Behaviour and design of high strength steel-concrete filled columns

![CDATA[This paper considers the behaviour and design of high strength steel-concrete composite columns used in major infrastructure engineering systems. The paper will highlight the major applications where high strength steel has been used in Australia and internationally. Current codes of practice will then be considered, highlighting the latest developments in Australian and International Standards for the use of high strength steel and high strength concrete in composite structural forms of construction. This paper also presents the results of an experimental study of the use of high strength steel-concrete composite columns which evaluates the in-plane residual stresses. This study uses high strength steel with nominal yield stress of 690 MPa coupled with high strength concrete of characteristic compressive strength of 100 MPa. The concrete used in this study adopts a reduction of 30% of the use of cement content by using high volume fly ash. The use of both of these high strength materials satisfies the Green Building Council of Australia objectives to reduce materials and the impact of construction materials on carbon emissions. This paper focuses on a number of the technical aspects which the combination of these two materials allows. The improved local buckling resistance of the use of steel in contact with concrete is taken into account. Furthermore, the effect of increased confining effect due to the larger elastic range of steel is also considered.]]