all the geometrical and physical non-linearities of the different materials are observed,it is possible to meet the code requirements using numerical methods of analysis. The most comprehensive method is the Eurocode 4 approach,followed by the AISC-LRFD approach. An Australian approach incorporating AS 3600 and AS4100
These recommendations, together with further research work, have been used in Eurocode 4, which deal with composite construction in buildings. If all the geometrical and physical non-linearities of the different materials are observed, it is possible to meet the code requirements using numerical methods of analysis. The most comprehensive method is the Eurocode 4 approach, followed by the AISC-LRFD approach. An Australian approach incorporating AS 3600 and AS 4100
Advantages: Small cross-sections; .Sections with different resistances,but identical external dimensions,can be produced by varying steel thickness,concrete strength and additional reinforcement. Economic efficiency: .With concrete filled profiles,the steel section serves as formwork during casting. The complete encasement of the steel section by concrete be able to fulfil the technical requirements for high classes of fire protection
Advantages: Small cross-sections; Sections with different resistances, but identical external dimensions, can be produced by varying steel thickness, concrete strength and additional reinforcement. Economic efficiency: With concrete filled profiles, the steel section serves as formwork during casting. The complete encasement of the steel section by concrete be able to fulfil the technical requirements for high classes of fire protection
7.2 Types of cross-section for composite columns The sections can be classified into two groups: 1 Totally and partly encased sections Concrete filled sections Types of cross- sections for composite columns
7.2 Types of cross-section for composite columns The sections can be classified into two groups: Totally and partly encased sections Concrete filled sections Types of crosssections for composite columns
Composite or hybrid system (concrete steel) System which combines the advantages of concrete and structural steel Concrete Structural steel Rigid Economic High strength Ductile Fire resistant Durable Easy to assemble Fast to erect Frames with CFT columns Steel tube confines concrete Concrete restricts the local buckling of the steel tube Increase in strength deformation of the concrete Delay in the global buckling of the steel tube Frames with SRC columns Steel element supports the construction loads The concrete gives final stiffness and fire resistant Shear connections become FR once concrete is cast System fast to erect build Redundancy robustness
Configurations for Composite Columns a)SRC b)Circular and Rectangular CFT c)Combinations betweenSRC and CFT